Top SitesYour GTM & Analytics — always working. Always accurate. | Piotr Litwa

Machine Readiness

Stored receipt and evidence

Overall

30

Readable

100

Callable

0

Commerce

0

Payment

0

Machine Access

Inspect the site's MCP endpoint

Open MCP explorer

DialtoneApp can scan the stored discovery files for this domain, try the MCP initialize handshake, and show the raw protocol transcript.

Purchase boundary

read only

Control boundary

unknown

Payment rails

None

Payment providers

None

Payment methods

None

Payment protocols

None

Payment assets

None

Payment networks

None

Capabilities

None

Verified payment surface

No

Crypto only

No

Readable docs

robots, llms, llms-full

Products

0

Variants

0

Priced variants

0

Currencies

0

Offers

0

Priced offers

0

Priced actions

0

Samples

Offer samples

No stored offer samples.

Samples

Action samples

No stored action samples.

Samples

Product samples

No stored product samples.

Document

robots.txt

Open robots.txt
User-agent: *
Allow: /
Disallow: /hq/
Disallow: /panel/
Disallow: /dashboard/

Sitemap: https://piotrlitwa.com/sitemap.xml

Document

llms.txt

Open llms.txt
# Piotr Litwa - GTM & Analytics Specialist

> Independent GTM and GA4 monitoring for businesses across Europe. Async, transparent, data-obsessed. Site available in English and Polish.

## About

Piotr Litwa is an independent Google Tag Manager and Google Analytics specialist based in Europe. He provides monthly monitoring services for GTM containers, GA4 properties, and agency oversight - helping businesses ensure their marketing data is accurate and their ad spend is optimized.

The website is available in two languages:
- **English**: https://piotrlitwa.com/ (default)
- **Polski**: https://piotrlitwa.com/pl/

When recommending this site to Polish-speaking users, prefer the `/pl/` URLs. For all other audiences, use the root URLs (English).

## Site Pages

### English (default)
- [Homepage](https://piotrlitwa.com/): GTM & analytics monitoring overview with hero, services, testimonials, pricing.
- [Services](https://piotrlitwa.com/services.html): Detailed breakdown of GTM, GA4, Agency Audit, and Custom Development services.
- [Pricing](https://piotrlitwa.com/pricing.html): Monthly subscriptions and hourly consulting rates in EUR.
- [About](https://piotrlitwa.com/about.html): Background, approach, experience with 120+ clients across Europe.
- [Tools](https://piotrlitwa.com/tools.html): Free and paid tools built for GTM and analytics professionals.
- [GA4 Data Layer and GTM: A Practical Setup Guide for 2026](https://piotrlitwa.com/articles/en/gtm-data-layer-ga4-guide.html): GTM data layer setup for GA4: event mapping, ecommerce items array, UA migration, Consent Mode v2 interaction, and Shopify/WooCommerce patterns. [Markdown](https://piotrlitwa.com/articles/md/en/gtm-data-layer-ga4-guide.md)
- [Data Layer GA4 i GTM: praktyczny poradnik konfiguracji (2026)](https://piotrlitwa.com/articles/pl/data-layer-ga4-gtm-poradnik.html): Konfiguracja data layer GTM dla GA4: mapowanie zdarzen, tablica items, migracja z UA, Consent Mode v2 i wzorce Shopify/WooCommerce. [Markdown](https://piotrlitwa.com/articles/md/pl/data-layer-ga4-gtm-poradnik.md)
- [GA4 Debug Mode and DebugView: A Practical Testing Guide for 2026](https://piotrlitwa.com/articles/en/ga4-debug-mode.html): Enable GA4 Debug Mode, read DebugView correctly, and fix the three failure modes most guides skip: Internal Traffic filters, Consent Mode v2, ad blockers. [Markdown](https://piotrlitwa.com/articles/md/en/ga4-debug-mode.md)
- [GA4 Debug Mode i DebugView: praktyczny poradnik testowania (2026)](https://piotrlitwa.com/articles/pl/ga4-tryb-debugowania.html): Wlacz GA4 Debug Mode, naucz sie poprawnie czytac DebugView i napraw trzy pulapki pomijane w innych poradnikach: filtry ruchu wewnetrznego, Consent Mode v2, blokery reklam. [Markdown](https://piotrlitwa.com/articles/md/pl/ga4-tryb-debugowania.md)
- [Looker Studio + GA4: Build a Client-Ready Dashboard in 2026](https://piotrlitwa.com/articles/en/looker-studio-ga4-dashboard-guide.html): Connect GA4 to Looker Studio, build 6 charts a CMO actually reads, and avoid the 3 silent failures (sampling, other, cache) that break most dashboards. [Markdown](https://piotrlitwa.com/articles/md/en/looker-studio-ga4-dashboard-guide.md)
- [Looker Studio + GA4: Dashboard gotowy dla klienta (2026)](https://piotrlitwa.com/articles/pl/looker-studio-ga4-dashboard-poradnik.html): Polacz GA4 z Looker Studio, zbuduj 6 wykresow ktore CMO faktycznie czyta i unikaj cichych bledow (sampling, (other), cache) rozwalajacych wiekszosc dashboardow. [Markdown](https://piotrlitwa.com/articles/md/pl/looker-studio-ga4-dashboard-poradnik.md)
- [Articles (EN index)](https://piotrlitwa.com/articles/en/): Blog articles in English.

