# Koptaco Operations vs Referee Yellow card, Whistle

The clearest difference is ads: Koptaco Operations at none against Referee Yellow card, Whistle's shown. Koptaco Operations also leads on iOS requirement (13.0 vs 15.6). On price, update cadence, in-app purchases and device support there is nothing between them.

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

Both ship on a similar rhythm, roughly every 2 months. Both last shipped on November 3, 2026.

## The numbers

| Metric | Koptaco Operations | Referee Yellow card, Whistle |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.7 (52 ratings)](https://appshunter.io/ios/app/referee-yellow-card-whistle/id6449401491/reviews)** |
| Number of ratings | — | **52** |
| Positive reviews | — | 71.4% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | — | Ad-supported |
| Size | 30 MB | 15 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Codevlabs Ltd](https://appshunter.io/developer/1346183017) | [Ryouhei Azuma](https://appshunter.io/developer/1353297781) |

## What reviewers say

### Koptaco Operations

[App page](https://appshunter.io/ios/app/koptaco-operations/id1662270968)

**Features:** macOS Compatibility

**In-app purchases:** none


### Referee Yellow card, Whistle

[App page](https://appshunter.io/ios/app/referee-yellow-card-whistle/id6449401491)

This utility app provides a digital referee toolkit for sports and other situations. It features a whistle sound and full-screen display of various colored cards for judgment calls. Designed for simplicity, it's suitable for games, training, or even pranks.

**Highlights:** Whistle sound functionality, Full-screen yellow, red, orange, and green cards, Simple and easy-to-use interface, Suitable for sports refereeing, Useful for training and games, Can be used for pranks

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

**In-app purchases:** none


## Frequently asked questions

### Is Koptaco Operations free?

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

### Is Referee Yellow card, Whistle free?

Referee Yellow card, Whistle is free to download, with no in-app purchases.

### Do Koptaco Operations or Referee Yellow card, Whistle have ads?

Referee Yellow card, Whistle shows ads; Koptaco Operations does not.

### Which is updated more often, Koptaco Operations or Referee Yellow card, Whistle?

Koptaco Operations ships an update every 2 months, and Referee Yellow card, Whistle every 2 months. Most recently, Koptaco Operations was updated on November 3, 2026 and Referee Yellow card, Whistle on November 3, 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.*