FermemoIt reminds you just before you forget
Fermemo uses the proven SM-2 spaced repetition algorithm. It learns how easily you remember each note and schedules the next review for exactly the right day.
Beat the forgetting curve
In 1885, Hermann Ebbinghaus showed that most newly learned information is forgotten within a few days. Every well-timed review slows that decline.
Every review lifts the curve
Without review, recall drops fast. If you review once just as you're about to forget, the memory is refreshed and the next round of forgetting is slower.
That's why the intervals keep getting longer: far fewer reviews are enough to make the same knowledge stick.
Lasting learning in 4 steps
You take notes and grade yourself honestly; Fermemo takes care of the timing.
Take a note
Write the note and turn on Remember. It joins your review list; you can do the first review right away.
Review when it's due
Notes that are due gather on the Review screen. You can also get browser and phone notifications.
Choose how well you remembered
Try to recall the note, then look at the content and pick one of the four buttons.
The interval is recalculated
Your choice updates the day of the next review and the note's ease score. And so the cycle continues.
Four buttons, four different outcomes
Every note has an ease score (it starts at 2.5 and never goes below 1.3). Your choice changes both the next interval and this score.
😰 Couldn't remember
The note starts over and comes back tomorrow.
- Next review in 1 day
- Ease score −0,80
😓 With difficulty
The interval grows, but the note now counts as harder; later intervals grow more slowly.
- Next review moves further out
- Ease score −0,14
🙂 Remembered
The usual choice. The interval grows and the ease score stays the same.
- Next review moves further out
- Ease score ±0
😎 Effortlessly
The note counts as easy; from now on the intervals grow faster.
- Next review moves further out
- Ease score +0,10
If you answer "Good" every time
The first three reviews come at fixed intervals (1, 3 and 6 days). After that, each interval is the previous interval × the ease score.
Just 6 reviews in about 5 months in total. Pick "Easy" and the intervals grow faster; pick "Hard" and they grow more slowly; "Forgot" sends the note back to the start.
Pretend you're reviewing a note
Press the buttons and see how the algorithm changes the interval. It's the exact calculation the app uses.
Review history
No reviews yet. Press one of the buttons on the left.
Formula
For the curious: Fermemo uses Piotr Woźniak's SM-2 algorithm.
Interval
Forgot → interval = 1 day, streak = 0
1st successful review → 1 day
2nd successful review → 3 days
3rd successful review → 6 days
after that → interval × ease score
The result is rounded to the nearest whole day.
Ease score (EF)
EF' = EF + 0.1 − (5 − q) × (0.08 + (5 − q) × 0.02)
EF' is at least 1.3
q: Forgot = 0, Hard = 3, Good = 4, Easy = 5. New notes start at EF = 2.5.
For the best results
A few minutes every day
Don't let due notes pile up. Short, regular reviews work far better than long, occasional ones.
Grade honestly
If you didn't remember, say "Forgot". The algorithm can only pick the right moment if it knows where you really stand.
Keep notes small
Put one idea in each note. Short notes are easier to remember and easier to grade accurately.
Add a hint
If you write a hint for a note, the hint is shown first during review, and you try to recall the content from it.
Turn on notifications
Turn on notifications in Settings and you'll be alerted on your phone or browser when a review is due.
Sort into categories
Create categories by topic; you can review just one topic whenever you like.
Stop forgetting, start remembering
Create a free account and write your first note; Fermemo will remember the rest.