Last updated: 2026-11-02
Vowel Border ("the app") is made by Chungkyeong Lee. This policy explains what the app does with information. It applies to the app on iPhone and Android.
Nothing. The app has no accounts, no sign-up, no advertising, no analytics and no tracking, and it does not connect to any server of ours. The Android app has no internet permission at all. The app does not access your contacts, photos, location, camera, microphone or other personal data on your device.
The words you hear are spoken by the English text-to-speech voices already installed on your device (Apple's voices on iPhone, your text-to-speech engine on Android). The app reads the list of installed voices to show it to you and to pick the next voice; it does not download voices, send text anywhere or record anything. The word lists are bundled inside the app.
Your quiz trials and rounds (which pair, which voice, right or wrong), each border's score, and your settings (voices on or off, accent preference, speed, auto-advance, reminder time) are stored only on your device. They leave it only if your device's own backup includes them. "Reset progress" in Settings or deleting the app removes them.
If you turn on the daily reminder, the app schedules a local notification on your device at the time you choose. No notification server is involved; you can turn it off in Settings at any time.
The app contains no third-party SDKs that collect data. The word lists were checked against the CMU Pronouncing Dictionary (Carnegie Mellon University, BSD license); we are not affiliated with it. We do not sell, rent or share any information.
We keep no personal data, so there is nothing to delete on our side. If you have any request about your data, email us and we will answer within 30 days.
The app is suitable for all ages and does not knowingly collect information from anyone, including children.
If this policy changes, the new version will be posted on this page with a new date.
Chungkyeong Lee · [email protected]