# PiPO vs YYサイレンアラート

The clearest difference is price: YYサイレンアラート at Free against PiPO's $2.99. YYサイレンアラート also leads on update cadence (monthly vs every 14 months). PiPO's advantage is review sentiment (71% vs 50%) and iOS requirement (7.1 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; PiPO costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

PiPO ships an update every 14 months, YYサイレンアラート monthly. The most recent releases landed on September 26, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | PiPO | YYサイレンアラート |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/pipo/id983719927/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | **71.4% of reviews** | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 14 months | **Monthly** |
| Monetization | Paid | **Free** |
| Size | 39 MB | 6 MB |
| Requires iOS | **7.1** | 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

### PiPO

[App page](https://appshunter.io/ios/app/pipo/id983719927)

This app simulates Japanese ambulance sirens and emergency vehicle sounds. It features recorded siren sounds, voice recordings, and a flashing light effect. It is not a real siren amplifier but a sound playback application.

**Highlights:** Ambulance siren sounds, Emergency vehicle voice recordings, Record and playback custom audio, Flashing light effect, Automatic siren function

**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 PiPO free?

PiPO costs $2.99, 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 PiPO or YYサイレンアラート have ads?

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

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

PiPO ships an update every 14 months, and YYサイレンアラート monthly. Most recently, PiPO was updated on September 26, 2026 and YYサイレンアラート on September 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.*