Privacy Policy

Last updated: August 16, 2026

Introduction

SubLingo ("we", "our", or "us") is committed to protecting your privacy. This Privacy Policy explains how we collect, use, and safeguard your information when you use the SubLingo mobile app for iOS and Android, the SubLingo browser extension, our website, or any related services (collectively, the "Service").

By using SubLingo, you agree to the collection and use of information in accordance with this policy. Where a section applies only to the mobile app or only to the browser extension, it says so.

Information We Collect

Account Information. If you create an account or subscribe to Premium, we collect:

  • Email address
  • Authentication provider information (e.g., if you sign in via GitHub or Google)
  • Subscription and payment status. Purchases made in the mobile app are processed by Apple or Google and relayed to us by RevenueCat; purchases made on our website are processed by LemonSqueezy. In neither case do we receive or store your card number.

Usage Data. We may collect anonymous, aggregated usage statistics such as:

  • Number of translations performed
  • Languages selected
  • Feature usage patterns

Vocabulary Data. Words and phrases you save to your vocabulary list are stored locally on your device by default. If you enable cloud sync (Premium feature), this data is stored on our servers and synced across your devices.

Extension Settings. In the browser extension, your preferences (language pair, subtitle style, disabled sites) are stored locally via Chrome's storage APIs and optionally synced across your browser instances using Chrome's built-in sync.

App Settings. In the mobile app, your preferences (language pair, daily review target, reminder time, appearance) are stored locally on your device.

Screen Time (iOS only). If you turn on the review lock, the app uses Apple's Screen Time and Family Controls frameworks to show a reminder screen until your reviews are done. The selection of apps you choose to lock is handled by iOS and stays on your device. We never see it and it is never sent to our servers.

Information We Do Not Collect

  • We do not collect or store the content of videos you watch
  • We do not track your browsing history or the URLs you visit
  • We do not collect or store subtitle content beyond what is needed for real-time translation
  • We do not sell, rent, or share your personal information with third parties for marketing purposes

How We Use Your Information

  • To provide and maintain the Service, including real-time subtitle translation
  • To manage your account and subscription
  • To sync your vocabulary and settings across devices (if enabled)
  • To improve and optimize the Service
  • To communicate with you about updates, support, or changes to the Service

Data Storage & Security

Most data is stored locally on your device — in the browser extension using Chrome's storage APIs, and in the mobile app using a local database on the device itself. Cloud-synced data (for Premium users) is stored on secure servers provided by Supabase, with encryption in transit (TLS) and at rest.

We implement industry-standard security measures to protect your data, but no method of electronic storage is 100% secure. We cannot guarantee absolute security.

Third-Party Services

SubLingo may interact with the following third-party services:

  • Translation APIs — Text you ask us to translate is sent to translation services. No personally identifiable information is included in these requests.
  • Apple and Google — Process purchases made inside the mobile app through the App Store and Google Play. Their privacy policies govern payment data.
  • RevenueCat — Tells the mobile app whether your Premium purchase is active. It receives a purchase identifier, not your payment details.
  • LemonSqueezy — Handles payment processing for Premium bought on our website. Their privacy policy governs payment data.
  • Supabase — Provides authentication and cloud storage for Premium features.

Your Rights

You have the right to:

  • Access the personal data we hold about you
  • Request correction of inaccurate data
  • Request deletion of your data and account
  • Export your vocabulary data at any time
  • Opt out of cloud sync and keep all data local

To exercise any of these rights, contact us at support@sublingo.pro.

Children's Privacy

SubLingo is not intended for children under the age of 13. We do not knowingly collect personal information from children. If you believe a child has provided us with personal data, please contact us and we will promptly delete it.

Changes to This Policy

We may update this Privacy Policy from time to time. We will notify you of any material changes by posting the updated policy on this page and updating the "Last updated" date. Continued use of the Service after changes constitutes acceptance of the updated policy.

Contact Us

If you have any questions about this Privacy Policy, please contact us at support@sublingo.pro.