AI-powered open-source flashcards app for iOS, Android, and web.
Flashcards Open Source App is an open-source AI-powered flashcards app built for serious daily study on iOS, Android, and the web. Use it to prepare for exams, learn vocabulary, memorize technical terms and facts, improve your material with AI, and review with spaced repetition. The project also includes an external agent API for terminal and AI-agent workflows.
- iOS
- Android
- Web
- MCP server: https://mcp.flashcards-open-source-app.com/mcp
- Agent API: https://api.flashcards-open-source-app.com/v1/
Card scheduling uses FSRS-based spaced repetition. Detailed scheduling rules live in docs/fsrs-scheduling-logic.md.
The hosted MCP server is available at https://mcp.flashcards-open-source-app.com/mcp and is listed in MCP registries as com.flashcards-open-source-app/flashcards. It exposes seven tools, most of them workspace-scoped: list_workspaces, sql_query, sql_execute, get_guide, next_review_card, reveal_answer, and submit_review.
The dedicated review tools support one-question-at-a-time conversations and idempotent FSRS scheduling. See conversational reviews for the contract shared by MCP, the in-app chat, and the Agent API, and for voice-session examples. ChatGPT Voice currently does not invoke apps/MCP; these tools do not remove that external limitation.
Interactive clients authenticate with OAuth 2.1 authorization code + PKCE and Dynamic Client Registration. Headless clients can use an fca_ Bearer token.
- iOS app
- Android app
- Web app
- Architecture
- Backend and web deployment
- Public site URLs (
PUBLIC_SITE_BASE_URL) - Release gates and monitoring
- Manual production release
- iOS local setup
- iOS CI/CD
- Android CI/CD
- Agent API
This project is licensed under the MIT License - see the LICENSE file for details.