# AthleteOS vs UnderForge

The clearest difference is in-app purchases: AthleteOS at none against UnderForge's 3. AthleteOS also leads on update cadence (every 4 days vs every 10 days). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. UnderForge sells 3 in-app purchases, starting at $3.99 per 7 days. AthleteOS asks for nothing beyond the download.

AthleteOS ships an update every 4 days, UnderForge every 10 days. The most recent releases landed on November 5, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | AthleteOS | UnderForge |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 10 days |
| Size | 228 MB | 128 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [MESAN DIGITAL VENTURES LTD](https://appshunter.io/developer/904821818) | [Venture CO Group Korlatolt Felelossegu Tarsasag](https://appshunter.io/developer/6800294425) |

## What reviewers say

### AthleteOS

[App page](https://appshunter.io/ios/app/athleteos/id6757597790)

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

**In-app purchases:** none


### UnderForge

[App page](https://appshunter.io/ios/app/underforge/id6758098630)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| UnderForge Premium Weekly | $3.99 | per 7 days |
| UnderForge Premium Quarterly | $29.99 | per 3 months |
| UnderForge Premium Yearly | $89.99 | per year |


## Frequently asked questions

### Is AthleteOS free?

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

### Is UnderForge free?

UnderForge is free to download, with in-app purchases available.

### Do AthleteOS or UnderForge have ads?

Neither AthleteOS nor UnderForge shows ads.

### Which is updated more often, AthleteOS or UnderForge?

AthleteOS ships an update every 4 days, and UnderForge every 10 days. Most recently, AthleteOS was updated on November 5, 2026 and UnderForge on November 9, 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.*