# Performance Unit vs MuscleLight

The clearest difference is device support: Performance Unit at 4 against MuscleLight's 1. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Performance Unit ships an update every 6 weeks, MuscleLight monthly. The most recent releases landed on May 17, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | Performance Unit | MuscleLight |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Monthly** |
| Size | 205 MB | 52 MB |
| Requires iOS | **15.1** | 16.4 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [Selkrig Performance](https://appshunter.io/developer/1515613082) | [Recolth Oy](https://appshunter.io/developer/1814360098) |

## What reviewers say

### Performance Unit

[App page](https://appshunter.io/ios/app/performance-unit/id1515613083)

**Features:** Apple Wallet

**In-app purchases:** none


### MuscleLight

[App page](https://appshunter.io/ios/app/musclelight/id6745891466)

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

**In-app purchases:** none


## Frequently asked questions

### Is Performance Unit free?

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

### Is MuscleLight free?

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

### Do Performance Unit or MuscleLight have ads?

Neither Performance Unit nor MuscleLight shows ads.

### Which is updated more often, Performance Unit or MuscleLight?

Performance Unit ships an update every 6 weeks, and MuscleLight monthly. Most recently, Performance Unit was updated on May 17, 2026 and MuscleLight on September 8, 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.*