
30-Day Challenge: Build Habits
Daily circles on a calendar
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Free
About
Track 30-day challenges and everyday habits with one tap a day.
WHAT IT DOES
• 30-day challenges: Keep going for 30 days in a row. See your current streak and how many days are left. When you reach the goal, extend it by another 30 days or finish.
• Habits: Choose "N times a week" or "once every N days". A weekly habit counts on any day, and its progress shows the last 7 days, so it does not reset to zero when a new week starts. An every-N-days habit counts as kept if you did it within N days of the last time. For every-N-days habits, you can choose per habit whether a missed due day skips that turn or pushes the schedule back.
• A calendar of overlapping circles: Filled circles mark the days you did it, gray rings the days you didn't, and colored rings the days still ahead. Several challenges overlap in their own colors, so you can see how you're doing at a glance. The month view is the standard iOS calendar.
• One tap to log: Tap the circle on the Today screen. You can fix past days too.
• Reminders: Set a time for each challenge. If you hide notification previews on the Lock Screen, the challenge name stays hidden.
• Photos and files: Attach photos or files to a day of a 30-day challenge, using the standard photo picker and the Files app.
• Finishing never erases anything: Finished challenges move to the Archive, and their records stay on the calendar. You can resume them anytime.
• iPhone, iPad and iCloud: Use it on iPhone and iPad, in English or Japanese. Your records sync across your devices through iCloud.
• Calendar events (optional): Add a challenge's schedule to the iOS Calendar. You choose the permission level, and the app works without it. Only with full access does the app read the times (not the titles) of your other events, on your device, to suggest free time. They are never sent anywhere.
PRIVACY
No ads, no analytics, and nothing is sent to the developer's servers. Your records are stored on your device and in your own iCloud. The developer cannot see them.
NOTES
• Attached photos and files use your iCloud storage.
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What's New in 30
1.3
October 21, 2026
• Weekly habits now show progress for the last 7 days (including today) instead of the calendar week, so the count no longer resets to zero when a new week starts. Siri's replies and "what is left today" use the same count. • Weekly habits now show planned circles (colored rings) on the calendar: every day for 7 times a week, Monday, Wednesday and Friday for 3 times a week.
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