The app works on your phone. It has no account and does not send your study data anywhere. We do not use advertising or tracking SDKs. The only time anything leaves your phone is the optional AI feedback feature in Speaking practice, which is off until you turn it on (see below).
This data is included in your normal iOS backups (iCloud or computer backups) according to your own iOS settings. We cannot access those backups.
In Speaking practice you can turn on AI feedback. When it is on, after you stop a recording the app sends:
Nothing else is sent — no name, no email, no study history. The app attaches a random installation identifier only to limit how many requests one phone can make per day. We do not store the audio or the transcript on our server; Cloudflare and Anthropic process them under their own policies (Anthropic’s API does not use customer data for model training). You can turn AI feedback off at any time in Settings; the app then uses the on-device self-check list instead. If the feature is not configured in your version of the app, the switch does not appear.
The app is free and has no in-app purchases. English, Vietnamese, Chinese (Simplified) and Russian are all included in the app and work offline. Your language choice is saved only on your phone. The app does not contact the App Store about purchases.
If you agree to it in Settings, the app may send anonymous crash reports (device model, iOS version, app version, stack trace) to our crash-reporting provider so we can fix bugs. These reports never include your recordings, answers or settings. This is off by default and not present in the current version.
The app is intended for adult learners enrolled in the Korea Immigration and Integration Program. It is not directed to children under 13.
Questions: mju.jykim@gmail.com
We will post updates to this page and change the effective date above.