# 75 Days Challenge vs Arc

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.

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.

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.

## The numbers

| Metric | 75 Days Challenge | Arc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (695 ratings)](https://appshunter.io/ios/app/75-days-challenge-better/id6667095733/reviews)** | — |
| Number of ratings | **695** | — |
| Positive reviews | 57.4% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Fortnightly | **Every 9 days** |
| Monetization | Free with in-app purchases | Freemium |
| Size | 96 MB | 18 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Alexander Parnev](https://appshunter.io/developer/1645934480) | [岚烜 吴](https://appshunter.io/developer/6788589687) |

## What reviewers say

### 75 Days Challenge

[App page](https://appshunter.io/ios/app/75-days-challenge-better/id6667095733)

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:** macOS Compatibility, Apple Watch app, Vision Pro support, iPhone Duo support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Access (Weekly) | $1.99 | per 7 days |
| Full Access | $2.99 | per month |
| Full Access (Monthly) | $3.99 | per month |
| Full Access | $5.99 | per month |
| Full Access (Monthly) | $9.99 | per month |
| Full Access (Annual) | $19.99 | per year |
| Full Access (Annual) | $29.99 | per year |
| Full Access (Annual) | $49.99 | per year |
| Lifetime Premium | $19.99 | one-time |
| Lifetime Pro | $59.99 | one-time |

**What reviewers like**

- 👍 Easy to use
- 💡 Customizable challenges
- 🚀 Straightforward layout
- 🔒 Lifetime premium access

**What reviewers complain about**

- 🐛 Glitchy and buggy
- 🚫 Limited features for paid version
- 💰 Not truly free, requires payment
- 🤔 Lack of advanced tracking features

**Reported bugs**

- 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**

- 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

[App page](https://appshunter.io/ios/app/arc-75-day-challenge-tracker/id6796747380)

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:** macOS Compatibility, Family Sharing, Apple Watch app, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Arc Pro Monthly | $2.99 | per month |
| Arc Pro Yearly | $19.99 | per year |
| Arc Pro | $29.99 | one-time |


## Frequently asked 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.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*