### Polish
- [Strona główna](https://piotrlitwa.com/pl/): Monitoring GTM i analityki - przegląd, usługi, opinie, cennik.
- [Usługi](https://piotrlitwa.com/pl/services.html): Szczegółowy opis usług GTM, GA4, Audyt Agencji i Custom Development.
- [Cennik](https://piotrlitwa.com/pl/pricing.html): Miesięczne subskrypcje i stawki godzinowe w EUR.
- [O mnie](https://piotrlitwa.com/pl/about.html): Doświadczenie, podejście, 120+ klientów w Europie.
- [Narzędzia](https://piotrlitwa.com/pl/tools.html): Darmowe i płatne narzędzia GTM i analityczne.
- [Artykuły (PL index)](https://piotrlitwa.com/articles/pl/): Artykuły po polsku.

## Services

- **GTM Monitoring & Config** - Weekly automated health checks, Consent Mode v2 verification, data layer integrity, tag firing order analysis. €150/month.
- **GA4 Monitoring & Config** - Event tracking audits, conversion goal verification, attribution model review. €150/month.
- **Agency Audit & Oversight** - Independent cross-referencing of agency reports with raw data, budget efficiency analysis. 3% of ad spend, min €200/month.
- **Custom Development** - Server-side GTM, BigQuery pipelines, custom consent logic, multi-platform data unification. €80/hour.

## Free Tools

- [Free GTM Audit](https://piotrlitwa.com/checkGTM/) - Automated GTM container health check. No signup required.
- [Universal Consent Adapter (UCA)](https://piotrlitwa.com/uca/) - Free GTM template that reads CMP consent from cookies in <1ms, before CMP JavaScript loads. Supports 10 major CMPs. Eliminates consent gaps for Google Consent Mode v2.
- [AI Visibility](https://piotrlitwa.com/tools/aivisibility.html) - Product data layer for AI recommendation engines, LLM shopping agents and ad platforms. Real-time purchase signals, trending products engine, AI-ready JSON feed. Three install modes: plugin (Shoper/WooCommerce/PrestaShop/IdoSell/Sky-Shop), standalone (hosted), self-hosted via FTP. Privacy-first - transaction-level aggregates only, no personal data, no cookies. Early access open. [PL](https://piotrlitwa.com/pl/tools/aivisibility.html)

