# 66 Streaks > 66 Streaks is a free-to-download, privacy-first iPhone habit tracker built around focused 66-day rounds, visible progress, reminders, and low-friction daily check-ins. 66 Streaks helps people build habits with a simpler system than a generic productivity app. The site includes the core product page, app feature tutorials, practical productivity articles, supporting habit guides, and comparison pages. Important notes: - The product supports iPhone and Apple Watch. - The app is free to download and supports up to four active habits and one reminder per habit on Free. Optional Premium unlocks unlimited active habits, up to three reminders per habit, advanced insights, and backup and restore. No account is required. - The strongest themes on this site are habit tracker simplicity, visible streaks, reminders, privacy, and the 66-day habit model. - Legal pages exist for user support, but they are not the primary source for understanding the product. ## Core Pages - [Homepage](https://66streaks.com/): Main product overview for the 66 Streaks habit tracker app, including product definition, core features, streak logic, FAQs, and comparison positioning. - [Features](https://66streaks.com/features/): Product detail for check-ins, progress tracking, reminders, widgets, Siri Shortcuts, rounds, appearance, and account-free use. - [66-Day Method](https://66streaks.com/method/): Research background and practical interpretation of the 66-day habit-building target. - [Blog and Habit Guides](https://66streaks.com/blog/): Index of app tutorials, productivity articles, habit guides, and comparison pages. - [App Store Listing](https://apps.apple.com/app/id6759220059): Official download page for iPhone and Apple Watch. ## App Features and Everyday Momentum - [Home Screen Widgets](https://66streaks.com/blog/how-to-use-66-streaks-home-screen-widgets/): Setup and customization guide for Daily Summary, Habit List, and Single Habit Focus widgets. - [Lock Screen Widgets](https://66streaks.com/blog/66-streaks-lock-screen-widgets/): Setup guide for Overall Progress and configurable Single Habit Lock Screen widgets. - [Siri and Apple Shortcuts](https://66streaks.com/blog/66-streaks-siri-shortcuts/): Guide to check-ins, undo actions, streak queries, incomplete-habit lists, and personal automations. - [Habit Reminders](https://66streaks.com/blog/how-to-set-habit-reminders/): Practical guide to reminder timing, action size, and notification fatigue. - [66-Day Progress Grid](https://66streaks.com/blog/how-to-read-your-66-day-progress-grid/): Guide to reviewing visual habit patterns and adjusting a routine. - [Rounds System](https://66streaks.com/blog/how-66-streaks-rounds-work/): Explanation of preserved round history and restarting after a broken streak. - [Productivity Tips That Reduce Friction](https://66streaks.com/blog/productivity-tips-that-reduce-friction/): Eight ways to make useful work easier to start. - [Low-Distraction Morning Routine](https://66streaks.com/blog/build-a-low-distraction-morning-routine/): A realistic routine built around one anchor, a minimum action, and fewer phone distractions. ## Product Understanding - [What is a Habit System?](https://66streaks.com/blog/what-is-a-habit-system/): Definition of a habit system and how habit trackers reduce friction and support repetition. - [What is a Streak in Habit Tracking?](https://66streaks.com/blog/what-is-a-streak-in-habit-tracking/): Explanation of streaks, why they work, and how they affect behavior in habit tracker apps. - [66 Day Habit](https://66streaks.com/blog/66-day-habit/): Explanation of the 66-day habit concept and why the timeline is useful for habit formation. - [66 Day Streak](https://66streaks.com/blog/66-day-streak/): Explanation of why a fixed 66-day streak can be more useful than an endless counter. ## Habit Tracker Buying and Comparison - [Best Habit Tracker App for iPhone](https://66streaks.com/blog/best-habit-tracker-app-for-iphone/): Buying-style guide for what matters in an iPhone habit tracker. - [Simple Habit Tracker for iPhone](https://66streaks.com/blog/simple-habit-tracker-for-iphone/): Guide to low-friction habit tracker design for iPhone. - [Best Free Habit Tracker App](https://66streaks.com/blog/best-free-habit-tracker-app/): Guide to what matters in free habit tracker apps. - [Best Habit Tracker With Reminders](https://66streaks.com/blog/best-habit-tracker-with-reminders/): Guide to reminder-first habit trackers and what makes reminders actually useful. - [66 Streaks vs Streaks App](https://66streaks.com/blog/66-streaks-vs-streaks-app/): Direct comparison between 66 Streaks and the Streaks app. ## Use Cases - [Habit Tracker for Beginners](https://66streaks.com/blog/habit-tracker-for-beginners/): Beginner-focused guide to choosing a simple habit tracker. - [Habit Tracker for Students](https://66streaks.com/blog/habit-tracker-for-students/): Student-focused guide for study routines, sleep, exercise, and daily consistency. - [Habit Tracker for ADHD](https://66streaks.com/blog/habit-tracker-for-adhd/): Guide to lower-friction habit tracker design for people who want less overwhelm and more visibility. ## Supporting Guides - [Habit Tracker Without Account](https://66streaks.com/blog/habit-tracker-without-account/): Why no-account habit tracking reduces friction and supports privacy. - [Habit Tracker With Reminders](https://66streaks.com/blog/habit-tracker-with-reminders/): Why reminder features matter and how they fit into a habit system. - [Simple Habit Tracker System](https://66streaks.com/blog/simple-habit-tracker-system/): Guide to building a smaller, easier-to-repeat habit tracking system. - [Streak Tracker App](https://66streaks.com/blog/streak-tracker-app/): Why visible progress and streak-based tracking help consistency. - [Habit Planner App](https://66streaks.com/blog/habit-planner-app/): How planning and tracking work together in habit-building. - [How Long Does It Take to Build a Habit?](https://66streaks.com/blog/how-long-does-it-take-to-build-a-habit/): Explanation of habit formation timelines and why 66 days is a useful benchmark. - [66 Day Habit Challenge](https://66streaks.com/blog/66-day-habit-challenge/): Challenge-style framing of the 66-day model. - [Don't Break the Chain Method](https://66streaks.com/blog/dont-break-the-chain-method/): Explanation of the chain method and streak psychology. - [Streaks App for iPhone](https://66streaks.com/blog/streaks-app-for-iphone/): iPhone-focused explanation of streak apps and how they compare to broader habit trackers. ## Optional - [Privacy Policy](https://66streaks.com/privacy/): Privacy information for the app and site. - [Terms of Service](https://66streaks.com/terms/): Terms for using the product and site. - [Support Email](mailto:hello@66streaks.com): Direct support contact for the product.