Kai Simon Schubert
Use this command to install Kai:
winget install --id=SimonSchubert.Kai -e An open-source AI assistant with persistent memory
Loading...
README
Kai
An open-source AI assistant with persistent memory that runs on Android, iOS, Windows, Mac, Linux, and Web.
Installation
Homebrew (macOS):
brew install --cask simonschubert/tap/kai
AUR (Arch Linux):
yay -S kai-bin
Winget (Windows):
winget install SimonSchubert.Kai
Direct Downloads
| Platform | Format | Download |
|---|---|---|
| Android | APK | GitHub Releases |
| macOS | DMG | GitHub Releases |
| Windows | MSI | GitHub Releases |
| Linux | DEB | GitHub Releases |
| Linux | RPM | GitHub Releases |
| Linux | AppImage | GitHub Releases |
Features
- Persistent memory — Kai remembers important details across conversations and uses them automatically
- Customizable soul — Define the AI's personality and behavior with an editable system prompt
- Multi-service fallback — 17 LLM providers with automatic failover
- Tool execution — Web search, notifications, calendar events, shell commands, and more
- MCP server support — Connect to remote tool servers via the Model Context Protocol
- Autonomous heartbeat — Periodic self-checks that surface anything needing attention
- Settings export/import — Backup and restore all settings as a JSON file
- Encrypted storage — Conversations stored locally with encryption
- Text to speech — Listen to AI responses
- Image attachments — Attach images to any conversation
Screenshots
Desktop
Web
Mobile
How It Works
┌────────┐
│ User │
└───┬────┘
│ message
▼
┌─────────────────────────┐
│ Chat │
│ │
│ prompt + memories │
│ │ │
│ ▼ │
│ ┌────────┐ │
│ │ AI │◀─┐ │
│ └───┬────┘ │ │
│ │ tool calls │
│ │ & results │
│ ▼ │ │
│ ┌────────┐ │ │
│ │ Tools │─┘ │
│ └───┬────┘ │
│ │ │
└────────┼───────────────┘
│ store / recall
▼
┌─────────────────┐ hitCount >= 5
│ Memory │───────────────────┐
│ │ │
│ facts, prefs, │ ▼
│ learnings │ ┌────────────────┐
│ │◀─delete──│ Promote into │
└─────────────────┘ │ System Prompt │
▲ └────────────────┘
│ reviews
│
┌─────────────────┐
│ Heartbeat │
│ │
│ autonomous │
│ self-check │
│ every 30 min │
│ (8am–10pm) │
│ │
│ all good? │
│ → stays silent │
│ needs action? │
│ → notifies user│
└─────────────────┘
- Chat — User sends a message. The AI responds, calling tools (memory, web search, shell, etc.) in a loop until it has a final answer.
- Memory — The AI stores and recalls facts, preferences, and learnings. Memories that prove useful (5+ hits) can be promoted into the system prompt permanently.
- Heartbeat — A background self-check runs every 30 minutes. It reviews memories, pending tasks, and emails. If something needs attention, it notifies the user. Otherwise, it stays silent.
Supported Services
| Service | Website |
|---|---|
| Anthropic | https://console.anthropic.com |
| Cerebras | https://cerebras.ai |
| DeepSeek | https://www.deepseek.com |
| Gemini | https://aistudio.google.com |
| Groq | https://groq.com |
| Hugging Face | https://huggingface.co |
| LongCat | https://longcat.chat |
| Mistral | https://mistral.ai |
| Moonshot AI | https://moonshot.cn |
| NVIDIA | https://developer.nvidia.com |
| Ollama Cloud | https://ollama.com |
| OpenAI | https://openai.com |
| OpenRouter | https://openrouter.ai |
| Together AI | https://together.ai |
| Venice AI | https://venice.ai |
| xAI | https://x.ai |
| OpenAI-Compatible API | Ollama, LM Studio, etc. |
Plus a built-in Free tier that requires no API key.
MCP Servers
Kai supports the Model Context Protocol for connecting to external tool servers. Go to Settings > Tools > Add MCP Server to connect to any Streamable HTTP MCP endpoint, or pick from a curated list of popular free servers:
| Server | Description |
|---|---|
| Fetch | Fetch web content and convert HTML to markdown |
| DeepWiki | AI-powered docs for any GitHub repo |
| Sequential Thinking | Structured step-by-step problem-solving |
| Context7 | Up-to-date library and framework docs |
| Globalping | Ping, traceroute, DNS from global probes |
| CoinGecko | Real-time crypto prices and market data |
| Manifold Markets | Prediction market data and odds |
| Find-A-Domain | Domain availability across 1,444+ TLDs |
All popular servers are free and require no API key. MCP servers auto-reconnect on app startup.
Supported Languages
Afrikaans, Albanian, Amharic, Arabic, Belarusian, Bengali, Bulgarian, Chinese (Simplified), Chinese (Traditional), Croatian, Czech, Danish, Dutch, English, Estonian, Filipino, Finnish, French, German, Greek, Gujarati, Hebrew, Hindi, Hungarian, Indonesian, Italian, Japanese, Kazakh, Korean, Latvian, Lithuanian, Malay, Marathi, Norwegian, Persian, Polish, Portuguese, Punjabi, Romanian, Romansh, Russian, Serbian, Slovak, Slovenian, Spanish, Swahili, Swedish, Tamil, Telugu, Thai, Turkish, Ukrainian, Urdu, Vietnamese, Zulu
Contributing
Screenshot Automation
Two separate screenshot pipelines exist, both using Compose screenshot tests:
README screenshots — Used for this README. CI runs this automatically on every push and auto-commits any changes.
./gradlew :screenshotTests:updateScreenshots
Store screenshots — Generates localized screenshots for the Play Store in all supported locales. Upload via fastlane.
./gradlew :screenshotTests:generateStoreScreenshots
bundle exec fastlane android upload_screenshots
Sponsors
This project is open-source and maintained by a single developer. If you find this app useful, please consider sponsoring to help take it to the next level with more features and faster updates.
Credits
- Lottie animation: https://lottiefiles.com/free-animation/loading-wDUukARCPj
- Mistral: https://mistral.ai/