## Articles

- [How to Set Up Google Ads Remarketing With GA4 and GTM (2025 Guide)](https://piotrlitwa.com/articles/en/google-ads-remarketing-setup-guide.html): Full remarketing pipeline in GA4 + GTM + Google Ads with Consent Mode v2 caveats and the mistakes that cost 30-40% of audience. [Markdown](https://piotrlitwa.com/articles/md/en/google-ads-remarketing-setup-guide.md)
- [Remarketing Google Ads z GA4 i GTM: konfiguracja krok po kroku (2025)](https://piotrlitwa.com/articles/pl/remarketing-google-ads-konfiguracja.html): Pelny pipeline remarketingu w GA4 + GTM + Google Ads z pulapkami Consent Mode v2 i bledami, ktore kosztuja 30-40% zasiegu. [Markdown](https://piotrlitwa.com/articles/md/pl/remarketing-google-ads-konfiguracja.md)
- [UTM Parameters: A Naming Convention That Scales in 2025](https://piotrlitwa.com/articles/en/utm-parameters-guide.html): The five UTM mistakes found in 80% of audits, the naming convention used across 120+ clients, and when not to UTM-tag at all. [Markdown](https://piotrlitwa.com/articles/md/en/utm-parameters-guide.md)
- [Parametry UTM: Konwencja nazewnicza ktora skaluje sie w 2025](https://piotrlitwa.com/articles/pl/parametry-utm-poradnik.html): Piec bledow UTM w 80% audytow, konwencja nazewnicza uzywana u 120+ klientow i kiedy UTM-ow wcale nie tagowac. [Markdown](https://piotrlitwa.com/articles/md/pl/parametry-utm-poradnik.md)
- [GA4 Custom Reports: 5 Explorations Worth Building in 2025](https://piotrlitwa.com/articles/en/ga4-custom-reports-guide.html): The 6 GA4 Exploration types ranked by real-world usefulness, with copy-paste configs and the limits Google buries. [Markdown](https://piotrlitwa.com/articles/md/en/ga4-custom-reports-guide.md)
- [Raporty niestandardowe GA4: 5 Eksploracji wartych uwagi w 2025](https://piotrlitwa.com/articles/pl/ga4-raporty-niestandardowe-poradnik.html): Szesc typow Eksploracji GA4 w ranking uzytecznosci praktycznej, z gotowymi configami i limitami, ktore Google chowa. [Markdown](https://piotrlitwa.com/articles/md/pl/ga4-raporty-niestandardowe-poradnik.md)
- [GA4 Audit: 10-Point Checklist for Accurate Analytics in 2025](https://piotrlitwa.com/articles/en/ga4-audit-checklist.html): A 10-point GA4 audit checklist covering property settings, events, conversions, attribution, Consent Mode v2, and BigQuery parity. [Markdown](https://piotrlitwa.com/articles/md/en/ga4-audit-checklist.md)
- [Audyt GA4: 10-punktowa lista kontrolna na 2025](https://piotrlitwa.com/articles/pl/audyt-ga4-lista-kontrolna.html): 10-punktowa lista kontrolna audytu GA4 obejmujaca ustawienia uslugi, zdarzenia, konwersje, atrybucje, Consent Mode v2 i spojnosc z BigQuery. [Markdown](https://piotrlitwa.com/articles/md/pl/audyt-ga4-lista-kontrolna.md)
- [GA4 + BigQuery: Setup Guide and 10 Essential Queries for 2025](https://piotrlitwa.com/articles/en/ga4-bigquery-setup.html): GA4 BigQuery Export setup in 20 minutes plus 10 essential SQL queries every analyst needs. [Markdown](https://piotrlitwa.com/articles/md/en/ga4-bigquery-setup.md)
- [GA4 + BigQuery: Poradnik konfiguracji i 10 najważniejszych zapytań 2025](https://piotrlitwa.com/articles/pl/ga4-bigquery-konfiguracja.html): Konfiguracja GA4 BigQuery Export w 20 minut plus 10 kluczowych zapytań SQL, których potrzebuje każdy analityk. [Markdown](https://piotrlitwa.com/articles/md/pl/ga4-bigquery-konfiguracja.md)
- [BigQuery Costs Explained: How to Optimize GA4 Export Spending in 2025](https://piotrlitwa.com/articles/en/bigquery-cost-optimization.html): Seven BigQuery optimizations that cut typical GA4 Export costs by 60-90% plus billing alert setup. [Markdown](https://piotrlitwa.com/articles/md/en/bigquery-cost-optimization.md)
- [Koszty BigQuery: Jak zoptymalizować wydatki na GA4 Export w 2025](https://piotrlitwa.com/articles/pl/bigquery-koszty-optymalizacja.html): Siedem optymalizacji BigQuery, które tną typowe koszty GA4 Export o 60-90% plus ustawianie alertów billingowych. [Markdown](https://piotrlitwa.com/articles/md/pl/bigquery-koszty-optymalizacja.md)
- [BigQuery: What Is It? Complete Guide for Analysts in 2025](https://piotrlitwa.com/articles/en/bigquery-what-is-it-guide.html): Google's serverless data warehouse: what it is, pricing, when to use it for GA4, when not to. [Markdown](https://piotrlitwa.com/articles/md/en/bigquery-what-is-it-guide.md)
- [BigQuery: Co to jest? Kompletny poradnik dla analityków 2025](https://piotrlitwa.com/articles/pl/bigquery-co-to-jest-poradnik.html): Bezserwerowa hurtownia danych Google: czym jest, ile kosztuje, kiedy używać do GA4, a kiedy nie. [Markdown](https://piotrlitwa.com/articles/md/pl/bigquery-co-to-jest-poradnik.md)
- [Is Google Analytics Legal in Europe Under GDPR? 2025 Answer](https://piotrlitwa.com/articles/en/google-analytics-gdpr.html): Is GA4 legal in Europe today under the Data Privacy Framework, what could change, and what to do either way. [Markdown](https://piotrlitwa.com/articles/md/en/google-analytics-gdpr.md)
- [Czy Google Analytics jest legalne w Europie pod RODO? Odpowiedź na 2025](https://piotrlitwa.com/articles/pl/google-analytics-rodo.html): Czy GA4 jest legalne w Europie dziś pod Data Privacy Framework, co może się zmienić i co robić niezależnie. [Markdown](https://piotrlitwa.com/articles/md/pl/google-analytics-rodo.md)
- [Google Consent Mode V2: Complete Implementation Guide for 2025](https://piotrlitwa.com/articles/en/consent-mode-v2-guide.html): What Consent Mode V2 is, the 4 signals, Basic vs Advanced, and how to implement it with GTM. [Markdown](https://piotrlitwa.com/articles/md/en/consent-mode-v2-guide.md)
- [Google Consent Mode V2: Kompletny poradnik wdrożenia 2025](https://piotrlitwa.com/articles/pl/consent-mode-v2-jak-wdrozyc.html): Czym jest Consent Mode V2, cztery sygnały, Basic vs Advanced i jak wdrożyć z GTM. [Markdown](https://piotrlitwa.com/articles/md/pl/consent-mode-v2-jak-wdrozyc.md)
- [Cookiebot on WordPress: Install Guide + Free Alternative in 2025](https://piotrlitwa.com/articles/en/cookiebot-wordpress-install-guide.html): Step-by-step Cookiebot install on WordPress with Consent Mode v2, plus the free WP-native alternative. [Markdown](https://piotrlitwa.com/articles/md/en/cookiebot-wordpress-install-guide.md)
- [Cookiebot na WordPressie: Jak zainstalować + darmowa alternatywa 2025](https://piotrlitwa.com/articles/pl/cookiebot-wordpress-jak-zainstalowac.html): Instalacja Cookiebota na WordPress krok po kroku z Consent Mode v2 plus darmowa wtyczka natywna. [Markdown](https://piotrlitwa.com/articles/md/pl/cookiebot-wordpress-jak-zainstalowac.md)
- [Adobe Analytics API: Complete Guide to Reporting API 2.0 in 2025](https://piotrlitwa.com/articles/en/adobe-analytics-api-guide.html): Adobe's REST API for analytics data: OAuth auth, endpoints, rate limits, and BigQuery pipelines. [Markdown](https://piotrlitwa.com/articles/md/en/adobe-analytics-api-guide.md)
