# SOSホイッスル vs SOS

The clearest difference is update cadence: SOSホイッスル at every 5 days against SOS's every 3 weeks. SOSホイッスル also leads on device support (3 vs 1) and iOS requirement (8.0 vs 17.0). On price, ads and in-app purchases there is nothing between them.

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

SOSホイッスル ships an update every 5 days, SOS every 3 weeks. The most recent releases landed on October 7, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | SOSホイッスル | SOS |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 3 weeks |
| Monetization | Free | — |
| Size | 19 MB | 6 MB |
| Requires iOS | **8.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [ComNetSystem](https://appshunter.io/developer/697816110) | [Orlando Costa](https://appshunter.io/developer/6780307902) |

## What reviewers say

### SOSホイッスル

[App page](https://appshunter.io/ios/app/sos/id1301828783)

This utility app produces a loud whistle sound and a blinking light when a button is pressed, designed to help users signal for help in emergencies. It offers customizable modes for both the whistle and light functions.

**Highlights:** Whistle sound on button press, Blinking light on button press, Adjustable whistle modes, Adjustable light modes, Emergency signaling tool

**Features:** macOS Compatibility

**In-app purchases:** none


### SOS

[App page](https://appshunter.io/ios/app/sos-global/id6780307900)

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

**In-app purchases:** none


## Frequently asked questions

### Is SOSホイッスル free?

SOSホイッスル is free to download, with no in-app purchases.

### Is SOS free?

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

### Do SOSホイッスル or SOS have ads?

Neither SOSホイッスル nor SOS shows ads.

### Which is updated more often, SOSホイッスル or SOS?

SOSホイッスル ships an update every 5 days, and SOS every 3 weeks. Most recently, SOSホイッスル was updated on October 7, 2026 and SOS on October 8, 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.*