# Arc: 75 Day Challenge Tracker — Habit streak, daily routine > Habit streak, daily routine (iPhone/iPad app by 岚烜 吴.) - Source: https://appshunter.io/ios/app/arc-75-day-challenge-tracker/id6796747380 (this page in markdown: same URL + `.md`) - Developer: [岚烜 吴](https://appshunter.io/developer/6788589687) - Category: Health & Fitness, Productivity - Price: Free with in-app purchases - Age rating: 4+ - Requires: iOS 17.0 · 8 MB - Languages: American English, Arabic, Catalan, Croatian, Czech, Danish, Dutch, Finnish, French (France), German (Germany) and 24 more - Released: 2026-08-21 - Data updated: 2026-09-05 - User reviews in markdown: https://appshunter.io/ios/app/arc-75-day-challenge-tracker/id6796747380/reviews.md ## What is Arc? Most challenge apps want a subscription before you've finished week one. Arc doesn't. The 75 Day Classic is free. All seventy-five days of it, not a trial, and it stays that way. Same for the 30 Day Reset. Pick a challenge, tick your tasks, watch a row of empty boxes fill in one a day. That's the app. No feed, no friends list, no leaderboard, and nothing in here calls you champ. FIVE WAYS TO START 30 Day Reset. Three habits you choose yourself. Free. 66 Day Habit Builder. Three to five habits, and sixty-six days because that's the number the research keeps landing on. 75 Day Classic. Two workouts, a diet, water, reading, a daily photo. Free. 75 Day Gentle. Same seventy-five days with one workout and a bit of air. Custom. Your rules, 21 to 90 days. APPLE HEALTH DOES THE BORING PART Switch on auto-tracking for a task and Arc reads your steps, exercise minutes and outdoor workouts, then ticks it off without being asked. It only ever reads. Nothing gets written back to Health, and none of it leaves your phone. Don't want to grant that? Those tasks stay manual and the rest of the app doesn't care. SEASONS Shared start dates run through the year: Fall Lock-In, Winter Arc, New Year Arc, Spring Reset, Summer Arc. Begin on one and its stamp goes on your finisher card. Starting tomorrow instead is also a perfectly good plan. STRICT MODE, OFF BY DEFAULT Turn it on and a missed day sends you back to Day 1. You get one grace day for the whole run, and once it's gone it's gone. The card at the end looks the same either way. THE FINISHER CARD Reach the end and Arc prints you a card: day count, completion rate, longest streak, and the sentence you wrote on day one about why you started. Square, story, or wide. Save it to Photos or send it straight out. Widgets put the day count and what's left on your home screen and lock screen. The medium one lets you tick things off without opening the app. WHAT ARC WON'T DO One purchase, and no subscription ever. No account, so there's no email and no password to lose. No servers of mine either: your data sits on your phone and in your own iCloud, and I can't see any of it. No ads, no analytics. And no photo verification, because the progress photo goes to your camera roll and Arc never opens it. FREE, PERMANENTLY The 75 Day Classic and the 30 Day Reset, both in full. One custom challenge. The small widget. Your finished history. Apple Health auto-tracking. ARC PRO, ONE PURCHASE The 75 Day Gentle and the 66 Day Habit Builder, unlimited custom challenges, several running at once, all the widget sizes including the interactive one, and the finisher card in all three shapes. Arc syncs through your own iCloud, so a new phone picks up where the old one stopped. Turn iCloud off and everything still works on the device. Privacy: https://arc.wuyuxai.com/privacy ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Arc Pro | $6.99 | one-time | ## Version history (last 2 releases) ### 1.1 — 2026-09-01 The 75 Day Classic is now free. All seventy-five days of it, same as the 30 Day Reset. Fixes: Restarting one challenge could wipe today's ticks on another one. The Merit link in Settings went nowhere. Ticking your last task from the widget didn't stop the evening reminder. ### 1.0 — 2026-08-21 No release notes. ## More apps by 岚烜 吴 - [CoverForge: Book Cover Maker](https://appshunter.io/ios/app/coverforge-book-cover-maker/id6790119719) - [OffLingo: Offline Translator](https://appshunter.io/ios/app/offlingo-offline-translator/id6790425607) - [Pip: Kids Preschool Storybook](https://appshunter.io/ios/app/pip-kids-preschool-storybook/id6792321907) - [Passport Photo & ID: IDReady](https://appshunter.io/ios/app/passport-photo-and-id-idready/id6794147039) - [Meowtch: Cat Cafe Tile Match](https://appshunter.io/ios/app/meowtch-cat-cafe-tile-match/id6794862151) - [Story Pole: Feet Inch Stairs](https://appshunter.io/ios/app/story-pole-feet-inch-stairs/id6795585219) All apps by 岚烜 吴: https://appshunter.io/developer/6788589687 --- *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 2026-09-05.*