Cosmos Chat

Cosmos Chat

Your private AI companion - 12+ unique personas, voice chat, and zero cloud dependency. Chat with a Study Buddy, Code Helper, Fitness Coach, or create your own. Runs entirely on your phone.

Get it on Google Play

Key Features

  • AI personas with personality, not just a chatbot - Choose from 12 built-in characters - a creative writer, a stoic philosopher, a language tutor, even a dad-joke machine - each with distinct personality, greeting, and visual theme. Create your own custom personas with full control over behaviour, tone, and appearance. Every conversation feels purposeful because each persona is optimised for a specific kind of help.
  • 100% on-device processing, zero data leaves your phone - Download the AI model once, then everything runs loca - no internet, no API keys, no cloud calls, no tracking. Your conversations are stored in your phone's private storage and never transmitted anywhere. Unlike cloud-based AI apps, there's nothing to leak, no servers to go down, and no subscription that stops working when you cancel.
  • Voice and text chat in multiple languages, no subscription required - Speak or type in English, Chinese, Korean, or Japanese with on-device speech recognition that works offline. The app is free with optional one-time ad removal - no recurring fees, no token limits, no usage caps. Your AI assistant is always available, even in airplane mode.