euclid@flashcards ~ % spaced repetition scheduling
FC
Part of the Euclid Suite

Study cards that write themselves.

Euclid Flashcards turns your own notes and paper highlights into spaced-repetition cards automatically — so review time is spent recalling, not writing questions.

What triggers a Durable Object migration?
A change to its class definition
againhardeasy
Features

Review built on what you already wrote

No separate deck to maintain — your notes are the source material.

Auto-generated cards

Turns highlighted lines and note headers into question-answer pairs automatically.

Spaced repetition

An adaptive scheduler resurfaces cards right before you'd naturally forget them.

Linked back to source

Every card links back to the note or paper it came from, in one tap.

Deck organization

Cards group themselves by topic tag, so review sessions stay focused.

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Progress tracking

See retention trends per deck so you know what actually needs more review.

Offline review

Study sessions work fully offline and sync progress once you're back online.

How It Works

From highlight to habit

Highlight or write a note

Anything flagged in Euclid Notes or Euclid PDF Reader becomes card material.

Cards generate automatically

Euclid Flashcards drafts question-answer pairs — edit any of them before your first review.

Review daily

A short daily session keeps everything scheduled by the spaced-repetition algorithm.

Track retention

See which topics are sticking and which need a deeper second pass.

Free & Open Source

Turn your notes into knowledge that sticks

Euclid Flashcards is free, open-source, and available on desktop, web, tablet, and mobile.