Free & open source

Create cards.
Review smarter.
Remember more.

Free, open-source flashcards that schedule each review for the right time, work offline, and sync across the web, iOS, and Android. Use AI when you want help creating or improving cards.

No credit card. No ads. No trial countdown.

FOR PEOPLE

Web App

FOR AI AGENTS

Connect your AI agent over MCP: add the Flashcards server to Claude, Cursor, or any MCP client and it can read, create, and edit your cards.

Add this MCP server to your AI client:

https://mcp.flashcards-open-source-app.com/mcp

APP PREVIEW

Flashcards app screens showing review, answer results, progress, AI draft, and card list flows.

Activity

Flashcards activity

See aggregate daily review activity across web, iOS, and Android. Published figures are aggregate counts and do not expose card content, email addresses, or individual study histories.

View raw data (JSON)

Total reviews

41,272

Reviewers

351

Days in range

176

Peak daily volume

1,370

Peak daily unique users

Daily reviewers: new vs returning

Reviewers are grouped as new on their first review day or returning if they reviewed before. A review is counted when someone chooses Again, Hard, Good, or Easy on a card.

ReturningNew

Review date

Daily reviews by platform

A review is counted when someone chooses Again, Hard, Good, or Easy on a card. Counts are grouped by platform.

WebAndroidiOS

Review date

Smarter Reviews with FSRS

Review the cards that are due today. FSRS brings difficult cards back sooner and waits longer before showing familiar ones again.

AI-Assisted Card Creation

Ask AI to help create cards, improve their wording, or clarify an answer. You stay in control of what gets saved.

Offline Study with Automatic Sync

Keep reviewing on your mobile device without an internet connection. Changes sync automatically so you can continue on the web, iOS, or Android.

Import, Export, and Own Your Data

Move your learning materials in or out whenever you like. Portable exports include your cards, tags, and related media.

Works with AI Agents

Connect through MCP or the Agent API so AI agents can help create, improve, and organize your cards.

Free and Self-Hostable

Use the hosted app for free, inspect the open-source code, or run it on your own infrastructure.

Create cards.Review smarter.Remember more.