Kai

An open-source AI assistant with persistent memory that runs on Android, iOS, Windows, Mac, Linux, and Web.

Overview

Kai is built with Kotlin Multiplatform and Compose Multiplatform. It connects to 11+ LLM providers with automatic fallback, remembers important details across conversations, and can act autonomously via scheduled heartbeats and tool execution.

Key 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 — Configure multiple providers; Kai automatically tries the next one on failure
Tool execution — Web search, notifications, calendar events, shell commands, and more
Autonomous heartbeat — Periodic self-checks that surface anything needing attention
Encrypted storage — Conversations are stored locally with encryption
Text to speech — Listen to AI responses
Image attachments — Attach images to any conversation

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│
           └─────────────────┘

Supported Services

Service	API Type
OpenAI	OpenAI-compatible
Gemini	Gemini native
DeepSeek	OpenAI-compatible
Mistral	OpenAI-compatible
xAI	OpenAI-compatible
OpenRouter	OpenAI-compatible
Groq	OpenAI-compatible
NVIDIA	OpenAI-compatible
Cerebras	OpenAI-compatible
Ollama Cloud	OpenAI-compatible
OpenAI-Compatible API (Ollama, LM Studio, etc.)	OpenAI-compatible

Plus a built-in Free tier that requires no API key.

Platforms

Platform	Distribution
Android	Google Play, F-Droid, APK
iOS	App Store
macOS	Homebrew, DMG
Windows	MSI
Linux	DEB, RPM, AppImage, AUR
Web	Browser

Feature Documentation

Chat & Conversations — Message history, conversation persistence, image attachments, and speech output
Multi-Service — Provider configuration, fallback chain, and connection validation
Tools — Available tools, execution flow, safety guards, and enablement
Memories — Memory lifecycle, categories, reinforcement, and promotion
Heartbeat — Autonomous self-checks, active hours, and configuration
Tasks — Scheduled tasks, future execution, and task management
Daemon — Background service for scheduled tasks and heartbeat execution

Kai