# TeamWhistle vs WhistleOS

The clearest difference is in-app purchases: TeamWhistle at none against WhistleOS's 2. TeamWhistle also leads on iOS requirement (13.0 vs 17.0). WhistleOS's advantage is update cadence (every 11 days vs every 6 weeks). On price, ads and device support there is nothing between them.

Both are free to download. WhistleOS sells 2 in-app purchases, starting at $3.99 per month. TeamWhistle asks for nothing beyond the download.

TeamWhistle ships an update every 6 weeks, WhistleOS every 11 days. The most recent releases landed on October 28, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | TeamWhistle | WhistleOS |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 11 days** |
| Size | 9 MB | 32 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Homerus Hoogland](https://appshunter.io/developer/1872604288) | [Lorand Barabas](https://appshunter.io/developer/6814266536) |

## What reviewers say

### TeamWhistle

[App page](https://appshunter.io/ios/app/teamwhistle/id6758384452)

**In-app purchases:** none


### WhistleOS

[App page](https://appshunter.io/ios/app/whistleos-referee-app/id6814266534)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| WhistleOS Pro monthly | $3.99 | per month |
| WhistleOS Pro yearly | $44.99 | per year |


## Frequently asked questions

### Is TeamWhistle free?

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

### Is WhistleOS free?

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

### Do TeamWhistle or WhistleOS have ads?

Neither TeamWhistle nor WhistleOS shows ads.

### Which is updated more often, TeamWhistle or WhistleOS?

TeamWhistle ships an update every 6 weeks, and WhistleOS every 11 days. Most recently, TeamWhistle was updated on October 28, 2026 and WhistleOS on October 31, 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.*