Privacy policy
Project Tau writes and adjusts training plans with an AI model. This policy explains what data that involves, where it goes, and how to delete it.
What stays on your phone
Your profile, goal, plan, session logs, check-ins, test results and coach conversation are stored only in the app on your phone. We do not keep a copy on our servers.
What is sent to generate your plan
When the app writes or adjusts your plan, explains an exercise, or answers in the coach chat, it sends the information that request needs to our server, which forwards it to an AI model and returns the answer. That can include:
- your goal and your answers to the goal questions
- age, sex, height, weight, training experience and current activity
- training days, session length and equipment
- injuries and limitations you entered
- test results, session logs (effort, pain, notes), weekly check-ins and coach messages
Our server passes this to OpenRouter, which routes it to Claude, a model made by Anthropic. They process it to produce the response, under their own privacy policies. Our server does not store the content of these requests or responses.
The app asks for your agreement before anything is sent.
What our server keeps
- A random install ID, the date it was created, and your subscription level. It is not linked to your name, email, Apple ID or device identifiers.
- Daily usage counts per install ID, to enforce fair-use limits.
- A salted, one-way hash of your IP address with a daily count, to limit abuse. The address itself is not stored.
Our hosting provider, Vercel, keeps standard request logs (such as IP address and time) for a limited period. Our database runs on Neon.
What we don't do
No advertising, no analytics or tracking SDKs, no selling or sharing of data with data brokers, and no account with your name or email.
Deleting your data
In the app, open Settings and choose Erase all data. That deletes everything on your phone and the install ID and usage counts on our server. Deleting the app also removes the data on your phone.
Health information
Plans are general training guidance, not medical advice. Talk to a doctor or physiotherapist about injuries, pain or medical conditions.
Children
Project Tau is not intended for children under 13.
Changes and contact
If this policy changes, the new version will be posted here with a new effective date. Questions: support@projecttau.com.