Docs
Kata AI.
Kata AI is the intelligence behind your coach. It is part of the product: nothing to set up, no accounts to connect, no keys to manage. You open the app and talk.
Part of the product
There is nothing to configure. Unlike tools that ask you to bring your own API key or wire up a model, Kata AI ships inside the app. You never see a settings screen for it, because there is nothing there for you to manage.
The model behind it
Kata AI runs on Claude by Anthropic. The default model is claude-haiku-4-5, chosen because it is fast and light enough to keep the coach instant and the running cost low, which is what makes generous fair use possible. The model can be pointed at a stronger Claude for specific tasks; you never have to think about any of this.
Personal to you
Before every answer, Kata AI reads your picture: recovery, training, food, weight, phase and history. That is why its advice is specific ("you are at 74 g protein and train at 18:00") where general chat tools can only be generic. How that context is assembled, and why it never leaves your device, is covered in How it reads your data.
It adapts, and it is honest
The way you write, the words you use, how direct you like your coaching: Kata AI picks these up and can be steered in plain words (How it adapts). And it knows its edges: it coaches everyday health, shows its sources when it uses the web, and sends you to a professional when that is the right answer (It is AI, not a doctor).
Your conversations are processed transiently to generate each answer and are not stored on our servers. The full picture is in Your data.