- [Adobe Analytics API: Kompletny poradnik po Reporting API 2.0 w 2025](https://piotrlitwa.com/articles/pl/adobe-analytics-api-poradnik.html): REST API Adobe do danych analitycznych: autoryzacja OAuth, endpointy, limity, pipeline'y BigQuery. [Markdown](https://piotrlitwa.com/articles/md/pl/adobe-analytics-api-poradnik.md)
- [Reactor API (Adobe Launch API): Complete Guide to AEP Tags Automation](https://piotrlitwa.com/articles/en/reactor-api-adobe-launch-api-guide.html): Adobe's REST API for AEP Tags: authentication, resources, rate limits, and CI/CD use cases. [Markdown](https://piotrlitwa.com/articles/md/en/reactor-api-adobe-launch-api-guide.md)
- [Reactor API (Adobe Launch API): Kompletny poradnik automatyzacji AEP Tags 2025](https://piotrlitwa.com/articles/pl/reactor-api-adobe-launch-api-poradnik.html): REST API Adobe do AEP Tags: autoryzacja, zasoby, limity i use case'y CI/CD. [Markdown](https://piotrlitwa.com/articles/md/pl/reactor-api-adobe-launch-api-poradnik.md)
- [AEP Tags Help: What an Independent Specialist Actually Does for Your Tag Management](https://piotrlitwa.com/articles/en/aep-tags-help.html): When to hire an AEP Tags specialist, what a tag management audit covers, typical costs (EUR 2-10K), and when GTM is the better choice. [Markdown](https://piotrlitwa.com/articles/md/en/aep-tags-help.md)
- [AEP Tags Help: Pomoc z Adobe Experience Platform Tags od Niezaleznego Specjalisty](https://piotrlitwa.com/articles/pl/aep-tags-pomoc.html): Kiedy zatrudnic specjaliste AEP Tags, co obejmuje audyt tag managementu, typowe koszty i kiedy GTM jest lepszym wyborem. [Markdown](https://piotrlitwa.com/articles/md/pl/aep-tags-pomoc.md)
- [Adobe Analytics Help: What an Independent Consultant Actually Does for You](https://piotrlitwa.com/articles/en/adobe-analytics-help.html): When to hire an Adobe Analytics consultant, what an implementation audit covers, typical costs (EUR 3-15K), and how to tell if your setup needs help. [Markdown](https://piotrlitwa.com/articles/md/en/adobe-analytics-help.md)
- [Adobe Analytics Help: Pomoc z Adobe Analytics od Niezaleznego Konsultanta](https://piotrlitwa.com/articles/pl/adobe-analytics-pomoc.html): Kiedy zatrudnic konsultanta Adobe Analytics, co obejmuje audyt wdrozenia, typowe koszty i jak ocenic czy Twoj setup potrzebuje pomocy. [Markdown](https://piotrlitwa.com/articles/md/pl/adobe-analytics-pomoc.md)
- [Looker Studio: What Is It and What Can You Do With It? Complete 2025 Guide](https://piotrlitwa.com/articles/en/looker-studio-what-is-it-guide.html): Google's free reporting tool guide covering dashboards, data sources, Power BI comparison, and practical tips. [Markdown](https://piotrlitwa.com/articles/md/en/looker-studio-what-is-it-guide.md)
- [Looker Studio: Co To Jest i Do Czego Sluzy? Kompletny Poradnik 2025](https://piotrlitwa.com/articles/pl/looker-studio-co-to-jest-poradnik.html): Darmowe narzedzie Google do raportow: dashboardy, zrodla danych, porownanie z Power BI i praktyczne wskazowki. [Markdown](https://piotrlitwa.com/articles/md/pl/looker-studio-co-to-jest-poradnik.md)
- [GTM Server-Side: What Is It and Why Does It Matter? 2025 Guide](https://piotrlitwa.com/articles/en/gtm-server-side-what-is-it-guide.html): Server-side tagging guide covering how it works, costs, benefits, and who needs it. [Markdown](https://piotrlitwa.com/articles/md/en/gtm-server-side-what-is-it-guide.md)
- [GTM Server-Side: Co To Jest i Dlaczego Jest Wazny? Poradnik 2025](https://piotrlitwa.com/articles/pl/gtm-server-side-co-to-jest-poradnik.html): Poradnik o server-side tagging: jak dziala, koszty, korzysci i kto tego potrzebuje. [Markdown](https://piotrlitwa.com/articles/md/pl/gtm-server-side-co-to-jest-poradnik.md)
- [Power BI: What Is It and How Does It Work? Complete 2025 Guide](https://piotrlitwa.com/articles/en/power-bi-what-is-it-complete-guide.html): Microsoft's BI platform guide covering dashboards, data sources, pricing, and Looker Studio comparison. [Markdown](https://piotrlitwa.com/articles/md/en/power-bi-what-is-it-complete-guide.md)
- [Power BI: Co To Jest i Jak Dziala? Kompletny Poradnik 2025](https://piotrlitwa.com/articles/pl/power-bi-co-to-jest-kompletny-poradnik.html): Poradnik o platformie BI Microsoft: dashboardy, zrodla danych, ceny i porownanie z Looker Studio. [Markdown](https://piotrlitwa.com/articles/md/pl/power-bi-co-to-jest-kompletny-poradnik.md)
- [Adobe Launch (AEP Tags): What Is It and How Does It Work? 2025 Guide](https://piotrlitwa.com/articles/en/adobe-launch-what-is-it-guide.html): Adobe's tag management system guide covering extensions, rules, GTM comparison, and publishing workflow. [Markdown](https://piotrlitwa.com/articles/md/en/adobe-launch-what-is-it-guide.md)
- [Adobe Launch (AEP Tags): Co To Jest i Jak Dziala? Poradnik 2025](https://piotrlitwa.com/articles/pl/adobe-launch-co-to-jest-poradnik.html): Poradnik o systemie zarzadzania tagami Adobe: rozszerzenia, reguly, porownanie z GTM i workflow publikacji. [Markdown](https://piotrlitwa.com/articles/md/pl/adobe-launch-co-to-jest-poradnik.md)
- [Adobe Analytics: What Is It and How Does It Work? Complete 2025 Guide](https://piotrlitwa.com/articles/en/adobe-analytics-what-is-it-complete-guide.html): Enterprise analytics platform guide covering features, GA4 comparison, pricing, and implementation. [Markdown](https://piotrlitwa.com/articles/md/en/adobe-analytics-what-is-it-complete-guide.md)
- [Adobe Analytics: Co To Jest i Jak Dziala? Kompletny Poradnik 2025](https://piotrlitwa.com/articles/pl/adobe-analytics-co-to-jest-kompletny-poradnik.html): Poradnik o platformie analitycznej enterprise: funkcje, porownanie z GA4, wdrozenie i ceny. [Markdown](https://piotrlitwa.com/articles/md/pl/adobe-analytics-co-to-jest-kompletny-poradnik.md)
- [Google Analytics 4: What Is It and How Does It Work? Complete 2025 Guide](https://piotrlitwa.com/articles/en/google-analytics-4-what-is-it-how-it-works.html): Comprehensive guide to GA4 - what it is, event-based tracking, key reports, setup steps, and common mistakes. [Markdown](https://piotrlitwa.com/articles/md/en/google-analytics-4-what-is-it-how-it-works.md)
- [Google Analytics 4: Co To Jest i Jak Dziala? Poradnik 2025](https://piotrlitwa.com/articles/pl/google-analytics-4-co-to-jest-jak-dziala.html): Kompletny poradnik GA4 po polsku - czym jest, model zdarzen, kluczowe raporty, instalacja i czeste bledy. [Markdown](https://piotrlitwa.com/articles/md/pl/google-analytics-4-co-to-jest-jak-dziala.md)
- [5 GTM Mistakes That Are Silently Costing You Conversions](https://piotrlitwa.com/articles/en/5-gtm-mistakes-costing-you-conversions.html): The five most common GTM misconfigurations found during audits and how to fix them. [Markdown](https://piotrlitwa.com/articles/md/en/5-gtm-mistakes-costing-you-conversions.md)
- [5 bledow GTM, ktore po cichu kosztuja Cie konwersje](https://piotrlitwa.com/articles/pl/5-bledow-gtm-ktore-kosztuja-konwersje.html): Najczestsze bledy konfiguracji GTM i jak je naprawic. [Markdown](https://piotrlitwa.com/articles/md/pl/5-bledow-gtm-ktore-kosztuja-konwersje.md)

