PRIVACY POLICY - SYNANTO
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Effective Date: February 19, 2026
Last Updated: February 19, 2026
1. INTRODUCTION
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Synanto ("we," "our," or "us") is a mobile vocabulary application for iOS and Android that helps users learn synonyms and antonyms through quizzes and daily challenges. This Privacy Policy explains what information we collect, how we use it, and your rights regarding that information.
By using Synanto, you agree to the practices described in this policy.
2. INFORMATION WE COLLECT
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2.1 Information You Provide
The following information is collected only if you optionally create an account:
- Email address: Used for authentication only (via Supabase Auth)
- Username: Displayed on leaderboards
- Password: Stored as a secure hash — we never store plaintext passwords
Account creation is entirely optional. The app is fully functional without an account.
2.2 Data Stored Locally on Your Device
The following data is stored only on your device (via SQLite and AsyncStorage) unless you create an account and choose to sync:
- Search history — words you have looked up
- Favorite words — your saved word bank
- Quiz progress — XP, level, current streak, longest streak, challenge results
- Achievements / badges — badges you have unlocked
- App settings — theme, difficulty, sound, haptics, notifications, reduced motion preferences
- Cached daily challenges — fetched for offline use
2.3 Information Collected Automatically
Analytics (PostHog)
We use PostHog to understand how the app is used and to improve it. PostHog collects:
- Events (e.g., challenge started, quiz completed, screen viewed)
- Session information (session duration, feature usage frequency)
- Device type and operating system version
- App version
PostHog data is pseudonymous — it is not linked to your name or email. You can opt out of analytics in the app Settings.
Advertising (Google AdMob)
The free version of Synanto may display ads served by Google AdMob. AdMob may collect:
- Advertising identifier (IDFA on iOS, GAID on Android) — used to serve relevant ads
- Device information (model, OS version)
- General location (country/region level, derived from IP address)
- Ad interaction data (impressions, clicks)
On iOS, we request your permission via Apple's App Tracking Transparency (ATT) prompt before collecting your advertising identifier. You may decline, and the app will continue to function with non-personalized ads.
On Android, AdMob uses the Google Advertising ID (com.google.android.gms.permission.AD_ID).
You can reset or opt out of personalized ads through your device settings:
- iOS: Settings > Privacy & Security > Tracking
- Android: Settings > Google > Ads
Push Notifications
If you grant permission, we send push notifications via Expo Notifications, including:
- Word of the Day — one notification each morning with a featured word
- Streak Reminders — an evening reminder to complete your daily challenge
Push notification tokens are stored in our backend (Supabase) to deliver these messages. You can disable notifications at any time in the app Settings or your device's notification settings.
2.4 Cloud Data (Signed-In Users Only)
If you create an account and sign in, the following data is synced to our backend (Supabase / PostgreSQL):
- Account information: username, email, avatar URL
- Progress data: XP, level, current and longest streak, last active date
- Challenge results: mode, difficulty, score, time taken, date played
- Achievements: badge keys and unlock timestamps
- Daily Challenge scores: used for global leaderboards
This data is stored securely in our Supabase database hosted in the United States, protected by Row Level Security (RLS) policies that ensure you can only access your own data.
3. HOW WE USE YOUR INFORMATION
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- Provide core app functionality (word lookup, quizzes, streak tracking)
Basis: Performance of the service
- Sync your progress across devices (signed-in users)
Basis: Your consent (account creation)
- Display global leaderboards
Basis: Legitimate interest, with your participation
- Send Word of the Day and streak reminder notifications
Basis: Your explicit consent (notification permission prompt)
- Serve advertisements (free tier)
Basis: Legitimate interest / your consent (ATT prompt on iOS)
- Analyze app usage to improve features
Basis: Legitimate interest
- Enforce our Terms of Service and prevent abuse
Basis: Legitimate interest
4. DATA SHARING
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We do not sell your personal data. We share data only with the following trusted service providers:
- Supabase: Backend database and authentication
Data: Account info, progress, challenge results
- PostHog: Product analytics
Data: Pseudonymous usage events
- Google AdMob: Advertising (free tier)
Data: Advertising ID, device info
- Expo: Push notification delivery
Data: Notification token
- Apple / Google: App distribution, Sign-In with Apple / Google Sign-In
Data: Authentication tokens only
We may also disclose data if required by law or to protect the rights and safety of users.
5. DATA RETENTION
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- Local device data: Until you uninstall the app or clear app data
- Cloud account data: Until you delete your account, plus 30 days for backups
- Analytics events: 12 months (PostHog free tier)
- Ad interaction data: Controlled by Google — see https://policies.google.com/privacy
- Push notification tokens: Until you disable notifications or delete your account
6. CHILDREN'S PRIVACY
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Synanto is rated Everyone (Google Play) and suitable for all ages. We do not knowingly collect personal information from children under 13 (or the applicable age of digital consent in your jurisdiction). If you believe we have inadvertently collected data from a child, please contact us and we will delete it promptly.
Because the app may be used by children, we display non-personalized ads by default and request ATT consent appropriately.
7. YOUR RIGHTS
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Depending on your location, you may have the following rights:
- Access: Request a copy of the data we hold about you
- Correction: Request correction of inaccurate data
- Deletion: Request deletion of your account and associated data
- Data portability: Request your data in a portable format
- Opt-out of analytics: Disable analytics tracking in Settings > About
- Opt-out of personalized ads: Via device settings (see Section 2.3)
- Withdraw notification consent: Via app Settings or device notifications settings
California residents (CCPA): You have the right to know, delete, and opt out of the sale of personal information. We do not sell personal information.
EU/UK residents (GDPR): You may exercise the rights above by contacting us. You also have the right to lodge a complaint with your local data protection authority.
To exercise any of these rights, contact us at the email below.
8. SECURITY
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We implement industry-standard security measures, including:
- HTTPS/TLS encryption for all data in transit
- Supabase Row Level Security (RLS) ensuring users only access their own data
- Passwords stored as secure hashes (never in plaintext)
- Credentials stored securely using expo-secure-store (iOS Keychain / Android Keystore)
No method of electronic storage or transmission is 100% secure. We cannot guarantee absolute security, but we are committed to protecting your data.
9. THIRD-PARTY LINKS AND SERVICES
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Synanto may allow you to share quiz results to social media platforms. Once you leave the app, those platforms' own privacy policies govern the use of your data. We are not responsible for the privacy practices of third-party services.
10. CHANGES TO THIS POLICY
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We may update this Privacy Policy from time to time. When we do, we will update the "Last Updated" date at the top of this document. For material changes, we will notify you within the app. Continued use of Synanto after the effective date constitutes your acceptance of the updated policy.
11. CONTACT US
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If you have any questions, concerns, or requests regarding this Privacy Policy, please contact us:
App: Synanto: Synonym & Antonym
Email: perveroglubaris@gmail.com