Privacy Policy
Calyssa ("the App", "we", "us", "our"), operated by Tranquil Mind Technology JSC, respects your privacy. This Privacy Policy explains what information we collect, how we use and share it, and the choices and rights you have. By using the App, you agree to this Policy.
Calyssa is an entertainment app for streaming short romance and drama series in chapter-sized episodes. You do not need to create an account, and the App has no sign-in, profile, chat, or comment features.
1. Information we collect
We do not ask you to register or provide personal details to use the App. Some information is collected automatically to run the App, show advertising, and improve the experience:
- Device and advertising identifiers (e.g. the Android advertising ID, app instance IDs assigned by our analytics and subscription providers) and general device information such as model, operating system version, and language.
- Approximate location derived from your IP address by our advertising partners for ad targeting and measurement. This is not precise GPS location — the App requests no location permission and cannot access your GPS.
- App activity and diagnostics, such as which screens you open, which series and episodes you view, feature usage, ad interactions, and crash and performance logs.
- Purchase status, i.e. whether you hold an active Calyssa VIP subscription. Payments are processed by Google Play and validated through our subscription provider; we never receive your card or bank details.
- Device integrity and security signals, such as whether the device appears to be rooted, whether the App has been tampered with or repackaged, and whether an instrumentation or hooking framework is present. These are used to protect the App and our content library from abuse.
Stored only on your device, and never sent to us: your in-app coin balance, your viewing progress and bookmarks, your saved and recently-opened series, your chosen interface language, and your subtitle preference.
2. How we use information
- Provide and operate the App and its video player.
- Remember your viewing progress, saved series, and coin balance on your device.
- Show and measure advertising, including rewarded ads that grant in-app coins or temporarily pause ads.
- Analytics, diagnostics, and improving stability, content, and the experience.
- Configure features remotely (for example enabling or disabling ad placements).
- Process and validate purchases and subscriptions, and restore them on a new device.
- Prevent fraud and abuse, and protect the security and integrity of the App and our content.
- Comply with legal obligations.
3. Third-party services
The App uses the following third-party services, which may receive data as described. Each is governed by its own privacy policy:
| Service | Purpose | Policy |
|---|---|---|
| Google Firebase (Analytics, Crashlytics, Remote Config, App Check) | Analytics, crash reporting, remote feature configuration, app attestation | https://firebase.google.com/support/privacy |
| Google AdMob | Advertising and measurement | https://policies.google.com/privacy |
| Meta Audience Network | Ad mediation | https://www.facebook.com/about/privacy |
| Pangle | Ad mediation | https://www.pangleglobal.com/privacy |
| Mintegral | Ad mediation | https://www.mintegral.com/en/privacy |
| Unity Ads | Ad mediation | https://unity.com/legal/privacy-policy |
| Liftoff Monetize (Vungle) | Ad mediation | https://liftoff.io/privacy-policy/ |
| Adjust | Install attribution and marketing analytics | https://www.adjust.com/terms/privacy-policy |
| RevenueCat | Subscription management and purchase validation | https://www.revenuecat.com/privacy |
| Google Play Billing | Payments and subscriptions | https://policies.google.com/privacy |
| Talsec (freeRASP) | App integrity, anti-tampering, and abuse prevention | https://www.talsec.app/privacy-policy-talsec-app |
Ad consent (UMP). Where required (e.g. in the EEA and the UK), we present a consent request through Google's User Messaging Platform before showing personalized ads. You may change your choice later in the App.
Reset or opt out of the advertising ID. You can reset or delete your advertising ID at any time in your device settings (Android: Settings → Google → Ads). Deleting it stops personalized advertising from using it.
4. How we share information
We do not sell your personal information for money. We share data with the third-party services listed in Section 3 to operate the App, show and measure ads, and process purchases; for legal reasons; and in connection with a business transfer. Where ads are personalized, some U.S. state laws treat the resulting transfer of identifiers as a "sale" or "sharing" of personal information for targeted advertising, and you may opt out as described in Section 7 and by using the ad-consent and advertising-ID controls described in Section 3.
5. Legal bases (EEA/UK — GDPR)
- Consent — personalized advertising, and analytics where consent is required.
- Legitimate interests — core functionality, security and anti-fraud, and improving the App.
- Contract / legal obligation — processing and validating purchases and subscriptions, and meeting our legal duties.
6. Data retention
We keep information only as long as necessary for the purposes above or as required by law. Advertising, attribution, and analytics partners retain identifiers according to their own policies. Crash and diagnostic data are kept for a limited period. Data stored only on your device is removed when you delete the App.
7. Your rights
- GDPR (EEA/UK): access, correct, delete, port, object, restrict, and withdraw consent; and lodge a complaint with a data protection authority.
- CCPA/CPRA (California): know, delete, correct, and opt out of the sale/sharing of personal information and of targeted advertising, without discrimination.
- Other regions (LGPD, PIPEDA, and similar laws): equivalent rights may apply.
Because the App has no user accounts, we cannot identify you by name. To exercise a right, contact us at the address in Section 13 and include your advertising ID and device details so we can locate and action your request. You can also clear all locally-stored data at any time by uninstalling the App.
8. Children's privacy
The App is intended for users aged 16 and older and is not directed to children. We do not knowingly collect personal information from children, and we do not knowingly serve ads based on personal information collected from children. If you believe a child has provided information to us, contact us and we will delete it.
9. International data transfers
Your information may be processed outside your country, including in the United States. Where required, we use appropriate safeguards (e.g. Standard Contractual Clauses).
10. Data security
We use encryption in transit (HTTPS/TLS) for all data the App sends, together with app attestation and integrity checks and other reasonable measures to protect your information. No method of transmission or storage is 100% secure.
11. Third-party content
The App streams video series supplied by their respective rights holders, and may link to third-party websites. We are not responsible for third-party content or for the privacy practices of the sites we link to; please review their policies.
12. Changes to this Policy
We may update this Policy. Material changes will be posted with a new date; continued use of the App means you accept the updated Policy.
13. Contact us
Tranquil Mind Technology JSC
No. 3, Alley 98, Vu Trong Phung Street, Thanh Xuan Ward, Hanoi City, Vietnam
Email: contact@tranquilmind.co
© 2026 Tranquil Mind Technology JSC (@Tranquil Mind Technology JSC). All rights reserved.