Recall
Review the two topics you are about to forget, not the chapter you already know.
9:41
Today
Memory
Mocks
Topics
9:41
53Today
Memory
Mocks
Topics
Spaced repetition for the
State PCB Entrance
State PCB Entrance
1,140 cards, all offline
Divya Rajendran, 17, Coimbatore. Class 12, 117 days to the entrance.
She read one chapter five times in a week. The marks went to the chapter she never came back to.
Chemical kinetics, pages 118 to 131
Five reads in seven days. Each one felt like progress.
Mock 07 · Q54Electrochemistry
Write the Nernst equation for a Daniell cell at 298 K and state what happens to the cell potential as the zinc ion concentration rises.
Left blank0 of 4
She last opened Electrochemistry on 14 August. Nothing since then told her it was going.
151days since that chapter was last opened. Four of the five topics she lost marks on were in the same state.
Eighty-four cards, and not one of them is a chapter you already know.
Built overnight from each card's curve, never from the syllabus order.
9:41
53Today
Memory
Mocks
Topics
Twelve new, eighteen still learning, fifty-four true reviews84 due, 31 answered, 24 minutes in
Real Class 12 material, one idea per cardFront, answer, and the four times she has seen it
Each rating shows the date it buys youGood sends this card to 15 January
Every topic has a curve. Recall reviews it just before it hits the floor.
9:41
Today
Memory
Mocks
Topics
Current electricity
29 cards · Physics
66%
strength
Crosses 60% tomorrow evening. Five cards move into tomorrow's queue.
Four topics, four curves, one floorDots are the reviews that lifted them back up
s(t) = exp(-t / tau)
review when s = 0.60, then tau x e
review when s = 0.60, then tau x e
Strength is modelled, not guessed. Nobody types in a date, and nothing is scheduled by chapter order.
Three hours, ninety questions, then the honest part.
9:41
Today
Memory
Mocks
Topics
11:18
192 out of 360, with the arithmetic shown54 right, 24 wrong, 12 left blank
The palette keeps track, so you don't31 answered, 5 flagged, 53 not seen
+4 correct, -1 wrong
Physics30 q68 min
Chemistry30 q54 min
Biology30 q51 min
Five topics took 49 minutes of the paper and gave back nothing.
Ranked by accuracy across the last four mocks, then by the time each one ate.
Where the 49 minutes wentof 180
Questions that scoredWrong or left blank
Rotational motion5/1314 min
Thermodynamics4/99 min
Electrochemistry5/1011 min
Human reproduction6/117 min
Ray optics7/128 min
If a topic is still under half after three plans, Recall stops rescheduling it and says to take it to your teacher.
1,140 cards and 8 papers on the phone · 42 MB
9:41
Today
Memory
Mocks
Topics
The ranking becomes seven evenings345 minutes, ending with Mock 08 on Saturday
One card · 96 days · six reviews
A review does not top you up. It makes the next fall slower.
day 0day 33day 96
The floor is 60%
The card comes back the day recall is modelled to reach the point where it starts to cost you.
Stability times e
Every review you answer well multiplies the decay constant by e, so the interval grows on its own.
1, 3, 8, 21, 55
That multiplication is the whole ladder. Nobody picks the dates; the curve does.
RecallEvery date in the app comes out of this one curve
Recall
On the night before,
there is nothing
left to cram.
there is nothing
left to cram.
Twenty minutes a day for 96 topics, spaced so nothing slips.A Goat Scale concept
Recall1,140 cards in the syllabus
84
are the only ones
going soft tonight.
going soft tonight.
Seven per cent of the syllabus, chosen at 5 am by each card's own curve. The other 1,056 can wait, and Recall knows until when.
Works offline on a cheap phoneA Goat Scale concept
Recall design system
One accent. Two colours that only ever mean a memory is slipping or gone.
Ink
#070A0F
Panel
#101724
Raised
#19222F
Signal cyan
#38DDF2
Paper
#E7EEF6
Slipping
#F0C45C
Gone
#FF5C7A
Archivo — display and every word of UI
Aa
Headline 700, -3.5% tracking
UI 600 · body 400
nothing under 14 px
UI 600 · body 400
nothing under 14 px
Weak topics
Ranked by accuracy across the last four mocks
Sentence case everywhere. Buttons say what they do: Save and next, Add, See all 7.
Roboto Mono — anything you would read off a clock
1:52:07
0123456789
192 / 36084 due66%55 d14 min lost42 MB
Unslashed zeros and tabular widths, so a timer never jitters.
The one chart, at any size
s(t) = exp(-t / tau)
review at s = 0.60, then tau x e
review at s = 0.60, then tau x e
Components
Again10 min
Hard1 d
Good3 d
Easy5 d
84 due12 slipping
34353637383940
Icons, 24 px grid, 1.8 stroke
Cyan marks the live tab and the one action per screen. Rose is only ever a lost memory or a wrong answer.
Subjects
412386342
Drawn marks, never letters in a circle. Tinted by the topic's current strength.
Recall · spaced-repetition exam prep concept · 4 screensDesigned by Goat Scale