# 30-Day Challenge: Build Habits — Daily circles on a calendar

> Daily circles on a calendar (iPhone/iPad app by junto yanai.)

- Source: https://appshunter.io/ios/app/30-day-challenge-build-habits/id6821519396 (this page in markdown: same URL + `.md`)
- Developer: [junto yanai](https://appshunter.io/developer/6817621328)
- Category: Lifestyle, Productivity
- Price: Free
- Age rating: 4+
- Requires: iOS 27.0 · 7 MB
- Languages: American English, Japanese
- Released: 2026-10-12
- Data updated: 2026-10-24

## What is 30?

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.

## Is 30 safe?

Not enough ratings yet to assess 30.

## Is 30 legit?

30-Day Challenge: Build Habits appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for 30 is 65 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 4 releases)

### 1.3 — 2026-10-21

• 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.

### 1.2 — 2026-10-20

• Siri and Shortcuts: say something like "Log English in 30-Day Challenge" to record today. You can also ask what is left today and how a challenge is going.
• Search your challenges in Spotlight by name or by describing them. Tap a result to open it.
• Settings now opens this app's language setting in the Settings app, so you can use the app in a different language from your device (Japanese or English).

### 1.1 — 2026-10-19

• A redesigned iPad experience: Today and Archive now use the full width, and a challenge's details appear in two columns on wide screens.
• For "once every N days" habits, you can now choose what happens when you miss a due day: skip that turn, or push the schedule back.
• Tapping a reminder now opens that challenge's details.
• Improved how scheduled days are drawn on the calendar.

### 1.0 — 2026-10-13

No release notes.

## More apps by junto yanai

- [Budget Book - Track Spending](https://appshunter.io/ios/app/budget-book-track-spending/id6817621326)
- [Interval Routine Timer](https://appshunter.io/ios/app/interval-routine-timer/id6817631557)
- [Homework Chime - Due Dates](https://appshunter.io/ios/app/homework-chime-due-dates/id6821639711)

All apps by junto yanai: https://appshunter.io/developer/6817621328

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-24.*