# Uuu vs YYサイレンアラート

The clearest difference is review sentiment: YYサイレンアラート at 50% against Uuu's 0%. YYサイレンアラート also leads on price (Free vs $1.99) and update cadence (monthly vs every 95 months). Uuu's advantage is iOS requirement (12.0 vs 15.0). On ads, in-app purchases and device support there is nothing between them.

YYサイレンアラート is free to download; Uuu costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Uuu ships an update every 95 months, YYサイレンアラート monthly. The most recent releases landed on September 22, 2026 and August 16, 2026 respectively.

## The numbers

| Metric | Uuu | YYサイレンアラート |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Positive reviews | 0.0% of reviews | **50.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 95 months | **Monthly** |
| Monetization | Paid | **Free** |
| Size | 24 MB | 6 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Kaji Takatsugu](https://appshunter.io/developer/465688467) | [株式会社エクォス・リサーチ](https://appshunter.io/developer/1483010608) |

## What reviewers say

### Uuu

[App page](https://appshunter.io/ios/app/uuu/id1154032477)

This app simulates Japanese patrol car sirens and lights. It features pre-recorded siren sounds, the ability to record and play back custom audio, and a flashing light effect. It does not include a siren amplifier function.

**Highlights:** Pre-recorded siren sounds, Custom audio recording and playback, Flashing light effect, Simulates patrol car sirens, Record up to 5 channels of audio

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is Uuu free?

Uuu costs $1.99, with no in-app purchases.

### 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.

### Do Uuu or YYサイレンアラート have ads?

Neither Uuu nor YYサイレンアラート shows ads.

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

Uuu ships an update every 95 months, and YYサイレンアラート monthly. Most recently, Uuu was updated on September 22, 2026 and YYサイレンアラート on August 16, 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.*