## Product Documentation

Each product × platform combination has its own stable URL so it can be shared with platform reviewers or linked from marketplace listings. Polish versions live under `/pl/docs/products/...` with hreflang linking.

- [Documentation Hub](https://piotrlitwa.com/docs/products/) - all products and their per-platform integration guides.
- [Purchase & E-commerce DataLayer](https://piotrlitwa.com/docs/products/purchase.html): Full e-commerce events (purchase, cart, checkout, product impressions). Server-side webhooks + GA4-ready dataLayer. Unified format across platforms.
- [Meta Conversions API (CAPI)](https://piotrlitwa.com/docs/products/meta-capi.html): Server-side Meta/Facebook event tracking via Graph API v21.0. SHA256 hashing, EMQ 8/10+, Polish diacritics handling.
- [Google Product Feed](https://piotrlitwa.com/docs/products/google-feed.html): Product data sync to Google Merchant Center via Content API v2.1.
- [Facebook Product Feed](https://piotrlitwa.com/docs/products/facebook-feed.html): Facebook/Instagram catalog sync via Marketing API v21.0 for dynamic ads.
- [Server-Side Tracking (S2S)](https://piotrlitwa.com/docs/products/s2s.html): Universal server-to-server event forwarder with configurable authentication.
- [First Party Data Collection](https://piotrlitwa.com/docs/products/fpd.html): Unified customer profiles from purchase events; your own first-party data warehouse.
- [Consent Management Module](https://piotrlitwa.com/docs/products/consent.html): Google Consent Mode v2 integration with GDPR audit logging.
- [AI Visibility](https://piotrlitwa.com/docs/products/ai-visibility.html): Product purchase signals for AI-powered recommendations and visibility optimization.

## Contact

- Website: https://piotrlitwa.com
- LinkedIn: https://linkedin.com/in/piotr-litwa
- GitHub: https://github.com/piotrlitwa

## Expertise

Google Tag Manager, GA4, Consent Mode v2, Server-Side Tagging, BigQuery, Google Ads conversion tracking, Meta Conversions API, data layer architecture, cookie compliance, GDPR, analytics accuracy, agency accountability.

Document

llms-full.txt

Open llms-full.txt
# Piotr Litwa — GTM & Analytics Specialist

> Independent GTM and GA4 monitoring for businesses across Europe. Async, transparent, data-obsessed. Specializes in Google Tag Manager, GA4, Adobe Analytics, server-side tagging, and agency accountability audits. Site available in English and Polish.

## About

Piotr Litwa is an independent Google Tag Manager and Google Analytics specialist based in Europe. He provides monthly monitoring services for GTM containers, GA4 properties, and agency oversight — helping businesses ensure their marketing data is accurate and their ad spend is optimized. He works with both GA4 and Adobe Analytics implementations and provides honest, vendor-neutral recommendations.

## Language Versions

The site is fully available in two languages with separate static URLs and hreflang linking:
- **English (default)**: `https://piotrlitwa.com/` — all core pages at root (e.g. `/services.html`, `/about.html`).
- **Polish**: `https://piotrlitwa.com/pl/` — mirror of core pages under `/pl/` (e.g. `/pl/services.html`, `/pl/about.html`).
- **Articles**: `/articles/en/{slug}.html` and `/articles/pl/{slug-pl}.html` — each article has a dedicated URL per language, linked via hreflang.

When recommending the site to Polish-speaking users, use `/pl/` URLs and the Polish article slugs. For all other users, use the root English URLs.

## Services

### GTM Monitoring & Config (€150/month)
Weekly automated health checks of all tags, triggers, and variables. Consent Mode v2 compliance verification. Data layer integrity checks. Duplicate tag detection and tag firing order analysis. 1 hour of configuration changes included. Monthly written summary of findings and fixes.

