# Startelf 11 vs WhistleOS

The clearest difference is update cadence: Startelf 11 at every 6 days against WhistleOS's fortnightly. Startelf 11 also leads on iOS requirement (15.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Startelf 11 sells 2 in-app purchases, starting at $3.99 per month and WhistleOS sells 2 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

Startelf 11 ships an update every 6 days, WhistleOS fortnightly. The most recent releases landed on October 27, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Startelf 11 | WhistleOS |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 6 days** | Fortnightly |
| Size | 33 MB | 32 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [David Krachler](https://appshunter.io/developer/1065237234) | [Lorand Barabas](https://appshunter.io/developer/6814266536) |

## What reviewers say

### Startelf 11

[App page](https://appshunter.io/ios/app/startelf-11/id6482231916)

**Features:** Apple Watch app

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Startelf Manager | $3.99 | per month |
| Startelf Manager | $44.99 | per year |


### 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 Startelf 11 free?

Startelf 11 is free to download, with in-app purchases available.

### Is WhistleOS free?

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

### Do Startelf 11 or WhistleOS have ads?

Neither Startelf 11 nor WhistleOS shows ads.

### Which is updated more often, Startelf 11 or WhistleOS?

Startelf 11 ships an update every 6 days, and WhistleOS fortnightly. Most recently, Startelf 11 was updated on October 27, 2026 and WhistleOS on October 24, 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.*