Privacy Policy

Effective 2026-07-07

This policy explains what Lock In Chinese ("we") does and does not collect, both on this website and in the Lock In Chinese app. We have written it plainly. If anything is unclear, email us at hello@lockinchinese.com.

The short version

  • The app is local-first. Your study progress and your Screen Time data never leave your device.
  • This website collects one thing, and only if you offer it: the email address you type into the waitlist form.
  • We do not use advertising trackers, and we do not sell data.

The website (lockinchinese.com)

The only personal data this site collects is your email address, and only when you submit it through the waitlist form. We store it so we can email you once when Lock In Chinese launches. It is kept in Cloudflare Workers KV (our hosting provider's key-value store), together with which language site you signed up on and the timestamp of your signup. We do not pass it to a third-party email marketing service, and there is no double opt-in.

You can ask us to delete your waitlist email at any time by emailing hello@lockinchinese.com.

This site does not set advertising or analytics cookies, and it does not embed third-party tracking pixels. If we add privacy-respecting, aggregate analytics later, we will update this policy first.

The Lock In Chinese app

Lock In Chinese is designed to work without an account, and to keep your data on your device:

  • Your learning data stays on device. The words you are studying and your spaced-repetition (SRS) schedule are stored locally on your phone. They are not uploaded to us.
  • Your Screen Time data stays on device. To seal your social apps behind a quiz, the app uses Apple's Screen Time / Family Controls framework. That data is handled by iOS on your device under Apple's privacy protections. We never see which apps you use or how long you use them, and none of it is sent to our servers.
  • Purchases. When Lock In Chinese offers paid features at launch, purchases are handled through Apple's App Store and managed with Adapty, a subscription-management provider. Adapty processes the purchase and subscription information needed to unlock and restore what you bought. It does not receive your learning or Screen Time data. Apple's own privacy terms apply to the transaction.

Children

Lock In Chinese is not directed at children under 13, and we do not knowingly collect data from them.

Changes

If this policy changes, we will update the effective date at the top of this page. Material changes to how we handle a waitlist email will be announced on this page before they take effect.

Contact

Questions about privacy: hello@lockinchinese.com.