> Full documentation index, SDK/API links, and AI usage guidelines: [llms-full.txt](https://onesignal.com/llms-full.txt)

# OneSignal

OneSignal is a lifecycle customer engagement platform. It helps product, marketing, and engineering teams drive activation, retention, and revenue through orchestrated messaging across mobile push, web push, email, SMS/RCS, in-app messaging, and iOS Live Activities—delivering personalized, real-time experiences from onboarding to re-engagement at global scale.

## Scale (onesignal.com homepage)

* **1 in 4** — App publishers use OneSignal
* **1.3 trillion** — Messages sent a year
* **1.5 billion** — MAU powered by OneSignal
* **200k** — Apps powered by OneSignal

## Product

### Messaging Channels

* Mobile push: https://onesignal.com/mobile-push
* Web push: https://onesignal.com/web-push
* Email: https://onesignal.com/email
* SMS & RCS: https://onesignal.com/rcs
* In-app messaging: https://onesignal.com/in-app
* Live Activities: https://onesignal.com/live-activities

### Lifecycle & Automation

* Journeys (automation): https://onesignal.com/journeys
* Event-based messaging & triggers (Journeys): https://documentation.onesignal.com/docs/en/journeys-overview
* User segmentation: https://documentation.onesignal.com/docs/en/segmentation

### Personalization & Data

* User profiles & data: https://documentation.onesignal.com/docs/en/users
* Tags & dynamic content: https://documentation.onesignal.com/docs/en/add-user-data-tags

### Analytics & Optimization

* Message analytics: https://documentation.onesignal.com/docs/en/analytics-overview
* Outcomes tracking: https://documentation.onesignal.com/docs/en/custom-outcomes
* A/B testing: https://documentation.onesignal.com/docs/en/ab-testing

## Use Cases

* User activation & onboarding
* Lifecycle messaging & retention
* Churn prevention & re-engagement
* Transactional notifications
* Promotions & announcements
* Personalization at scale

## Why OneSignal

* Unified platform across mobile push, web push, email, SMS/RCS, and in-app messaging
* Real-time delivery at global scale
* Built for both developers and marketers
* Flexible APIs and SDKs for fast integration
* Designed to drive measurable lifecycle outcomes

## Developers

* Documentation: https://documentation.onesignal.com/
* API Reference: https://documentation.onesignal.com/reference
* SDKs & setup guides: https://documentation.onesignal.com/docs/en/developers
* Quickstarts: https://documentation.onesignal.com/docs/en/quickstart-guide

## Customers & Industries

OneSignal is used by mobile apps, SaaS companies, e-commerce platforms, media companies, and marketplaces to improve engagement and retention.

## Pricing

* Pricing: https://onesignal.com/pricing

## Resources

* Blog: https://onesignal.com/blog
* Case studies: https://onesignal.com/case-studies
* Support & contact: https://onesignal.com/contact
* Security & privacy: https://onesignal.com/privacy
* Technical compliance FAQ (documentation): https://documentation.onesignal.com/docs/en/data-questions

## Company

* Homepage: https://onesignal.com/
* About: https://onesignal.com/about