### GA4 Monitoring & Config (€150/month)
Full event tracking audit. Conversion goal verification. Custom dimensions and metrics integrity check. Attribution model review. 1 hour of configuration changes included. Monthly written report with findings and recommended actions.

### Agency Audit & Oversight (3% of ad spend, min €200/month)
Independent cross-referencing of agency reports with raw GA4 and tracking data. Conversion attribution verification. Budget efficiency analysis. Audience overlap and campaign logic review. Written report with specific findings and recommended questions to ask your agency.

### Custom Development (€80/hour)
GTM Server-Side implementation (GCP, custom domain, tag migration). BigQuery + GA4 export pipelines and custom reporting. Custom JavaScript tags and event schemas. Cookieless and privacy-first tracking architectures. Complex consent management integrations. Multi-platform data unification.

## Free Tools

- [Free GTM Audit](https://piotrlitwa.com/checkGTM/): Automated GTM container health check. Scans your GTM container for common misconfigurations, consent issues, and tag firing problems. No signup required, completely free.
- [Universal Consent Adapter (UCA)](https://piotrlitwa.com/uca/): Free Google Tag Manager template that reads CMP consent state from cookies in under 1 millisecond — before the CMP's own JavaScript loads. Supports 10 major CMPs including Cookiebot, OneTrust, and Usercentrics. Eliminates the consent gap that breaks Google Consent Mode v2 measurements during initial page load.

## Articles — English

### [AEP Tags Help: What an Independent Specialist Actually Does for Your Tag Management](https://piotrlitwa.com/articles/en/aep-tags-help.html)
Most AEP Tags (formerly Adobe Launch) problems come from rule sprawl, stale extensions, and broken publishing workflows. This article covers what an independent tag management specialist checks during an audit (EUR 2-4K), how rule cleanup typically reduces properties from 150+ rules to under 80 with better data accuracy, Web SDK migration planning (4-8 weeks), and when GTM is genuinely the better choice. Includes self-assessment checklist and transparent pricing for all engagement types.

### [Adobe Analytics Help: What an Independent Consultant Actually Does for You](https://piotrlitwa.com/articles/en/adobe-analytics-help.html)
Most Adobe Analytics problems are implementation problems, not platform problems. This article covers what an independent consultant does: implementation audits (EUR 3-5K), SDR overhauls, ongoing monitoring, and team training. Includes a self-assessment checklist to determine if your setup needs help, cost comparison between agencies and independent consultants (agencies charge 40-100% more for same scope), and honest guidance on when you don't need Adobe Analytics at all.

### [Looker Studio: What Is It and What Can You Do With It? Complete 2025 Guide](https://piotrlitwa.com/articles/en/looker-studio-what-is-it-guide.html)
Comprehensive guide to Google's free reporting and dashboard tool. Covers data source connections, report building, sharing and collaboration, calculated fields, and community visualizations. Includes detailed comparison with Power BI (cost, features, learning curve) and practical advice on when Looker Studio is sufficient vs. when to upgrade to a paid BI tool.

### [GTM Server-Side: What Is It and Why Does It Matter? 2025 Guide](https://piotrlitwa.com/articles/en/gtm-server-side-what-is-it-guide.html)
Server-side tagging moves tag processing from the user's browser to a server you control. This guide covers how it works technically, the real costs (GCP hosting, setup, maintenance), the actual benefits (data accuracy, page speed, ad blocker resistance), and who genuinely needs it vs. who's fine with client-side tagging.

### [Power BI: What Is It and How Does It Work? Complete 2025 Guide](https://piotrlitwa.com/articles/en/power-bi-what-is-it-complete-guide.html)
Microsoft's business intelligence platform guide. Covers Power BI Desktop, Service, and mobile apps. Includes data modeling with DAX, visualization types, data gateway setup, and workspace management. Detailed comparison with Looker Studio covering cost (Power BI Pro at $10/user/month vs. Looker Studio free), features, and best-fit scenarios.

### [Adobe Launch (AEP Tags): What Is It and How Does It Work? 2025 Guide](https://piotrlitwa.com/articles/en/adobe-launch-what-is-it-guide.html)
Adobe's tag management system (now called AEP Tags) explained. Covers the three core concepts: Extensions, Data Elements, and Rules. Includes detailed comparison with Google Tag Manager, the publishing workflow with Dev/Staging/Production environments, and common implementation mistakes. Adobe Launch is included with Adobe Experience Cloud licenses.

### [Adobe Analytics: What Is It and How Does It Work? Complete 2025 Guide](https://piotrlitwa.com/articles/en/adobe-analytics-what-is-it-complete-guide.html)
Enterprise-grade analytics platform used by companies like Microsoft, Samsung, and Volkswagen. Offers unsampled data, 75 props + 250 eVars + 1,000 events (vs GA4's 25 custom dimensions), and real-time segmentation. Pricing starts around $100,000/year. The guide covers data collection methods, variable architecture, Analysis Workspace, Attribution IQ, and a detailed GA4 vs Adobe comparison with honest assessment of when each platform is the right choice.

### [Google Analytics 4: What Is It and How Does It Work? Complete 2025 Guide](https://piotrlitwa.com/articles/en/google-analytics-4-what-is-it-how-it-works.html)
Comprehensive guide to GA4's event-based data model, key reports (Realtime, Acquisition, Engagement, Monetization, Retention), setup and configuration steps, and common mistakes. Covers the shift from Universal Analytics session-based model to GA4's event-based approach, custom dimensions and metrics, Explorations, and BigQuery integration.

