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Chat, translate, ask anything - all on your device, all private.
Kaia is a capable AI assistant that runs entirely on your phone. Ask anything. Translate languages. Talk hands-free. Nothing leaves your device. — What makes Kaia different — Most AI apps send your messages to a server. Kaia doesn't. Every chat, every translation, every voice command runs locally on your phone using Google's Gemma 4 model. There's no cloud round-trip, no account to create, no subscription to remember, and no telemetry following you around. Open it. Use it. Close it. Your data stays where it belongs. — What you can do — • Chat. Ask Kaia anything: draft an email, plan a trip, summarize a PDF, explain a concept. The model thinks on your device. • Translate. 30+ languages, fully offline. Quick mode for typed text. Conversation mode for back-and-forth across two languages, with voice input and audio replies. • Talk to it. Speak instead of typing. Kaia transcribes, replies, and reads its answer back. Audio never leaves the device. • Bring your own search (optional). Want fresh web results? Drop in a free API key from Tavily or Brave. Off by default; you decide when Kaia reaches the network. • Personas. Save custom system prompts per chat. Coding coach, writing editor, study tutor — whatever you need. — How it stays private — • No accounts. No sign-up screens, no email collection, no "trust us" privacy policy. There's nothing to trust because there's nothing leaving. • No cloud. The model lives in your phone's storage. Inference runs on the device's CPU or GPU. • No tracking. No analytics SDKs, no advertising IDs, no telemetry. • No surprise backups. Chat history and model files are excluded from iCloud and Google Auto Backup by default. — Free vs Pro — Kaia's core chat works free, forever. Pro is a one-time purchase that unlocks: • Voice input and replies (hands-free chat) • Translation across 30+ languages • Chat export (Markdown / PDF) • Custom system prompts (personas) • Natural neural TTS voices (Android only — iOS uses Apple's built-in voices) Pay once. Own it forever. No subscription, no recurring fees, no "free trial" that quietly converts. — Under the hood — Built on Google's LiteRT-LM runtime and the Gemma 4 family of on-device models. Picks the right backend for your hardware (Metal GPU on iPhone, GPU or CPU on Android). The default Gemma 4 E2B runs comfortably on iPhone 15 and modern flagship Android. Larger models are available for more capable hardware. — Who it's for — Anyone who wants the capability of a modern AI assistant without sending their conversations through someone else's data center. Journalists, lawyers, doctors, students, engineers, writers, the privacy-curious, and anyone tired of paying for three subscription chatbots they keep forgetting to cancel. — What it isn't — Kaia isn't trying to replace ChatGPT or Claude on every task. A 2–4B on-device model is small by cloud standards. It excels at writing help, translation, structured tasks, and the kinds of personal questions where privacy matters more than encyclopedia-level recall. It's the assistant you can trust with your real life. Download once. Pay once (or don't). Keep your conversations where they belong - on your phone.