Sonapo Privacy Policy

Last updated 10 November 2026

Sonapo is a pronunciation coach for American and British English, made by Sonacast Oy (Finland). It works entirely on your phone. There is no account, no sign-in, no analytics and no advertising.

Your voice and recordings

• Sonapo uses the microphone only while you are reading a sentence aloud in the app.
• Your recordings are analysed on your phone by a speech model that runs on the device. They are never sent to us or anyone else.
• Recordings are saved in the app's private storage on your phone, so the app can play back your progress (for example "Day 1 vs Today").

Your progress

Your accent choice, interests, practice history and sound scores are stored in one file in the app's private storage on your phone. They are never uploaded.

What goes over the internet

On first launch, Sonapo downloads its speech, voice and text models (about 1.3 GB) from Google Firebase Storage. These downloads contain no personal data. As with any download, Google's servers see your device's IP address to deliver the files, under Google's Privacy Policy. Nothing else is sent anywhere.

Google Play

If you install Sonapo from Google Play, Google may collect crash reports and installation data under its own policies. Sonapo itself contains no third-party analytics or advertising code.

Deleting your data

Open Settings → Delete my data in the app to erase all recordings and progress immediately. Uninstalling the app deletes everything too, including the downloaded models. Because we never receive your data, we have nothing to delete on our side.

Children

Sonapo is not directed at children under 13 and does not knowingly collect any data from anyone.

Changes

If this policy changes, the new version will be posted on this page with a new date.

Contact

Sonacast Oy, Finland · kai@sonacasts.com