Privacy

We don't sell
your data.

Last updated: April 2026

No ads No data brokers No ad pixels Camera stays on-device

📷

Camera & Microphone — On-device only

Your camera feed is processed entirely inside your browser using WebGL (Google MediaPipe). No video or audio ever leaves your device. The app includes built-in privacy controls:

Crop to Hand Area — zooms into the hand, keeping your face out of frame.
Background Blur — keeps the hand sharp while blurring surroundings.

What We Collect & Why

Data	Why	Stored?
Username	Identify your account	Database
Password (hashed)	Authenticate via bcrypt	Hashed only
Email address	Password reset only	Optional
Practice progress	Track learning, show stats	Yes
Session history	Show streak & timeline	Yes
High score	Leaderboard	Yes
📷 Camera feed	Real-time hand tracking	Never stored
🖐 Hand landmarks	Detect finger positions	On-device only
🎙 Microphone	Tuner & string-check	Never recorded
Anonymous usage analytics	Improve reliability & understand feature usage (PostHog)	Analytics

We do not do: cross-site ad tracking, data-broker sales, or fingerprint-based advertising.

How We Use It

Save and sync your practice progress across sessions.
Enable password reset via email.
Power the leaderboard with your high score.
Improve the app through anonymised usage patterns (analytics).

We use a single HttpOnly cookie to keep you logged in. It cannot be accessed by JavaScript, expires after 7 days of inactivity, and is deleted immediately when you sign out. No third-party tracking cookies are used.

Your Rights & Data Deletion

You can access, correct, export, or permanently delete your data at any time.
When you delete your account, all data is immediately and permanently removed from our servers.
Contact hello@gtai.app with any data requests.

We don't sellyour data.

Camera & Microphone — On-device only

We don't sell
your data.