I kept forgetting what I studied. So I built an app that remembers for me.

Re:Call tells you exactly what to revise and when, so what you learn this week is still there on exam day. It runs on Mac and Windows, and it took one very long day to make.

By Ishan Pratap Singh · Class 12 · 4 min read

Re:Call's Today screen: a study-time check-in and a list of six topics to revise, with tick and cross buttons — The Today screen: every morning, a short list of exactly what to revise.

Every week I'd study something new. A Physics chapter on Monday, Chemistry on Tuesday, Maths on Wednesday. And every week I'd tell myself the same thing: "I'll revise all of it on Sunday."

MonPhysics

TueChem

WedMaths

ThuEnglish

FriPhysics

SatChem

SunAll of it

It never worked. By Sunday, Monday's topic was mostly gone, so I wasn't revising it, I was learning it again. Six days of material didn't fit into one evening. And the week after, there were two weeks to catch up on. Topics from September were simply gone by November.

Revision isn't one day a week. It's a cycle you repeat for every topic, at the right gaps. Nobody can track that by hand for hundreds of topics.

So on Saturday, 31 October, I sat down and built the thing I wished I had. By the end of the day it was a finished, packaged app, made for my own board exams in February.

What it does

You add a topicRight after studying it: subject, chapter, and the pages you covered. Ten seconds.

It picks the dayFirst reminder 1 hour later, then right before you'd forget. Every morning you get a short to-do list.

You tap how it wentForgot, hard, good or easy. Easy topics come back later, hard ones sooner.

There are no flashcards to make. You revise from your own books; Re:Call just tells you which pages and when. Set your exam date and it squeezes everything to fit, ending with a final revision of every topic in the last week. Everything stays on your computer: no account, no internet, no ads.

Same effort, very different result

One topic, 30 days, four revisions either way. Revising every Sunday means re-learning it from scratch each time: you'd remember it on about 9 of the 30 days. Re:Call's timing catches it before it fades: you'd remember it all 30.

Illustration with a simple forgetting curve. The app itself uses FSRS-6, the memory model behind modern Anki, plus exam-date rules from a 2008 study of 1,350+ people (Cepeda et al.).

What's inside

Stats screen with a 101 days left countdown and a glowing grid of study days

A countdown that glowsDays left to your exam, and one tile per day that lights up brighter the more you studied.

Syllabus screen showing 27 percent covered and on track

Syllabus trackerEvery chapter, what's covered, and whether you're on pace to finish. One click for the full CBSE Class 12 syllabus.

Weekly Report with hours studied, days studied, revisions and percent remembered

Weekly reportThis week vs. last week, your best subject and the one that needs work. Arrives Sunday evening.

Rating pop-up with Again, Hard, Good and Easy and when each topic comes back

Five-minute morningsTick, rate, next. Fully keyboard-driven if you like: arrows, 1–4, X to skip, U to undo.

1day from idea to packaged app

2platforms, Mac and Windows

171automated tests (84 Mac + 87 Windows)

79CBSE Class 12 chapters built in

0accounts, ads or cloud

A few things I'm proud of

It's honest with you. If you forget a topic four times, it tells you revising isn't enough and you need to re-study it properly.
It learns you. After enough revisions it tunes its memory model to how your memory actually works.
It doesn't let you lie to yourself. You type how long you studied each day. Skip logging for too long and it locks until you do. (Zero is allowed.)
It has secrets. My lucky number is 7. Try clicking things 7 times.

Next up: a mock test tracker, so practice papers sit right next to your revision.

Want to try it?

Download it for Mac or Windows. Then message me on Instagram and tell me what you think.

@ishan.sgh

Download Re:Call Message me on Instagram

Thanks for reading. Now go revise.

Ishan Pratap Singh · maker of Re:Call