# Referee Yellow card, Whistle vs Nova Mobile Security

The clearest difference is ads: Nova Mobile Security at none against Referee Yellow card, Whistle's shown. Nova Mobile Security also leads on update cadence (every 3 weeks vs every 2 months). 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.

Referee Yellow card, Whistle ships an update every 2 months, Nova Mobile Security every 3 weeks. The most recent releases landed on October 30, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Referee Yellow card, Whistle | Nova Mobile Security |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (51 ratings)](https://appshunter.io/ios/app/referee-yellow-card-whistle/id6449401491/reviews)** | — |
| Number of ratings | **51** | — |
| Positive reviews | 71.4% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | Ad-supported | — |
| Size | 15 MB | 87 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ryouhei Azuma](https://appshunter.io/developer/1353297781) | [Pera Soft Dijital Cozumler Anonim Sirketi](https://appshunter.io/developer/1822559439) |

## 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


### Nova Mobile Security

[App page](https://appshunter.io/ios/app/nova-mobile-security/id6764043966)

**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 Nova Mobile Security free?

Nova Mobile Security is free to download, with no in-app purchases.

### Do Referee Yellow card, Whistle or Nova Mobile Security have ads?

Referee Yellow card, Whistle shows ads; Nova Mobile Security does not.

### Which is updated more often, Referee Yellow card, Whistle or Nova Mobile Security?

Referee Yellow card, Whistle ships an update every 2 months, and Nova Mobile Security every 3 weeks. Most recently, Referee Yellow card, Whistle was updated on October 30, 2026 and Nova Mobile Security on October 28, 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.*