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  • 21 Days: Habit Builder screenshot 1
  • 21 Days: Habit Builder screenshot 2
  • 21 Days: Habit Builder screenshot 3
  • 21 Days: Habit Builder screenshot 4

About 21 Days: Habit Builder

Build a new habit in 21 days, starting small enough that you'll actually do it. Big goals are easy to drop. 21 Days starts you with a tiny action, about 2 minutes a day, and gives you a reason to come back tomorrow: a streak you don't want to break and a tree that grows with every check-in. • Pick a habit and check in once a day • Watch your seedling grow into a tree as you keep going • Take a rest day when you need one, without losing your streak (2 per run) • Forgot yesterday? You can still check it in today • Medals on days 7, 14 and 21 • Clear stats: current and best streak, success rate, last 7 days • Share a card when you finish your 21 days • Morning and evening reminders at times you choose • Your data stays on your device. No account needed. • In English and Thai FREE Up to 2 habits in progress at a time (finished habits don't count). 21 DAYS PREMIUM Up to 10 habits in progress, a reminder time for each habit, and Home Screen widgets. Premium is an auto-renewing subscription, billed monthly or yearly. The price is shown in the app in your local currency before you buy. Payment is charged to your Apple ID at confirmation of purchase. The subscription renews automatically unless it is turned off at least 24 hours before the end of the current period. You can manage or cancel it in your App Store account settings. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://teezer.cloud/legal/21days/privacy/ Start today, and let's get to day 21 together.

What’s new

Version 1.3.0 · Updated October 4, 2026

21 Days now speaks English. It follows your phone's language, or pick one in Settings. • Clearer progress: "Day 5" and "3 of 21 done" on every card • Your streak no longer reads 0 in the morning before you check in • Forgot day 21? You can still check it in the next day • Reinstalling or switching phones keeps Premium without tapping Restore • Better VoiceOver support and Reduce Motion • Many smaller fixes

App privacy

The developer, Phaisan Thauaonsamut, reported these privacy practices to Apple.

Data Linked to You

The following data, which may be collected and linked to your identity, may be used for the following purposes:

  • Purchases: Purchase History
  • Identifiers: User ID

Used for: App Functionality

Alternatives to 21 Days: Habit Builder

Looking for apps like 21 Days: Habit Builder? Here are 6 similar apps on the App Store. The highest rated is 1% Better - Track Habits (5.0/5), and all 6 are free to download.

21 Days: Habit Builder vs. alternatives
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21 Days: Habit Builder – Free October 4, 2026
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1% Better: Habit Tracker 5.0 / 5 (1) Free May 15, 2026 Compare
1% Better: Daily Habit Tracker 5.0 / 5 (4) Free Jun 10, 2026 Compare

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