Remember it on exam day,
not just tonight
FSRS brings every card back right before you’d forget it. You just study what’s due.
- FSRS scheduling on every card
- No intervals to set
- One daily queue
- Free on every plan
Free to start · no credit card required
24 due today
- Cell biology11 due
- Organic chemistry8 due
- Spanish vocab5 due
The science
Review at the edge of forgetting
Memory fades fast. Each well-timed review resets it, and it fades slower every time.
Each review buys you more time
One card’s journey. FSRS tunes the real gaps to your ratings.
Four buttons. That’s the whole setup.
Rate how well you recalled it and the next review reschedules instantly.
Back in minutes
A shorter gap
Right on schedule
Pushed further out
Every deck, one queue
Web, iOS & Android
Image occlusion cards
ProFAQ
Spaced repetition, answered
FSRS (Free Spaced Repetition Scheduler) is a modern algorithm that models how fast you forget each card and times its next review just before that happens.
No. Rate each card Again, Hard, Good or Easy and FSRS works out when it comes back.
Yes. FSRS schedules every card on every plan, Free and Pro.
Nothing breaks. Overdue cards stay in your queue and the schedule adjusts as you review them.
Yes. Review on web, iOS or Android and your schedule stays in sync.
Explore more
Works better with the rest of ClassFactor
Study smarter. Reach your goals.
Upload your materials and get the tools, support, and structure you need to learn better, improve your grades, and stay on track.
- No credit card required
- Free to start
- Study smarter. Improve your grades.
