Fa - AI Agent

Fa is a personal AI agent that lives on your phone and your Mac. Chat with any OpenAI-compatible provider, run a real sandboxed coding agent, let it build mini-apps for you, and generate images, speech, and music — privacy-first, with your keys in the Keychain. ANY PROVIDER, YOUR KEYS - OpenRouter, OpenAI, Anthropic, Google, Ollama — any OpenAI-compatible endpoint - Add custom providers with your own base URL and models - On-device models (Gemma, WebLLM) for offline, zero-key chats - API keys stay in the iOS/macOS Keychain — never in config files, never uploaded A REAL AGENT, NOT JUST A CHAT - Fa thinks out loud: watch live reasoning, tool calls, and results - Sandboxed shell, file system, git, Python, Lua, SQLite, and JavaScript - Reads, writes, and patches code; searches the web; fetches pages - Approval tiers keep you in control of every write and command MINI-APPS ON DEMAND - Ask Fa to build an app — calculator, maps, notes, trackers — and it appears in your sidebar - Mini-apps can use your calendar, contacts, HomeKit devices, and Health data (with your permission) - Keep chatting with Fa right inside the app to refine it MEDIA GENERATION - Generate images inline in the chat - Text-to-speech and music generation with per-slot media models - Play audio and video right in the conversation YOUR DATA, YOUR DEVICE - Privacy-first analytics: no message text, no keys, no file contents — ever - Sessions stored locally, with optional iCloud sync - Rename sessions, branch conversations, rewind and checkpoint WORK THE WAY YOU LIKE - Dark and light themes, English and Russian UI - iPhone, iPad, and Mac — one app, one agent - Free and open source: bring your own key, pay only your provider Fa is the agent that works for you — on your hardware, under your rules.