Comparison

75 Days Challenge vs Arc

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

75 Days Challenge

This app helps you build lasting habits by tracking your progress on custom challenges. Set flexible durations, log daily progress with photos and notes, and monitor weight trends. Stay motivated with home screen widgets to maintain your streaks.

Highlights
  • Custom challenges
  • Flexible durations
  • Home Screen widgets
  • Photo progress & compare
  • Notes on every entry
  • Weight tracking & summaries
Features
Read full description

Your challenge. Your rules. Set a goal, pick the duration, add your tasks — and show up every day. Run a 15-day sprint, a 30-day reset, a 75-day grind, a 90-day marathon — or anything from 1 to 365 days. Better keeps you accountable and makes progress visible. Build your challenge Create any habit challenge with custom tasks. Choose binary tasks (done/not done) or incremental ones (track reps, glasses, pages). Set reminders so nothing slips. See your transformation Snap daily progress photos and compare them side by side. Log weight and body measurements to watch trends over weeks and months. Write journal entries — even add voice notes — to stay mindful. Stay connected to your health Sync with Apple Health to auto-track steps, calories, water, sleep, exercise minutes, and more — 14 health metrics that update your tasks automatically. Get coached by AI Stuck in a rut? Ask your AI coach for advice on habits, motivation, or your weekly progress. It knows your data and gives personalized nudges. Join the community Share updates, follow friends, cheer each other on with likes and comments. Seeing others show up makes you want to show up too. Celebrate every win Unlock achievements across 9 categories, watch your streak grow on the activity heatmap, and share custom progress cards. Lives on your Home Screen Home screen and lock screen widgets let you check off tasks without even opening the app. One tap. Done. On your wrist Better on Apple Watch shows today's tasks: tick them off, count with the Digital Crown, and see your Apple Health tasks update live. Included with Pro. Available in 35+ languages. Subscription Better offers a 7-day free trial so you can explore everything the app has to offer. After the trial, payment will be charged to your Apple ID account. The subscription automatically renews unless it is canceled at least 24 hours before the end of the current period. You can manage and cancel your subscription in your Apple ID account settings. Ready to start? Make today Day 1. Terms of Service: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.joinbetter.app/privacy-policy Contact us: alexander.feedback@icloud.com

About

Arc

Track daily routines and build habits with customizable challenges. Integrates with Apple Health for automatic task completion. Offers a free starter challenge and optional Pro features for advanced tracking.

Highlights
  • Customizable challenge lengths (21-90 days)
  • Apple Health auto-tracking integration
  • Strict mode for missed days
  • Finisher card with completion details
  • Home and lock screen widgets
  • No account required for privacy
Features
Read full description

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/

Screenshots

75 Days Challenge4 screens
Arc4 screens

Verdict

The call

The clearest difference is review sentiment: Arc at 100% against 75 Days Challenge's 57%. Arc also leads on ads (none vs shown). On price, update cadence, in-app purchases and monetization model 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. 75 Days Challenge sells 10 in-app purchases, starting at $1.99 per 7 days and Arc sells 3 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

75 Days Challenge ships an update fortnightly, Arc every 9 days. The most recent releases landed on November 8, 2026 and October 31, 2026 respectively.

Scorecard2 real differences · 8 level
75 Days Challenge versus Arc: the parameters behind the verdict, then further details
Parameter75 Days ChallengeArc
PriceFreeFree
Rating4.8 (695 ratings) — better—
Positive reviews57.4% of reviews100.0% of reviews — better
Number of ratings695 — better—
Update frequencyFortnightlyEvery 9 days — better
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchasesFreemium
DevicesiPhone, iPad, Apple Watch — betteriPhone, Apple Watch
Requires iOS18.017.0 — better
Further details — not scored
Size96 MB18 MB
Age rating4+4+
DeveloperAlexander Parnev岚烜 吴

Customer experience

75 Days Challenge

All ratings693 ratings
Positive94.4%
Neutral2.7%
Negative2.9%
Written reviews68 reviews
Positive57.4%
Neutral7.4%
Negative35.3%

Arc

Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

75 Days Challenge

Reported bugs

4 issues
  • Settings page freezes app
  • Checklist widget doesn't update automatically
  • App gets stuck on day 6 and won't unlock
  • Camera function is unreliable

Requested features

4 requests
  • Add ability to start over at day 1 instead of resetting whole challenge
  • Integrate with friends/social features
  • Expand tracking capabilities beyond just weight and photos
  • Add more customization options

Arc

Not enough reviews yet to summarise bugs or requests.

In-app purchases

10 purchases

75 Days Challenge

Subscriptions8
  • Full Access (Weekly)3 Days trial$1.997 Days
  • Full Access$2.991 Month
  • Full Access (Monthly)$3.991 Month
Show 5 more
  • Full Access$5.991 Month
  • Full Access (Monthly)$9.991 Month
  • Full Access (Annual)7 Days trial$19.991 Year
  • Full Access (Annual)7 Days trial$29.991 Year
  • Full Access (Annual)7 Days trial$49.991 Year
One-time2
  • Lifetime Premium$19.99
  • Lifetime Pro$59.99
3 purchases

Arc

Subscriptions2
  • Arc Pro Monthly$2.991 Month
  • Arc Pro Yearly$19.991 Year
One-time1
  • Arc Pro$29.99

Questions

Is 75 Days Challenge free?
75 Days Challenge is free to download, with in-app purchases available.
Is Arc free?
Arc is free to download, with in-app purchases available.
Do 75 Days Challenge or Arc have ads?
75 Days Challenge shows ads; Arc does not.
Which is updated more often, 75 Days Challenge or Arc?
75 Days Challenge ships an update fortnightly, and Arc every 9 days. Most recently, 75 Days Challenge was updated on November 8, 2026 and Arc on October 31, 2026.

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