# O3 Alarm vs GPS SMS Commands

The clearest difference is update cadence: O3 Alarm at every 7 months against GPS SMS Commands's every 47 months. O3 Alarm also leads on iOS requirement (7.0 vs 13.0). On price, review sentiment, 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.

O3 Alarm ships an update every 7 months, GPS SMS Commands every 47 months. The most recent releases landed on October 24, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | O3 Alarm | GPS SMS Commands |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/o3-alarm/id950579931/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 7 months** | Every 47 months |
| Monetization | Free | Free |
| Size | 71 MB | 16 MB |
| Requires iOS | **7.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Chuango Security Technology Corporation](https://appshunter.io/developer/534068551) | [Dimitar Stefanovski](https://appshunter.io/developer/1319304988) |

## What reviewers say

### O3 Alarm

[App page](https://appshunter.io/ios/app/o3-alarm/id950579931)

This security system app provides 360° protection for homes and small businesses. It allows remote monitoring, control of sensors, and customizable alerts for intrusions, floods, smoke, or gas. Manage your system, set routines, and receive notifications for enhanced safety and convenience.

**Highlights:** 360° protection with up to 50 wireless sensors, Intrusion, flood, smoke, and gas detection alerts, Customizable entry and exit delays, Adjustable siren duration and volume (up to 95 dB), Smartphone, remote control, and panel interaction, RFID tag management and SMS notifications, Supports multiple users and smartphones

**In-app purchases:** none


### GPS SMS Commands

[App page](https://appshunter.io/ios/app/gps-sms-commands/id1487765327)

Configure your GPS tracking device remotely using SMS messages. This app provides a comprehensive database of commands, allowing you to search by device model and easily send configurations. Persist your device information for quick access.

**Highlights:** Persist GPS devices, Database of SMS commands, Search commands by device model, Easy SMS sending, Remote configuration changes

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is O3 Alarm free?

O3 Alarm is free to download, with no in-app purchases.

### Is GPS SMS Commands free?

GPS SMS Commands is free to download, with no in-app purchases.

### Do O3 Alarm or GPS SMS Commands have ads?

Neither O3 Alarm nor GPS SMS Commands shows ads.

### Which is updated more often, O3 Alarm or GPS SMS Commands?

O3 Alarm ships an update every 7 months, and GPS SMS Commands every 47 months. Most recently, O3 Alarm was updated on October 24, 2026 and GPS SMS Commands on October 19, 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.*