Pick a few rules and stick to them every day for 90 days. Do it on your own or bring a couple of friends.
$9 for the whole arc. You pay once and it never renews.
Pick a few rules, like wake up before 6 or train 4 times a week. The app turns them into a short letter from you to you, with your start and summit dates, and you sign it with your finger. It stays on your phone and nobody else reads it.
Warm-up lets one rule slip each day and Standard gives you one free miss a week. On Hard any miss resets your streak, and Monk mode sends you back to day 1. Every weight includes 3 sick days, and you can switch until the end of day 3.
Each rule can remind you at its own time. By default a day ends at 3:00 am, not midnight, so a late session still counts for today.
The wake-up reminder goes off. Rules with a deadline count down on the row, so you can see how long is left.
Up at 5:50 but forgot to tap? A deadline is about when you did it, so there’s an hour after it to check it off.
Day 14, done. Anything you forget to check comes back the next morning, and you have until noon to answer.
A crew is up to 8 people. Everyone keeps their own rules and dates, and the crew sees how many each person hit today, never what the rules are. A cheer is one tap, and a nudge only goes to someone who hasn’t checked in yet, never before noon their time.
Crew chat is text only, with no photos, links or private messages, and messages are deleted after 30 days. You can report or block anyone from their name, and a real person reviews every report within 24 hours.
The arc is drawn as a climb, with Camp 1 on day 30, Camp 2 on day 60 and the summit on day 90. Progress keeps every day on one calendar, bad days included, and a sick day never shows up as a miss.
The summit screen shows once, with your check-ins, your best streak and anyone from your crew who made it too.
Rules, check-ins and your contract live on your phone and in your own iCloud or Google backup. We never receive them.
You don’t need an account to do an arc on your own. Crews need a quick sign-in with Apple or Google. With Sign in with Apple you can choose Hide My Email, and we never see your real address.
There are no ads in 90North, and we don’t run analytics on your check-ins or rule names.
No trial, and nothing renews, so there’s no surprise charge in January.
When the arc ends you can buy the next one with the same rules, start over with new ones, or take a break. The App Store and Google Play show the price in your currency.
Winter arc 2026
October 1 to December 29
90-day arc$9.00
Crew of up to 8 peopleIncluded
Unlimited rules and check-insIncluded
Cheers and remindersIncluded
Day 90 recap cardIncluded
RenewsNever
Total$9.00
about 10¢ a day.
Anything else, write to support@90north.app. We answer within a day.
It depends on the difficulty you picked. Warm-up lets one rule slip each day and Standard gives you one free miss a week. On Hard a miss resets your streak but the arc keeps going. Monk mode sends you back to day 1.
Every arc comes with 3 sick days. A sick day isn’t a miss, your streak holds and your summit date doesn’t move. Your crew just sees “Resting today.”
Yes, through the end of day 3. After that they’re locked for the arc; reminder times can always change.
Yes. Your 90 days start the day after you pay, and you can still join a friend’s crew. Everyone in a crew keeps their own dates.
Not if you’re doing it alone. Crews need a quick sign-in with Apple on iPhone or Google on Android.
No. You pay $9 once for the whole arc and it never renews. Keep going after day 90 is a new purchase, and nothing is charged without the store’s payment sheet.
Yes, on phones with Android 8 or later, and on iPhone with iOS 17 or later. Moving an account between iPhone and Android isn’t supported yet, and a purchase stays with the store you bought it from.
Yes. Check-ins save on your phone, and cheers, nudges and messages go out when you’re back online.
Install 90North on it, signed in to the same Apple or Google account, and tap “Already started? Restore your arc.” Your purchase and arc come back from your iCloud or Google backup.
Refunds go through Apple or Google, the same way as any app purchase.
Arcs start October 1. Pay before then and you start with everyone else.
On a computer? Scan this with your phone.