LastChat

LastChat is a feature-rich AI assistant application for Android. It is a fork of RikkaHub, modified using Claude 4.5 Opus and Gemini 3 Pro

This project aims to provide a privacy-focused and highly personalized AI chat experience on Android

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✨ Key Features

Advanced AI Capabilities

• Multi-Provider Support: Works with OpenAI, Google and OpenRouter out of the box. There's support for custom providers too!
• Local RAG Memory: Features a sophisticated Vector-Based Long-Term Memory system. Assistants can "remember" details from past conversations using embeddings.
• Multi-Modal Inputs: Interact using Text, Images, Video, and Audio.

Tools & Integrations

• Local Device Control: The AI can interact with your device if you want:
  • Send notifications
  • Launch apps
  • Read notifications
  • Set alarms/reminders
• Code Execution: Built-in JavaScript Engine (QuickJS) for performing calculations and logic.
• Web Search: Integrated web search capabilities to fetch real-time information.

Assistant Management

• Multiple Personas: Create, manage, and switch between unlimited custom assistants.
• Tagging System: Organize assistants with custom tags.
• Import/Export: Easily share or backup your assistant configurations.
• Global Settings: Centralized management for memory consolidation and background behaviors.

Modern & Fluid UI

• Material You: Fully embraces Material Design 3 with Dynamic Color support that adapts to your wallpaper.
• Rich Rendering: Markdown support with LaTeX for math, code highlighting, and tables.

Additional Modules

• Image Generation: Dedicated interface for generating images using supported models.
• Translator: A specialized mode for text translation.
• Text-to-Speech (TTS): Supports system TTS or other providers.

Privacy & Data

• Local-First: Chat history and vector memory are stored locally on your device.
• WebDAV Backup: Securely sync and backup your data to any WebDAV-compatible server.

Built With

• Kotlin & Jetpack Compose
• Koin for Dependency Injection
• Room & DataStore for persistence
• WorkManager & AlarmManager for reliable background tasks

Credits

• Original Project: RikkaHub
• Assistant settings menu layout comes in part from PixelPlayer
• Image cropper is an edited version from the image editor found in LavenderPhotos
• Made with AI Agents based on:
  • Claude 4.5 Opus
  • Gemini 3 Pro

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Note: This project is a fork and may contain modifications or features not present in the original RikkaHub repository.