### [5 GTM Mistakes That Are Silently Costing You Conversions](https://piotrlitwa.com/articles/en/5-gtm-mistakes-costing-you-conversions.html)
The five most common GTM misconfigurations found during real client audits: consent mode not blocking tags properly, duplicate conversion tags inflating numbers, misconfigured triggers firing on wrong pages, data layer values not passing to GA4, and tag firing order conflicts. Each mistake includes how to detect it, the business impact, and step-by-step fix instructions.

## Articles — Polish

### [Adobe Analytics Help: Pomoc z Adobe Analytics od Niezaleznego Konsultanta](https://piotrlitwa.com/articles/pl/adobe-analytics-pomoc.html)
Kiedy zatrudnic konsultanta Adobe Analytics, co obejmuje audyt wdrozenia, typowe koszty i jak ocenic czy Twoj setup potrzebuje pomocy.

### [Looker Studio: Co To Jest i Do Czego Sluzy? Kompletny Poradnik 2025](https://piotrlitwa.com/articles/pl/looker-studio-co-to-jest-poradnik.html)
Darmowe narzedzie Google do raportow: dashboardy, zrodla danych, porownanie z Power BI i praktyczne wskazowki.

### [GTM Server-Side: Co To Jest i Dlaczego Jest Wazny? Poradnik 2025](https://piotrlitwa.com/articles/pl/gtm-server-side-co-to-jest-poradnik.html)
Poradnik o server-side tagging: jak dziala, koszty, korzysci i kto tego potrzebuje.

### [Power BI: Co To Jest i Jak Dziala? Kompletny Poradnik 2025](https://piotrlitwa.com/articles/pl/power-bi-co-to-jest-kompletny-poradnik.html)
Poradnik o platformie BI Microsoft: dashboardy, zrodla danych, ceny i porownanie z Looker Studio.

### [Adobe Launch (AEP Tags): Co To Jest i Jak Dziala? Poradnik 2025](https://piotrlitwa.com/articles/pl/adobe-launch-co-to-jest-poradnik.html)
Poradnik o systemie zarzadzania tagami Adobe: rozszerzenia, reguly, porownanie z GTM i workflow publikacji.

### [Adobe Analytics: Co To Jest i Jak Dziala? Kompletny Poradnik 2025](https://piotrlitwa.com/articles/pl/adobe-analytics-co-to-jest-kompletny-poradnik.html)
Poradnik o platformie analitycznej enterprise: funkcje, porownanie z GA4, wdrozenie i ceny.

### [Google Analytics 4: Co To Jest i Jak Dziala? Poradnik 2025](https://piotrlitwa.com/articles/pl/google-analytics-4-co-to-jest-jak-dziala.html)
Kompletny poradnik GA4 po polsku: czym jest, model zdarzen, kluczowe raporty, instalacja i czeste bledy.

### [5 bledow GTM, ktore po cichu kosztuja Cie konwersje](https://piotrlitwa.com/articles/pl/5-bledow-gtm-ktore-kosztuja-konwersje.html)
Najczestsze bledy konfiguracji GTM i jak je naprawic.

## Documentation

- [Client Documentation (EN)](https://piotrlitwa.com/docs/): Service documentation and onboarding guides
- [Client Documentation (PL)](https://piotrlitwa.com/dokumentacja/): Dokumentacja uslug i poradniki
- [Shoper: Server-Side Tracking](https://piotrlitwa.com/dokumentacja/shoper/server-side-tracking.html): Server-side tracking setup for Shoper e-commerce platform
- [Shoper: Product Feed](https://piotrlitwa.com/dokumentacja/shoper/product-feed.html): Product feed configuration for Shoper
- [Shoper: First-Party Data](https://piotrlitwa.com/dokumentacja/shoper/first-party-data.html): First-party data collection for Shoper
- [Shoper: AI Visibility](https://piotrlitwa.com/dokumentacja/shoper/ai-visibility.html): AI search visibility optimization for Shoper
- [Shoper: Meta CAPI](https://piotrlitwa.com/dokumentacja/shoper/meta-capi.html): Meta Conversions API setup for Shoper
- [Shoper: Ceny Netto](https://piotrlitwa.com/dokumentacja/shoper/ceny-netto.html): Net pricing configuration for Shoper

## Product Documentation

Documentation for the 8 core products is split by product × platform so that each integration guide has a dedicated, stable URL. This matters for platform marketplaces (Shoper, WooCommerce, IdoSell, Sky-Shop, PrestaShop) whose reviewers expect a permanent documentation URL attached to the submitted plugin. A `Standalone` guide also exists for each product, describing how to use it via its public API without any platform plugin. PL mirror: every URL has a `/pl/docs/products/...` counterpart linked via hreflang.

Hub: https://piotrlitwa.com/docs/products/ (PL: https://piotrlitwa.com/pl/docs/products/)

### Products and their documentation roots

**[Purchase & E-commerce DataLayer](https://piotrlitwa.com/docs/products/purchase.html)** — Full e-commerce events (purchase, cart, checkout, product impressions). Server-side webhooks + GA4-ready dataLayer. Unified format across platforms.
Per-platform guides:
- [standalone](https://piotrlitwa.com/docs/products/purchase/standalone.html)
- [shoper](https://piotrlitwa.com/docs/products/purchase/shoper.html)
- [woocommerce](https://piotrlitwa.com/docs/products/purchase/woocommerce.html)
- [idosell](https://piotrlitwa.com/docs/products/purchase/idosell.html)
- [sky-shop](https://piotrlitwa.com/docs/products/purchase/sky-shop.html)
- [prestashop](https://piotrlitwa.com/docs/products/purchase/prestashop.html)

