Openlet
Openlet is a free, open-source flashcard and study tool for students, available on the web or self-hosted.
What Openlet is
Openlet is a free, open-source flashcard and study tool for students, available on the web or self-hosted. Its five study modes—Flashcards, Learn, Write, Match, and Test—are all included without ads or an upgrade wall. Learn uses FSRS spaced repetition, bringing difficult cards back sooner and leaving easier cards longer between reviews. Students can import decks 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, while the site describes signup as creating a free account. A production deployment requires a Supabase project for data and authentication. The project asks people reporting security vulnerabilities to contact it by email rather than posting public GitHub issues, and says reports receive acknowledgment within 48 hours. Security updates cover the latest version running on master; older commits are unsupported.
Good
- All five study modes are free.
- Learn mode uses FSRS spaced repetition.
- Decks can be imported from CSV or pasted content.
- Users can export decks anytime.
- MIT-licensed source can be self-hosted.
Watch out
- Production data and authentication require a Supabase project.
- Older commits are unsupported for security updates.
Who it suits
Openlet suits students who want free flashcards, multiple study modes, and spaced repetition. It also fits people who want to self-host an open-source study app, provided they can supply a Supabase project for production data and authentication.
Verdict
Openlet offers a useful set of free study modes alongside import, export, and FSRS scheduling. Self-hosters should account for the Supabase requirement for production and the project’s security-update policy.
Plans and prices
From Openlet's own pricing page, checked 10 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Free | Free | All five study modes · No ads · No upgrade wall |
The facts
Each one read from Openlet's own pages, with the date it was checked.
What it does
- Account
- The site describes signup as a free account.checked 10 Oct 2026
- Export
- The site says users can export decks anytime.checked 10 Oct 2026
- Import
- Users can import decks from CSV or paste content.checked 10 Oct 2026
- Infrastructure
- The repository says production data and authentication require a Supabase project.checked 10 Oct 2026
- Purpose
- Openlet is a free, open-source flashcard and study tool for students.checked 10 Oct 2026
- Security reporting
- The project asks vulnerability reporters to use email rather than public GitHub issues and says it will acknowledge reports within 48 hours.checked 10 Oct 2026
- Self-hosting
- The site says its MIT-licensed source can be self-hosted.checked 10 Oct 2026
- Source repository
- The project repository describes Openlet as an open-source flashcard application with FSRS spaced repetition, deck creation and import, image occlusion, folders, sharing, and account-backed synchronization.checked 10 Oct 2026
- Spaced repetition
- The site says Learn uses FSRS so difficult cards return sooner and easy cards wait longer.checked 10 Oct 2026
- Study modes
- It offers Flashcards, Learn, Write, Match, and Test modes, which the site says are all unlocked for free.checked 10 Oct 2026
- Supported version
- The security policy says it provides security updates for the latest version running on master; older commits are unsupported.checked 10 Oct 2026
Money
- Free plan
- Yeschecked 20 Sep 2026
The company
- Maker
- The GitHub profile identifies ChloeVPin as Chloe, an independent software builder in Los Angeles.checked 10 Oct 2026
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