Privacy policy

Last updated: 13 October 2026

TaiChiAI (the app for students), TaiChiAI Coach (the app for tai chi coaches and tai chi instructors) and the website taichiai.app are run by LSTGMove, a company registered in Mauritius, which is responsible for your personal data. For any question or request about your data, write to support@taichiai.app.

1. What we collect

• Your account: email address, name and, if you give it, your mobile number; whether you use TaiChiAI as a student, a tai chi coach or a tai chi instructor.
• Your tai chi profile: gender, and your age range and tai chi level if you enter them. Instructors also give their country, time zone, languages, a short description, their availability, time off, lesson fee and currency.
• Your body measurements (calibration): seven numbers — the length of your torso, shoulders, upper arm, forearm, thigh and shin, and an estimated height — and the date they were taken. We never store your picture or a video of you. The camera image is analysed on your phone and only these numbers are sent to us.
• Practice: body tracking runs on your phone. We store only your results — a score for each pose and level, and the date — not the camera picture and not your skeleton. We also store the routines you create.
• Tai Chi coaches' recordings: for each pose and level a coach records, the position of the body's joints. These are skeletons made of points, not pictures. Students see them anonymously: never the coach's name.
• Lessons: bookings, times, the student's note, cancellations, the lesson fee and TaiChiAI's commission, the payment details an instructor chooses to show students, and the rating and comment a student leaves after a lesson. Students pay instructors directly: TaiChiAI does not process lesson payments or see card details.
• Subscriptions: your plan, when it started and when it renews or ends, and which store it was bought in. Plans are paid to Apple (App Store) or Google (Google Play): we never see your card or payment details.
• Safety: the reviews or profiles you report, and the people you block.
• Technical data: our web server keeps standard logs (IP address, time and page requested) for security, for 14 days.

We do not show advertising, do not use advertising identifiers, do not track you across other apps or websites, and do not sell your data.

2. Why we use it

• To provide the service you signed up for: your account, your login codes, your poses, routines, scores and progress, and your lessons (booking, cancellation, notifying the other person, and invoicing instructors TaiChiAI's commission).
• To pair each student with a tai chi coach of the same gender and the closest build (using the body measurements), and to score practice against that coach's recorded poses. You agree to this when you calibrate, and you can withdraw your consent at any time by deleting your measurements.
• To show students the recordings of the coach they are paired with. Tai Chi coaches agree to this when they calibrate and record.
• To keep TaiChiAI safe: handling reports, blocking, and preventing fraud and abuse.
• To answer you when you write to us.

3. Who sees it

• Other users, only as needed: students see the recordings of the coach they are matched with, anonymously (a label such as "Twin 418", never the coach's name); students see an instructor's profile, rating and reviews (with the reviewer's first name); an instructor and a student see each other's name and the details of the lessons they share.
• Our service providers, who handle data only on our instructions: Amazon Web Services (servers, database and files, in the Mumbai, India region), Resend (sending login-code and lesson emails), ImprovMX (forwarding emails sent to support@taichiai.app), RevenueCat (which checks subscription purchases with the store, using your TaiChiAI account ID, and tells us when a plan starts, renews or ends), and Apple or Google for purchases in the App Store or Google Play.
• Authorities, only when the law requires it.

Your data is stored in India, which may be outside your country. Where the law requires it (for example for users in the European Union), these transfers are covered by our providers' standard data-protection clauses.

4. How long we keep it

• Your account, profile, body measurements, scores, lessons, reviews and reports: as long as your account exists. A pose coach's recorded poses, with their gender and body measurements: also after the account is closed, for as long as students practise against them.
• Backups of the database: up to 30 days, then deleted.
• Records of lesson fees and the commissions invoiced to instructors: as long as accounting and tax law requires, even after the account is deleted.
• Server logs: 14 days.

5. Your rights and choices

• Delete your account at any time in the app: Account › Delete account. Your profile, body measurements, recordings, scores, routines, lessons, reviews and reports are deleted, except accounting records we must keep by law. Pose coaches' recorded poses stay, so students can keep practising: the coach's account is then closed and anonymous, keeping only their gender and body measurements (see the Terms for coaches and instructors). For a student, we keep only a one-way code made from the email address (the address cannot be read back from it), so that the email address of a deleted account cannot be used to create a new account: a new account needs another email address.
• Delete only your body measurements: Account › Delete my body measurements.
• Block another user, and report a review or a profile, from the app.
• You can also ask us for a copy of your data, to correct it, to limit or object to its use, or to receive it in a portable format: write to support@taichiai.app. We answer within one month.
• If you are not satisfied, you can complain to the Data Protection Office of Mauritius, or to the data protection authority where you live.

6. Security

Data is always sent encrypted (HTTPS). Our database cannot be reached from the internet, backups are stored encrypted, and access is limited to what is needed to run TaiChiAI.

7. Children

TaiChiAI is not intended for anyone under 16. If you believe a child under 16 has created an account, write to us and we will delete it.

8. Changes

If we change this policy in an important way, we will tell you in the apps before the change applies. The date at the top shows the latest version.