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# HammerAI

> Chat with role-playing AI characters that run locally on your computer - 100% free to chat and completely private.

HammerAI is a free, private AI chat application for talking to role-playing AI characters. It runs AI models locally on your computer, either in the web browser using WebGPU or in a downloadable desktop app for Mac, Windows, and Linux using Ollama and llama.cpp. Because all processing happens on your device, your conversations are completely private and never leave your machine.

HammerAI requires no sign-in, no account creation, and no configuration. Just open the app and start chatting. There is both a website and an desktop app. The desktop app works fully offline once downloaded.

## Website

- Homepage: https://www.hammerai.com
- Desktop App Download: https://www.hammerai.com/desktop
- Plans & Pricing: https://www.hammerai.com/plans
- Blog: https://www.hammerai.com/blog
- FAQ: https://www.hammerai.com/faq
- Privacy Policy: https://www.hammerai.com/privacy
- Terms of Service: https://www.hammerai.com/terms
- Contact: https://www.hammerai.com/contact

## How It Works

HammerAI runs large language models (LLMs) directly on the user's device. On the web, it uses WebGPU for in-browser inference. On desktop, it bundles Ollama with llama.cpp for native performance with automatic GPU acceleration. Users select a character, pick a model, and start chatting instantly.

## Core Features

- **Local AI Chat**: All model inference runs locally on your computer. No data is sent to external servers.
- **100% Free**: Chatting with local models is completely free with no usage limits.
- **No Sign-In Required**: Fully anonymous, zero configuration needed to start chatting.
- **Offline Mode**: Works without an internet connection once the app and model are downloaded.
- **Private**: Messages never leave your device when using local models. Your conversations are yours alone.
- **Character Library**: A diverse set of pre-made characters, both SFW and NSFW, ready to chat with.
- **Character Creation**: Create your own custom characters with detailed personality profiles, system prompts, and greeting messages.
- **Multiple AI Models**: Supports 20+ language models including both censored and uncensored options. Users can choose the model that best fits their needs.
- **Group Chats**: Chat with multiple AI characters simultaneously in a single conversation.
- **Image Generation**: Generate images using text-to-image AI within chats or as a standalone tool.
- **Story Writing**: Write stories collaboratively with AI assistance.
- **User Personas**: Create multiple user profiles to use across different conversations.
- **Lore Books**: Build custom world lore and background context that the AI references during roleplay.
- **Text-to-Speech**: Listen to character responses with TTS for more immersive conversations.
- **Chat Editing**: Edit messages and regenerate AI responses at any point in the conversation.
- **Chat History**: Save and revisit past conversations.
- **Customizable LLM Settings**: Full control over model parameters including temperature, top-p, top-k, repetition penalty, and context length.
- **Background Images**: Customize the look of your chat with background images.
- **Multi-Platform**: Available as a web app (any modern browser with WebGPU) and a desktop app (Mac, Windows, Linux).
- **Internationalized**: Available in multiple languages.

## Platforms

### Web App
The web app runs at https://www.hammerai.com and uses WebGPU for local model inference directly in the browser. No installation required. Works on any modern browser that supports WebGPU (Chrome, Edge, etc.).

### Desktop App
The desktop app is available for Mac, Windows, and Linux at https://www.hammerai.com/desktop. It bundles Ollama for local model management and uses llama.cpp for inference. Features automatic GPU acceleration and works completely offline.

## Cloud Features

In addition to free local chat, HammerAI offers optional cloud-powered features:

- **Free Cloud Chat**: Unlimited cloud chat with the Smart Lemon Cookie 7B model at no cost.
- **Starter Plan ($9/month)**: Private Discord access, priority support, access to better cloud models.
- **Advanced Plan ($18/month)**: Everything in Starter plus more cloud model options and better model quality.
- **Ultimate Plan ($35/month)**: Everything in Advanced plus 30,720 token context and access to the best available cloud models.

## Technology

HammerAI is built with:
- React and Next.js for the web frontend
- Electron for the desktop app
- Ollama and llama.cpp for local LLM inference
- WebGPU for in-browser model inference
- TypeScript throughout the stack

## Use Cases

- Role-playing and character conversations
- Creative writing and storytelling
- Companionship and casual conversation
- Dungeons & Dragons and tabletop RPG sessions
- Tarot reading and fortune telling
- Language practice
- Private, uncensored conversations
- Exploring AI without data privacy concerns

## About

HammerAI was created to make AI chat accessible, private, and free. Unlike cloud-based alternatives, HammerAI puts users in full control of their data by running models locally. There are no accounts required, no data collection, and no usage limits on local chat.