Openlet

What Openlet is

Openlet is a free, open-source flashcard and study tool for students, available as a web app or for self-hosting. Its free plan includes Flashcards, Learn, Write, Match and Test, with no ads or upgrade wall. Learn uses FSRS spaced repetition: difficult cards are scheduled to return sooner, while easier ones wait longer. Students can create decks, import them from CSV or pasted content, and export decks at any time. The project repository also describes image occlusion, folders, sharing and account-backed synchronization. Openlet’s source is MIT-licensed and can be self-hosted; the site describes signup as creating a free account. For production use, the repository says a Supabase project is needed for data and authentication. The project requests security vulnerability reports by email rather than through public GitHub issues and says it acknowledges reports within 48 hours. Its security policy covers the latest version running on master; older commits are unsupported.

Who it suits

Openlet suits students who want several ways to practise from flashcard decks without paying for the listed plan. It may also suit people who want to self-host an open-source study tool and can provide a Supabase project for production data and authentication.

Limits

The Free plan costs nothing and includes all five study modes, with no ads or upgrade wall. Production self-hosting requires a Supabase project for data and authentication.

Getting started

1. Open the web app at https://github.com/ChloeVPin/openlet.
2. Sign up by creating a free account.
3. Create a deck or import one from CSV or pasted content.
4. Choose Flashcards, Learn, Write, Match, or Test to study.
5. Export decks whenever needed, or self-host the MIT-licensed source; a production deployment requires a Supabase project.

Verdict

Openlet offers a free set of study modes, spaced repetition and deck import and export. Self-hosters should note the production Supabase requirement and the policy’s support boundary for security updates.