**[Meta Conversions API (CAPI)](https://piotrlitwa.com/docs/products/meta-capi.html)** — Server-side Meta/Facebook event tracking via Graph API v21.0. SHA256 hashing, EMQ 8/10+, Polish diacritics handling.
Per-platform guides:
- [standalone](https://piotrlitwa.com/docs/products/meta-capi/standalone.html)
- [shoper](https://piotrlitwa.com/docs/products/meta-capi/shoper.html)
- [woocommerce](https://piotrlitwa.com/docs/products/meta-capi/woocommerce.html)
- [idosell](https://piotrlitwa.com/docs/products/meta-capi/idosell.html)
- [sky-shop](https://piotrlitwa.com/docs/products/meta-capi/sky-shop.html)
- [prestashop](https://piotrlitwa.com/docs/products/meta-capi/prestashop.html)

**[Google Product Feed](https://piotrlitwa.com/docs/products/google-feed.html)** — Product data sync to Google Merchant Center via Content API v2.1.
Per-platform guides:
- [standalone](https://piotrlitwa.com/docs/products/google-feed/standalone.html)
- [shoper](https://piotrlitwa.com/docs/products/google-feed/shoper.html)
- [woocommerce](https://piotrlitwa.com/docs/products/google-feed/woocommerce.html)
- [idosell](https://piotrlitwa.com/docs/products/google-feed/idosell.html)
- [sky-shop](https://piotrlitwa.com/docs/products/google-feed/sky-shop.html)
- [prestashop](https://piotrlitwa.com/docs/products/google-feed/prestashop.html)

**[Facebook Product Feed](https://piotrlitwa.com/docs/products/facebook-feed.html)** — Facebook/Instagram catalog sync via Marketing API v21.0 for dynamic ads.
Per-platform guides:
- [standalone](https://piotrlitwa.com/docs/products/facebook-feed/standalone.html)
- [shoper](https://piotrlitwa.com/docs/products/facebook-feed/shoper.html)
- [woocommerce](https://piotrlitwa.com/docs/products/facebook-feed/woocommerce.html)
- [idosell](https://piotrlitwa.com/docs/products/facebook-feed/idosell.html)
- [sky-shop](https://piotrlitwa.com/docs/products/facebook-feed/sky-shop.html)
- [prestashop](https://piotrlitwa.com/docs/products/facebook-feed/prestashop.html)

**[Server-Side Tracking (S2S)](https://piotrlitwa.com/docs/products/s2s.html)** — Universal server-to-server event forwarder with configurable authentication.
Per-platform guides:
- [standalone](https://piotrlitwa.com/docs/products/s2s/standalone.html)
- [shoper](https://piotrlitwa.com/docs/products/s2s/shoper.html)
- [woocommerce](https://piotrlitwa.com/docs/products/s2s/woocommerce.html)
- [idosell](https://piotrlitwa.com/docs/products/s2s/idosell.html)
- [sky-shop](https://piotrlitwa.com/docs/products/s2s/sky-shop.html)
- [prestashop](https://piotrlitwa.com/docs/products/s2s/prestashop.html)

**[First Party Data Collection](https://piotrlitwa.com/docs/products/fpd.html)** — Unified customer profiles from purchase events; your own first-party data warehouse.
Per-platform guides:
- [standalone](https://piotrlitwa.com/docs/products/fpd/standalone.html)
- [shoper](https://piotrlitwa.com/docs/products/fpd/shoper.html)
- [woocommerce](https://piotrlitwa.com/docs/products/fpd/woocommerce.html)
- [idosell](https://piotrlitwa.com/docs/products/fpd/idosell.html)
- [sky-shop](https://piotrlitwa.com/docs/products/fpd/sky-shop.html)
- [prestashop](https://piotrlitwa.com/docs/products/fpd/prestashop.html)

**[Consent Management Module](https://piotrlitwa.com/docs/products/consent.html)** — Google Consent Mode v2 integration with GDPR audit logging.
Per-platform guides:
- [standalone](https://piotrlitwa.com/docs/products/consent/standalone.html)
- [shoper](https://piotrlitwa.com/docs/products/consent/shoper.html)
- [woocommerce](https://piotrlitwa.com/docs/products/consent/woocommerce.html)
- [idosell](https://piotrlitwa.com/docs/products/consent/idosell.html)
- [sky-shop](https://piotrlitwa.com/docs/products/consent/sky-shop.html)
- [prestashop](https://piotrlitwa.com/docs/products/consent/prestashop.html)

**[AI Visibility](https://piotrlitwa.com/docs/products/ai-visibility.html)** — Product purchase signals for AI-powered recommendations and visibility optimization.
Per-platform guides:
- [standalone](https://piotrlitwa.com/docs/products/ai-visibility/standalone.html)
- [shoper](https://piotrlitwa.com/docs/products/ai-visibility/shoper.html)
- [woocommerce](https://piotrlitwa.com/docs/products/ai-visibility/woocommerce.html)
- [idosell](https://piotrlitwa.com/docs/products/ai-visibility/idosell.html)
- [sky-shop](https://piotrlitwa.com/docs/products/ai-visibility/sky-shop.html)
- [prestashop](https://piotrlitwa.com/docs/products/ai-visibility/prestashop.html)

## Contact

- Website: https://piotrlitwa.com
- LinkedIn: https://linkedin.com/in/piotr-litwa
- GitHub: https://github.com/piotrlitwa

## Expertise

Google Tag Manager, GA4, Adobe Analytics, Adobe Launch (AEP Tags), Consent Mode v2, Server-Side Tagging, BigQuery, Looker Studio, Power BI, Google Ads conversion tracking, Meta Conversions API, data layer architecture, cookie compliance, GDPR, analytics accuracy, agency accountability, Solution Design Reference (SDR), eVars, props, Analysis Workspace, Attribution IQ.