# Referee Yellow card, Whistle vs E.C.H.O

The clearest difference is ads: E.C.H.O at none against Referee Yellow card, Whistle's shown. On price, in-app purchases, device support and iOS requirement there is nothing between them.

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

## The numbers

| Metric | Referee Yellow card, Whistle | E.C.H.O |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (50 ratings)](https://appshunter.io/ios/app/referee-yellow-card-whistle/id6449401491/reviews)** | — |
| Number of ratings | **50** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | — |
| Monetization | Ad-supported | — |
| Size | 15 MB | 234 MB |
| Requires iOS | **15.6** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Ryouhei Azuma](https://appshunter.io/developer/1353297781) | [Adam Aerospace CO. LLC](https://appshunter.io/developer/6776310683) |

## What reviewers say

### 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


### E.C.H.O

[App page](https://appshunter.io/ios/app/echo/id6776310681)

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

**In-app purchases:** none


## Frequently asked questions

### Is Referee Yellow card, Whistle free?

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

### Is E.C.H.O free?

E.C.H.O is free to download, with no in-app purchases.

### Do Referee Yellow card, Whistle or E.C.H.O have ads?

Referee Yellow card, Whistle shows ads; E.C.H.O does not.

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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.*