# US Muscle vs Internal Combustion Engine ICE

The clearest difference is in-app purchases: US Muscle at none against Internal Combustion Engine ICE's 1. US Muscle also leads on ads (none vs shown) and iOS requirement (9.0 vs 13.0). Internal Combustion Engine ICE's advantage is update cadence (every 2 months vs every 5 months). On price and device support there is nothing between them.

Both are free to download. Internal Combustion Engine ICE sells 1 one-off in-app purchase. US Muscle asks for nothing beyond the download.

US Muscle ships an update every 5 months, Internal Combustion Engine ICE every 2 months. The most recent releases landed on September 17, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | US Muscle | Internal Combustion Engine ICE |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 5 months | **Every 2 months** |
| Size | 186 MB | 29 MB |
| Requires iOS | **9.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Total Web Systems Limited](https://appshunter.io/developer/826563624) | [Sylviory Dubuisson](https://appshunter.io/developer/1584878614) |

## What reviewers say

### US Muscle

[App page](https://appshunter.io/ios/app/us-muscle/id1284019233)

**Features:** macOS Compatibility

**In-app purchases:** none


### Internal Combustion Engine ICE

[App page](https://appshunter.io/ios/app/internal-combustion-engine-ice/id1464409462)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |


## Frequently asked questions

### Is US Muscle free?

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

### Is Internal Combustion Engine ICE free?

Internal Combustion Engine ICE is free to download, with in-app purchases available.

### Do US Muscle or Internal Combustion Engine ICE have ads?

Internal Combustion Engine ICE shows ads; US Muscle does not.

### Which is updated more often, US Muscle or Internal Combustion Engine ICE?

US Muscle ships an update every 5 months, and Internal Combustion Engine ICE every 2 months. Most recently, US Muscle was updated on September 17, 2026 and Internal Combustion Engine ICE on September 16, 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.*