Modern scheduling
FSRS models memory stability and difficulty per card, so you do fewer reviews to reach the same retention.
Review
Make it stick.
Turn notes into flashcards and review them on a schedule. Concrete uses the FSRS algorithm to space each card based on how well you remembered it last time.
- Scheduler
- FSRS
- Ratings
- Again · Hard · Good · Easy
- Cards
- Created from notes
- Decks
- By folder, tag, or note
Review · Linear Algebra · 12 due
Front
What does it mean for vectors to be linearly independent?
Back
No vector in the set is a linear combination of the others.
Illustration in the Concrete theme
How it works
Three steps.
- 1
Create
Generate cards from a note, or write them yourself in the card editor.
- 2
Review
Each day, review only the cards that are due.
- 3
Rate
Rate your recall. FSRS updates the card's stability and picks the next interval.
Why it matters
Cards live with notes
Each card stays linked to its source note, so the context is always one click away.
Quiz or review
Switch between quiz mode and flashcard review from the same panel.
Next — 05
Agents →
Codex or Claude agents that work in your vault.