Privacy Policy

Last updated: January 24, 2026

BrainLet ("we", "our", or "us") is a private project committed to protecting your privacy. This policy explains how we collect, use, and safeguard your information when you use our flashcard learning service.

Information We Collect

Account Information

  • Email address (required for registration)
  • Username (public display name)
  • Password (stored as secure hash, never in plain text)
  • Google ID (if you sign in with Google)
  • Avatar preferences

Usage Data

  • Learning sessions and progress
  • Learning events (card views, answers)
  • Favorite cards and sets
  • Study set subscriptions

Cookies

We only use essential cookies required for the service to function. We do not use tracking or advertising cookies.

  • jwt_token— Authentication token (HttpOnly, 30 days). Used to keep you logged in.
  • locale— Interface language preference (1 year). Remembers your language choice.
  • sort_*— Sorting preferences. Remembers how you prefer to sort lists.

Third-Party Services

Plausible Analytics

We use self-hosted Plausible Analytics for privacy-friendly website analytics. It does not use cookies and does not collect personal data.

Google OAuth

If you choose to sign in with Google, we receive your email and basic profile information from Google to create your account.

Pexels / Unsplash

When searching for card images, we use Pexels and Unsplash APIs. These services may collect anonymous usage statistics.

OpenAI

We use OpenAI to provide AI-powered features like card classification and usage examples. Card content may be processed by OpenAI's API.

MeiliSearch

Search functionality is powered by MeiliSearch, which indexes your public study sets to enable search.

Data Security

We implement industry-standard security measures to protect your data. Passwords are hashed using secure algorithms. All data is transmitted over HTTPS. We regularly review and update our security practices.

Your Rights

  • Access your personal data through your account settings
  • Delete your account and all associated data at any time
  • Export your study sets and learning data
  • Update or correct your personal information

Contact Us

If you have questions about this Privacy Policy or your data, please contact us at support@brainlet.app