# YYサイレンアラート vs Sign Motion

The clearest difference is update cadence: Sign Motion at daily against YYサイレンアラート's monthly. YYサイレンアラート's advantage is iOS requirement (15.0 vs 18.0). On price, ads, 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.

YYサイレンアラート ships an update monthly, Sign Motion daily. The most recent releases landed on October 10, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | YYサイレンアラート | Sign Motion |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Daily** |
| Monetization | Free | — |
| Size | 6 MB | 38 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [株式会社エクォス・リサーチ](https://appshunter.io/developer/1483010608) | [Fumikazu Kondo](https://appshunter.io/developer/1895556530) |

## What reviewers say

### YYサイレンアラート

[App page](https://appshunter.io/ios/app/yy/id6450823634)

This utility app visualizes important sounds like sirens and alarms, alerting users through visual cues and vibrations. It helps individuals who have difficulty hearing these sounds or want to be more aware of their auditory environment. The app detects various sounds, from emergency vehicles to everyday noises.

**Highlights:** Visualizes siren sounds, Alerts via display and vibration, Detects emergency vehicle sounds, Recognizes car horns and bicycle bells, Identifies fire alarms and intercoms, Visualizes speech, music, and breaking glass sounds

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

**In-app purchases:** none


### Sign Motion

[App page](https://appshunter.io/ios/app/sign-motion/id6818924864)

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

**In-app purchases:** none


## Frequently asked questions

### Is YYサイレンアラート free?

YYサイレンアラート is free to download, with no in-app purchases.

### Is Sign Motion free?

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

### Do YYサイレンアラート or Sign Motion have ads?

Neither YYサイレンアラート nor Sign Motion shows ads.

### Which is updated more often, YYサイレンアラート or Sign Motion?

YYサイレンアラート ships an update monthly, and Sign Motion daily. Most recently, YYサイレンアラート was updated on October 10, 2026 and Sign Motion 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.*