66 Challenge
Build habits in 66 days
About
Build lasting habits with a science-backed system designed to guide you through a 66-day journey. Track daily progress, visualize your transformation, and stay motivated with social features and achievements. Transform your life one habit at a time.
What's New in 66 Challenge
1.1.1
August 25, 2026
Fixed a bug where the day could advance twice in one evening. Reminders now stay on after reinstalling. New share card. Badges now reward your longest streak.
MoreSubscription plans
Pro Annual
Unlock all features for 1 year
In-App Purchases
$59.99
Pro Lifetime
Unlock all features forever
FAQ
What is the 66 Challenge app?
66 Challenge is a productivity app designed to help users build lasting habits over a 66-day period. It offers daily tracking, progress visualization, and community features to support users in their habit-forming journey.
How does 66 Challenge help users build habits?
The app utilizes a science-backed approach, suggesting 66 days as the average time to form a new habit. It provides daily tracking, streak protection, milestone celebrations, and optional progress photos to keep users motivated.
Can I track habits with friends on 66 Challenge?
Yes, 66 Challenge features a social feed where you can follow friends, celebrate their achievements, and stay accountable together. You can also join or create 'Squads' to challenge habits as a group.
What are the subscription options for 66 Challenge?
66 Challenge offers 'Pro Monthly' for $3.99/month and 'Pro Annual' for $29.99/year. Both plans include a 7-day free trial.
Is 66 Challenge available on multiple devices?
Based on the supported devices, 66 Challenge is available on iPhone, iPad, and iPod, indicating compatibility with Apple's iOS ecosystem.
How often is 66 Challenge updated?
The app was last updated on August 18, 2026, with version 1.1.0. This suggests a relatively recent update, indicating ongoing development and support.
What is the age rating for 66 Challenge?
66 Challenge has an age rating of 12+, making it suitable for users aged 12 and above.
Does 66 Challenge have ads?
No, 66 Challenge does not contain advertisements. The app is free to download and offers optional in-app purchases for premium features.
