# Fire Alarm System vs VTC VSS

The clearest difference is update cadence: Fire Alarm System at every 5 days against VTC VSS's every 6 weeks. Fire Alarm System also leads on iOS requirement (12.4 vs 14.0). 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.

Fire Alarm System ships an update every 5 days, VTC VSS every 6 weeks. The most recent releases landed on September 19, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Fire Alarm System | VTC VSS |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 6 weeks |
| Size | 33 MB | 253 MB |
| Requires iOS | **12.4** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Hoan Ho](https://appshunter.io/developer/1631498878) | [VTC TELECOMMUNICATIONS JOINT STOCK COMPANY](https://appshunter.io/developer/1419367682) |

## What reviewers say

### Fire Alarm System

[App page](https://appshunter.io/ios/app/fire-alarm-system/id6479693179)

**Features:** macOS Compatibility

**In-app purchases:** none


### VTC VSS

[App page](https://appshunter.io/ios/app/vtc-vss/id6752933075)

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

**In-app purchases:** none


## Frequently asked questions

### Is Fire Alarm System free?

Fire Alarm System is free to download, with no in-app purchases.

### Is VTC VSS free?

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

### Do Fire Alarm System or VTC VSS have ads?

Neither Fire Alarm System nor VTC VSS shows ads.

### Which is updated more often, Fire Alarm System or VTC VSS?

Fire Alarm System ships an update every 5 days, and VTC VSS every 6 weeks. Most recently, Fire Alarm System was updated on September 19, 2026 and VTC VSS on September 18, 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.*