“”
Mohini
You've started before.This time you'll finish.
21 days. One tap a day. A finish line you can actually see — and 12,000 people who already crossed it.
12,000+downloads
30+countries
4.5on Google Play
On a laptop? Scan to install.
Opens the App Store or Google Play on your phone.
Good morning,
Meera
Day 9 of 21
Read 20 pages
Today
Read 20 pages
Day 9 of 21
Focus session
47m today
Walk 30 min
Day 2 of 21
Everything below, in seven lines.
Jump anywhereYou downloaded an app.
You lasted four days.
You felt worse than before you started.
January4 days
March6 days
July2 days
The app wasn't the problem.
The finish line was missing.
Nothing you downloaded ever ended. No last day, no result, nothing to cross. Just a counter that went up until the morning you forgot — and then a number that reminded you, every day after, that you quit. Twenty-one days has a last day.
21days, then it's done
66 days isn't a plan. It's a sentence.
The honest version: research on habit formation puts the average closer to 66 days, and some habits take far longer. That's true. It's also useless to you on day one, because nobody can picture day 66.
21 days is close enough to see from where you're standing. You can count it on your fingers. You can name the date it ends. And finishing one makes the next one easier — most people stack a second challenge before the first is even over.
21 daysYou can picture the last day
66 daysThe research average
ForeverWhat every other habit tracker offers you
Finish a 21, start another. Three cycles is 63 days — you just never had to stare at the number.
One tap. That's the whole method.
No logging what you ate, no rating your willpower out of ten, no streak maths to carry around in your head. You did the thing, you tap once, you close the app. Ten seconds — which is exactly why it still happens on the days everything else falls apart.
Go on, tap itRead 20 pages
Day 9 of 21
Tap the circle to check in.
Focus Mode
Something always interrupts.For the next hour, nothing will.
One tap and the phone stops asking for your attention. Notifications go silent, a timer starts, and every minute of it lands in your stats automatically. Calls still get through. Nothing else does.
Whatever you're working on — a canvas, a syllabus, a client project, a business, a quiet hour of your own — at the end of the week you don't have a feeling about how it went. You have a number.
Family group12 new messages
Social3 new posts for you
▶VideoA channel you watch posted
5 mentionsand 12 others
Ready to focus
00:00
Four apps want you right now.
47mtoday
4.2hthis week
9day streak
Go on, start a session
40h 12m
of focused time this month, counted automatically — not estimated, not remembered.
9-day focus streak
Notifications silenced
Only calls get through. Everything else waits until you're done.
Counted automatically
No stopwatch to remember, no log to fill in. Start it and forget it.
A streak worth keeping
Focus once a day and it grows. The record is the motivation.
Miss a day? You're not starting over.
One missed day is a missed day. It isn't a verdict on you, and it doesn't wipe the eleven you already did. The challenge keeps its dates, your history keeps the gap, and tomorrow is just day thirteen.
Every app that resets you to zero is teaching you that the only acceptable run is a perfect one. That's how people quit in week two.
Walk 30 minDay 12 of 21 · 11 done
Day 6 was missed. Day 7 picked up where you left off. The finish line didn't move.
No guilt mechanics
No red marks, no shaming notification, no counter reminding you that you slipped.
Reminders that move with you
Check in at 7am for a week and the nudge quietly shifts to 7am. You never have to go and change it.
We check your alarms actually fire
Some Android phones kill reminders to save battery. If yours is one, the app tells you how to fix it instead of letting you think you forgot.
The part you'll go back and reread.
Every check-in can carry a note and a mood. It takes ten seconds and you'll ignore it for the first week — then one evening you'll scroll back to day one and read what you were like before any of this.
Alongside it: completion, patterns, every challenge you've ever run. Not to grade you. So you can see which habits stuck and which ones you were never actually going to keep.
Journal
Day 12 · Walk 30 min
Nearly skipped it. Went out at 9pm in the end and did a slow loop of the colony. Twenty-four minutes, not thirty. Counting it.
Day 11 · Walk 30 min
Rain all day. Did stairs in the building instead. Felt stupid, did it anyway.
Day 10 · Walk 30 min
First time it felt like something I do, rather than something I'm making myself do.
This month
Lightermore done
All time
4challenges finished
63days checked in
12day best streak
Twenty-one out of twenty-one.That's a Perfect 21.
Every day checked in. Not one missed.
Not nineteen. Not “mostly”. It is deliberately hard, because a badge you get for showing up half the time isn't worth putting your name to. Most people need two or three attempts before they land one.
And when you do, you don't just get a badge. You get a line on a wall that anyone can see.
6
people have finished a Perfect 21.
From 30+ countries, in 13 languages, one habit at a time. The wall grows every day, whether anyone is watching or not.
Mohini
Mohsin
Test A.
“”
Test A.
“”
Mohsin
There's a space on this wall with your name on it.
Joining is opt-in and takes one tap after you finish. Your display name and country show. Nothing else, ever.
Free is not a trial.
One challenge at a time, for as long as you like, without paying anything. Pro exists for people who want to run several at once and keep every note they've ever written. That's the whole difference.
Starter
Free, forever
₹0
No card, no expiry
- One active challenge at a time
- Journal, one entry a day
- Stats for your current challenge
- Reminders and alarms
- Shows ads
- Several challenges at once
- Full history
Pro
For habit stackers
₹499/year
About ₹42 a month
- Unlimited active challenges
- Journal, ten entries a day
- Full stats and all history
- Reminders and alarms
- No ads
- Home screen widgets soon
- Personalised nudges
Ultra Pro
Everything, supercharged
₹999/year
About ₹83 a month
- Everything in Pro
- Journal, a hundred entries a day
- Advanced stats and insights
- Reminders and alarms
- No ads
- Home screen widgets soon
- Personalised nudges soon
Everyone starts with 30 days of Pro, free. No card to enter, nothing to cancel. When it ends you drop to Starter unless you choose otherwise.
Prices shown in rupees. The App Store and Google Play charge in your own currency, so what you see at checkout is the local equivalent.
No auto-upgrade, no price that quietly doubles in year two, and cancelling takes one tap in your store settings — not an email to us.
If this app helps you build one good habit and leave one bad one behind, then it has done its job. That's the only score I'm keeping.
Amol HirkaneFounder, 21 Days Challenge
Day 1 is today.
Pick one thing. Tap once a day. Three weeks from now you'll know whether you're the kind of person who finishes — and you'll have the answer in writing.
On a laptop? Scan to install.
Opens the App Store or Google Play on your phone.