Privacy Policy

Baithak (“the app”) is an iPhone app that teaches the game of mahjong. We built it to collect as close to nothing as possible.

What stays on your iPhone

Your learning progress — completed lessons, skill records, streaks, and any table date you set — is stored only on your device. It is never uploaded. There are no accounts.

What we collect

The app sends anonymous usage events to our analytics provider (PostHog, hosted in the European Union) so we can see which lessons work and which confuse learners. An event looks like “a lesson was completed” or “an answer was wrong at step 3.”

These events contain:

• a random identifier created on your device (not your name, phone number, Apple ID, email, advertising ID, or device serial);
• the event name, the lesson/step involved, and the app version.

They never contain your identity, your location, the contents of your practice hands, or anything typed by you (the app has no text input).

If you buy the Full Course, the purchase is processed entirely by Apple — we never see your payment details. The app records only an anonymous event that a purchase happened, with no amount and no identity attached.

You can turn analytics off any time in Settings → Sound & touch → Privacy → Share anonymous usage. The app works identically with it off.

What we never do

• No ads, and no data is sold or shared for advertising.
• No tracking across other apps or websites (the app never asks for App Tracking Transparency because it does not track).
• No accounts, no emails, no contact lists, no location, no microphone, no camera.

Data retention and contact

Anonymous events are retained in PostHog for product analysis and can be deleted in bulk on request. Questions or requests: b@severalapps.com.

Changes

If our data practices ever change, this policy will be updated and the app’s privacy label on the App Store will reflect it.