Privacy
Last updated: August 20, 2026
The short version
Without an account, nothing leaves your device. With one, we keep your email address and your progress, and nothing else. Your voice is never transmitted, never stored, and never heard by anyone.
Who publishes the app
Việt Nói is published by Vietnoi App. For any question about this data, write to [email protected] — every request sent there gets an answer.
If you don't create an account
The app works in full without an account, and offline. Your progress is written to the device's own storage and is not sent anywhere. Uninstalling the app erases it for good — which is the only reason an account is offered at all.
If you do create an account
The account exists to back up your progress and carry it to your other devices.
| Data | Where it comes from | Why |
|---|---|---|
| Email address | You, Google, or Apple | To identify your account and send the confirmation link |
| Provider identifier | Google or Apple, if you sign in through them | To recognize you on your way back |
| Your progress | Your use of the app | To carry it from one device to the next |
| Your subscription | Apple, Google, or Stripe | To know whether you're entitled to it |
"Your progress" is a specific object. It holds: which lessons you've read,
right and wrong answers with their dates, the review state of each notion,
the confusions recorded between two sounds, the settings you chose (language,
northern or southern Vietnamese, reminder time), and the energy and coins of
the in-app economy. Nothing else. It is the parcours table in the
schema — one row per account.
Your voice
The app records your voice to compare the pitch of what you say against a native speaker's. That recording never leaves your device. It is analyzed on the spot, then dropped.
What is kept is not audio: it is a list of numbers — the normalized pitch contour of your attempt, with no timbre and no words. Four are kept per phrase, one per day, so you can compare today's curve with the one from a month ago. Nobody, the publisher included, can turn those numbers back into sound.
Microphone permission is only requested the moment you press to speak, and declining it costs you nothing else.
Payments
The publisher never sees your card details. Apple handles payment on iPhone, Google on Android, and Stripe on the web — they are the merchants of record. RevenueCat keeps the receipt so we can tell whether your subscription is active. What lands in our database is a single boolean: active or not, and until when.
Ads
The free version offers rewarded ads — you choose to watch one, they never appear on their own. They are served by Google AdMob, and the app explicitly requests them as non-personalized: they are not selected from an advertising profile. Google still collects the technical data needed to serve them and to fight fraud — see Google's policy. Subscribing removes them entirely.
Reminders
If you set a daily reminder, it is scheduled on your device. No push token is created or transmitted, and no server knows you set one.
Who else sees this data
- Supabase — hosts the database and handles sign-in. Data is stored in Ireland (Western Europe), inside the European Union.
- Resend — sends confirmation and password-reset emails.
- RevenueCat — verifies subscription receipts on phones.
- Stripe — takes payments made on the website.
- Google AdMob — serves the rewarded ads.
- Cloudflare — serves the website.
This data is not sold, rented, or traded.
How long we keep it
As long as your account exists. There is no automatic expiry: progress is only worth something over time, and wiping it after a year would be punishing you for taking a break.
Deleting your account
From inside the app: Menu → Account → Delete this account. Deletion is immediate and permanent — the account, the backed-up progress, and the subscription entitlement all go together. What is on your device is left untouched.
You can also request a copy of your data, a correction, or its deletion by writing to [email protected]. If you are in Europe, these are your GDPR rights; in California, your CCPA rights.
Children
The app is not directed at children under 13 and asks them for nothing. If a child's account is reported to us, it is deleted.
If this text changes
The date at the top says when. Any change that would widen what is collected will be announced in the app before it takes effect, not after.