Thanh Điệu Privacy Policy

Thanh Điệu (“the app”, Thanh Dieu: Chinese Tones on Google Play) helps Vietnamese speakers practise Mandarin tones, pinyin, HSK words and HSKK speaking. It is published by FightTech. Short version: there is no account, and the free Android app shows ads from Google AdMob (none while you have Pro or after you buy a credit pack). Tone drills are measured on your phone. Your voice leaves the phone only when you use a cloud AI feature (the call with Hạc, the AI conversation partner, mock test scoring), and purchases are handled by Google Play.

1. What stays on your phone

• Your recordings, tone scores, dictation results, HSK word decks, mock test reports and progress.
• Your learning profile: goal, level, daily time and the plan you approved.
• Settings, including the AI engine you chose and, if you entered one, your own API key, which is only sent to the endpoint you configured.

There is no user account and nothing is synced to a cloud. Android backup is off; deleting the app deletes everything stored on your device.

2. Permissions

• Microphone: to record what you say in drills, dictation, mock tests and calls. Recording only happens while you use the record or call button.
• Notifications (optional): the daily reminder, if you turn it on.
• Thanh Điệu does not use the camera, your location, contacts or photos.

Model sentences are read aloud with the text-to-speech voices built into your phone.

3. AI processing

• On device: tone measurements, and on-device transcription. Nothing leaves the phone.
• Cloud AI (free allowance or credits): Our gateway at fighttech.vn, which forwards the request to the AI model provider we use for that task (currently Google Gemini for audio and Anthropic Claude for text). The provider processes the request to return the result, under its own terms, and may do so outside your country, including in the United States. We keep usage records (request counts and credits) to enforce limits; we do not keep the audio or text and do not build a profile of you.
• Your own API key: directly to the endpoint you configured. We never see it.

With cloud AI the app sends, for each request: the audio of what you said (for transcription), its transcript and the text of the task or conversation turn. It never sends your name, email, contacts or photos.

We use what you send only to return the result to you. We do not sell it, use it for advertising, or use it to train our own models.

4. Content downloads

The app downloads signed lesson catalogs and, if you choose on-device transcription, a speech model. These downloads carry no personal data.

5. Purchases

Thanh Điệu Pro (monthly, quarterly, yearly or lifetime) and credit packs are sold through Google Play. Payment is handled entirely by Google; we never receive your card details. To confirm a purchase, the app sends the purchase token, the product id and a random install id to our billing endpoint at fighttech.vn, which checks it with Google Play and returns your Pro status or the credits to add. Manage or cancel a subscription in Google Play › Payments & subscriptions.

6. Analytics and ads

Thanh Điệu sends no analytics and no crash reports.

The free Android app shows ads from Google AdMob: a banner, possibly a full-screen ad between activities, and optional rewarded ads you can choose to watch to unlock Thanh Điệu Pro for 30 minutes. Google may use the advertising ID, device information, approximate location derived from the IP address and your interactions with ads to show and measure ads. Where the law requires it (for example in the EEA and the UK), the app first asks for your consent through Google’s consent form (UMP), and you can change your choice at any time under the privacy options in Settings. You see no ads while you have Pro (an active subscription or the lifetime purchase), after you buy a credit pack on this install, and during the 30-minute Pro window unlocked by a rewarded ad. If a subscription ends, ads come back. Your recordings are never sent to AdMob. We sell no data and build no advertising profile ourselves. How Google uses data from apps that show its ads: policies.google.com/technologies/partner-sites. You can reset or delete the advertising ID in the Android settings, under Privacy → Ads.

7. Who receives data

• FightTech (fighttech.vn): the cloud AI gateway and purchase verification described above.
• AI model providers, only when you use cloud AI: Google (Gemini) and Anthropic (Claude).
• Google AdMob, for ads in the free Android app.
• Google, for payments through Google Play.
• The endpoint you configure, when you use your own API key, under that provider’s terms.

We do not sell personal data, and we share it only with the recipients listed above, to run the features you use.

8. Children

The app is not directed at children under 13 and we do not knowingly collect data from them.

9. Deleting your data

Everything on the phone is deleted when you delete the app or clear its data. We do not keep the audio or text of cloud AI requests; only usage counts tied to the random install id. To have those removed, email us and we will delete them within 30 days.

10. Data sources

Dictionary data: CC-CEDICT (CC BY-SA 4.0) and the Unicode Unihan database (Unicode License V3). Full credits are in the app.

11. Changes and contact

If this policy changes in a way that affects what is sent, we update this page and the app tells you before sending anything new.

Questions or requests: fighttech.vn@gmail.com · FightTech, Vietnam

Terms of Use · Support