# Muscle vs Group Challenge Runner

The clearest difference is in-app purchases: Muscle at none against Group Challenge Runner's 3. Muscle also leads on iOS requirement (13.0 vs 15.6). Group Challenge Runner's advantage is update cadence (every 4 days vs fortnightly). On price, ads and device support there is nothing between them.

Both are free to download. Group Challenge Runner sells 3 in-app purchases, starting at $2.99 per month. Muscle asks for nothing beyond the download.

Muscle ships an update fortnightly, Group Challenge Runner every 4 days. The most recent releases landed on May 18, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | Muscle | Group Challenge Runner |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/group-challenge-runner/id6753975475/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Fortnightly | **Every 4 days** |
| Monetization | — | Free with in-app purchases |
| Size | 186 MB | 80 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [BullsAI B.V.](https://appshunter.io/developer/1731344307) | [Nesredin Ahmed](https://appshunter.io/developer/1808952655) |

## What reviewers say

### Muscle

[App page](https://appshunter.io/ios/app/muscle-coach/id6478009374)

**Features:** macOS Compatibility

**In-app purchases:** none


### Group Challenge Runner

[App page](https://appshunter.io/ios/app/group-challenge-runner/id6753975475)

Build healthy habits with friends by joining or creating shared lifestyle challenges. Track daily progress, stay motivated together, and achieve goals with group accountability and support.

**Highlights:** Create or join shared health challenges, Track daily progress and log activities, Invite friends and grow your group, Customizable challenge rules and durations, Sync with Apple Health for automatic tracking, Social features for competition and collaboration, Photo check-ins for proof of completion

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium (Monthly) V5 | $2.99 | per month |
| Challenge Crew Premium (Monthly) V4 | $3.99 | per month |
| Challenge Crew Premium (Yearly) V4 | $29.99 | per year |


## Frequently asked questions

### Is Muscle free?

Muscle is free to download, with no in-app purchases.

### Is Group Challenge Runner free?

Group Challenge Runner is free to download, with in-app purchases available.

### Do Muscle or Group Challenge Runner have ads?

Both Muscle and Group Challenge Runner show ads.

### Which is updated more often, Muscle or Group Challenge Runner?

Muscle ships an update fortnightly, and Group Challenge Runner every 4 days. Most recently, Muscle was updated on May 18, 2026 and Group Challenge Runner on September 19, 2026.

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