Privacy Policy
Last updated: 2026-07-24 · App: Manguage (Android / iOS)
Manguage (“the app”) is built to put your privacy first. No account is required, and the manga images and cards you create stay on your device by default. This policy explains what the app does — and does not — do with data.
1. What never leaves your device
- Manga photos and images. Imported images are not sent off your device. Text recognition (OCR) runs on-device.
- Flashcards, decks, study history, XP and streaks. All stored on your device. We do not keep them on our servers.
- Any optional on-device backup you create is saved to a location you choose (your device or your own cloud drive); we are not involved.
2. What is sent for translation
- By default the app uses online translation (Google’s Gemini API via Firebase AI Logic). The only thing sent is the text recognized from the image (the dialogue). The image itself is never sent.
- That text is processed only to translate it and is not stored by us. We use Google’s paid API, so your text is not used to train Google’s generative AI models.
- If you add the “Offline Pack”, translation runs on-device when you have no signal, and no text is sent (optional feature).
- All transmissions are encrypted (HTTPS).
3. Information collected automatically
The app uses the following third-party services (all Google):
| Service | Purpose | Data |
|---|---|---|
| Firebase Analytics | Usage analytics, product improvement | Anonymous usage events (which screens/features, counts), approximate region (from IP), device type and OS. Does not include your card content, images or translations (enums, counts and booleans only). |
| Firebase Crashlytics | Crash diagnostics | Technical crash info (device model, OS, stack traces). |
| Firebase Performance | Speed measurement | Performance metrics such as processing and response times. |
| Google AdMob | Ads in the free version | Advertising ID, ad impression/interaction data, approximate region. Ad personalization follows your consent (the consent screen / iOS tracking permission). |
Ads are shown only in the free version. Before ads appear, the app runs consent management (UMP) as required by your region, and on iOS shows App Tracking Transparency. If you decline, ads are non-personalized.
4. Friend referrals (optional)
Only if you use the referral feature, the app creates an anonymous account (Firebase Anonymous Auth — no name or email) and records a referral code and an anonymous ID for duplicate prevention in our Firebase (Firestore). No personally-identifying information is included. If you do not use referrals, this record is never created.
5. Children’s privacy
The app is intended for a general audience and does not knowingly collect personal information from children under 13 (or the age defined by your region).
6. Your choices and data deletion
- Deleting the app removes all study data from your device.
- You can change ad personalization at any time from your device’s ad settings or the app’s consent reset.
- To delete an anonymous referral record, contact us at the address below (identifying the anonymous ID is required).
7. Sharing with third parties
We do not sell or share your information with third parties except as needed to provide the services above (Google services). Each Google service handles data under Google’s own privacy policy.
8. Changes
If we update this policy, we will revise the “Last updated” date on this page.
9. Contact
Sakiparu — k2@saki-paru.com