
66 Challenge
Build habits in 66 days
0 ratings
Free
In-App Purchases
About
Transform your life one habit at a time with 66 Challenge - the science-backed app that helps you build lasting habits in just 66 days.
WHY 66 DAYS?
Research shows it takes an average of 66 days to form a new habit. We've built the perfect system to guide you through every single day.
KEY FEATURES:
- Daily Habit Tracking - Mark your habits complete each day and watch your streak grow
- Progress Visualization - See your 66-day journey unfold with beautiful progress tracking
- Streak Protection - Stay motivated with streak counts and milestone celebrations
- Progress Photos - Capture your transformation with optional daily photos
- Friends & Social Feed - Follow friends, celebrate their wins, and stay accountable together
- Squads - Join or create groups to challenge habits together
- Achievements - Unlock badges as you hit milestones on your journey
- Reminders - Never miss a day with customizable notifications
BECOME UNDENIABLE
Whether you want to exercise daily, read more, meditate, or build any positive habit - 66 Challenge gives you the structure, motivation, and community to make it stick.
Start your 66-day transformation today.
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What's New in 66 Challenge
1.0.8
February 17, 2026
New updated screenshot previews of the app.
Subscription plans
Pro Annual
Unlock all features for 1 year
$29.991 Year
7 Days trial1
In-App Purchases
$59.99
Pro Lifetime
Unlock all features forever



