# SOSホイッスル vs SOS Light

The clearest difference is in-app purchases: SOSホイッスル at none against SOS Light's 1. SOSホイッスル also leads on update cadence (every 5 days vs every 4 months) and iOS requirement (8.0 vs 15.3). On price, ads and device support there is nothing between them.

Both are free to download. SOS Light sells 1 in-app purchase, starting at $0.99 per year. SOSホイッスル asks for nothing beyond the download.

SOSホイッスル ships an update every 5 days, SOS Light every 4 months. The most recent releases landed on October 7, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | SOSホイッスル | SOS Light |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 4 months |
| Monetization | Free | — |
| Size | 19 MB | 6 MB |
| Requires iOS | **8.0** | 15.3 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ComNetSystem](https://appshunter.io/developer/697816110) | [Pieter Yoshua Natanael](https://appshunter.io/developer/1657373397) |

## 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 Light

[App page](https://appshunter.io/ios/app/sos-light-emergency/id6504213303)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Version | $0.99 | per year |


## 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 Light free?

SOS Light is free to download, with in-app purchases available.

### Do SOSホイッスル or SOS Light have ads?

Neither SOSホイッスル nor SOS Light shows ads.

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

SOSホイッスル ships an update every 5 days, and SOS Light every 4 months. Most recently, SOSホイッスル was updated on October 7, 2026 and SOS Light on October 13, 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.*