Arc vs Winter Arc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Arc
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Most challenge apps ask you to pay before you've finished week one. Arc doesn't. The 30 Day Reset isn't a trial version. It's the whole thing, all thirty days, free, and it stays free. 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. 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, outdoor workouts, water and mindful minutes, 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 No account, so there is no email and no password to lose. Your data sits on your phone and in your own iCloud, and I can't see any of it. No ads. Progress photos stay in Arc on your phone. Nobody checks them, nobody looks at them. FREE, PERMANENTLY The 30 Day Reset in full. One custom challenge. The small widget. Your finished history. Apple Health auto-tracking. ARC PRO Every template, unlimited custom challenges, several running at once, all the widget sizes including the interactive one, and the finisher card in all three shapes. Pay by the month or the year, or buy it once and it's yours. 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 Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Winter Arc
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"I want to get fit" can wait until Monday. Then next Monday. Then January. A winter arc can't. It has a finish line. Pick 30, 60 or 90 days. Decide who you're becoming. Then get on with it. WHAT IT ACTUALLY DOES Winter Arc takes the four laws of behaviour change from James Clear's Atomic Habits and turns them into things you do, rather than things you read about. Make it obvious. Decide when and where each habit happens, and stack it onto something you already do. "After I pour my coffee, I will..." No relying on remembering. Make it attractive. Pair the thing you should do with something you want to do. Podcast and a walk. Coffee and ten pages. Make it easy. Every habit gets a two-minute version for the bad days. "Read ten pages" becomes "open the book". Something beats nothing. Make it satisfying. Tick it off, watch the chain grow, see the ring move toward your finish line. Your brain likes proof. This gives it some. THE BIT THAT MATTERS Day one to ten is easy. Then it's day seventeen, it's raining, you slept badly, and you can't be bothered. That's the part that decides it. So Winter Arc doesn't punish you for missing. Miss one day and nothing happens. Miss two in a row and it says something, because two is where a habit quietly becomes a former habit. Rest days are built in. You're aiming to get back to it, not to be perfect. IN THE APP A countdown ring: day 37 of 90, always in view Don't-break-the-chain calendar for every habit Streaks, with a never-miss-twice nudge when you slip The 1 percent compounding chart, with your position marked on it A weekly review: what worked, what didn't, one thing to change Streak freezes for planned rest days Reminders at your habit time, plus one evening check An identity statement on your home screen, in case you forget who this is for NO ACCOUNT, NO FEED, NO ADS Everything lives on your phone. There's nothing to sign up for, no server holding your habits, and nobody watching your streak. Delete the app and the data goes with it. Free. All of it. Not affiliated with or endorsed by James Clear. The four laws of behaviour change are his work, from Atomic Habits (2018).
Screenshots
Verdict
The clearest difference is in-app purchases: Winter Arc at none against Arc's 1. Arc's advantage is update cadence (every 9 days vs every 3 weeks). On price, ads, device support and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Arc sells 1 one-off in-app purchase. Winter Arc asks for nothing beyond the download.
Arc ships an update every 9 days, Winter Arc every 3 weeks. The most recent releases landed on October 7, 2026 and October 24, 2026 respectively.
| Parameter | Arc | Winter Arc |
|---|---|---|
| Price | Free | Free |
| Rating | — | 3.5 (2 ratings) — better |
| Positive reviews | — | 50.0% of reviews |
| Number of ratings | — | 2 — better |
| Update frequency | Every 9 days — better | Every 3 weeks |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Devices | iPhone, Apple Watch — better | iPhone |
| Requires iOS | 17.0 | 16.4 — better |
| Further details — not scored | ||
| Size | 18 MB | 35 MB |
| Age rating | 4+ | 4+ |
| Developer | 岚烜 吴 | Max Whicher |
In-app purchases
Arc
- Arc Pro$6.99
Winter Arc
No in-app purchases









