VietTone — Privacy Policy
Last updated: August 31, 2026
In short: VietTone has no accounts, collects no personal information, shows no ads, and contains no tracking. Your child's voice is used only for the moment of scoring a pronunciation and is never stored.
Who we are
VietTone is a free educational app that helps Vietnamese-heritage children practise the six Northern-Vietnamese tones. Contact: viettone.app@yahoo.com.
What we collect
Nothing that identifies you or your child. There is no sign-up, no account, no email, no name sent to us. The name typed at the start of the app is used only for greetings and stays on the device.
Learning progress
Lesson progress, scores, coins and settings are stored only on your device (local app storage). They are never uploaded. Deleting the app deletes them.
Microphone & voice recordings
- The microphone is used only when your child taps the microphone button to practise a word. The app asks for agreement at first launch, shows a plain-language notice before the very first recording, and iOS asks for microphone permission.
- The short recording is sent over an encrypted connection (HTTPS) to VietTone's own server for one purpose: computing the pronunciation score returned to the app. It is never sent to any third party.
- The recording is processed in memory and immediately deleted. We do not store, keep, share, sell, or listen to recordings, and we cannot link them to any person.
No third-party AI services
VietTone does not use any third-party AI service. Pronunciation scoring is classic pitch analysis that runs entirely on VietTone's own server. No user data — voice, name, or anything else — is ever sent to a third party.
Text-to-speech
Most word pronunciations are pre-recorded. If a clip is missing, our server (not the app) may request that word's audio from Google's text-to-speech service, sending only the dictionary word's text — never your child's voice, name, or any personal information.
What we don't do
- No advertising of any kind.
- No analytics, tracking, or profiling.
- No third-party SDKs that collect data.
- No selling or sharing of any data — we have nothing to sell.
Your choices — revoking consent & deleting data
- Revoke microphone consent anytime in iOS Settings → VietTone → Microphone. The rest of the app keeps working without the microphone.
- Delete all data by deleting the app — every score, setting and name is stored only on the device, so nothing remains anywhere else.
- Because recordings are deleted the moment they are scored, there is no stored voice data to request — but you can always contact us with any question or deletion request.
Children's privacy
VietTone is designed for children. Because we collect no personal information, there is nothing for us to retain or disclose. If you believe personal information has somehow reached us, contact us and we will delete it immediately.
Changes
If this policy ever changes, the new version will be posted at this address with an updated date above.