# G3 Alarm vs Magnetic Sensor

The clearest difference is ads: G3 Alarm at none against Magnetic Sensor's shown. G3 Alarm also leads on iOS requirement (7.0 vs 15.1). Magnetic Sensor's advantage is update cadence (fortnightly vs every 3 months). On price, 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.

G3 Alarm ships an update every 3 months, Magnetic Sensor fortnightly. The most recent releases landed on November 1, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | G3 Alarm | Magnetic Sensor |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/g3-alarm/id536065380/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Fortnightly** |
| Monetization | Free | — |
| Size | 57 MB | 25 MB |
| Requires iOS | **7.0** | 15.1 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Chuango Security Technology Corporation](https://appshunter.io/developer/534068551) | [Seonggon Sim](https://appshunter.io/developer/1565259950) |

## What reviewers say

### G3 Alarm

[App page](https://appshunter.io/ios/app/g3-alarm/id536065380)

This app allows you to control and monitor a GSM/SMS alarm system remotely. Arm or disarm your system, receive alerts, and adjust settings via your smartphone. It's designed for easy installation and use with a focus on security.

**Highlights:** Remote arm/disarm, Receive intrusion alerts, Adjust system settings, Voice memo recording, Listen-in functionality, Control via phone call/SMS

**In-app purchases:** none


### Magnetic Sensor

[App page](https://appshunter.io/ios/app/magnetic-sensor/id6764468454)

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

**In-app purchases:** none


## Frequently asked questions

### Is G3 Alarm free?

G3 Alarm is free to download, with no in-app purchases.

### Is Magnetic Sensor free?

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

### Do G3 Alarm or Magnetic Sensor have ads?

Magnetic Sensor shows ads; G3 Alarm does not.

### Which is updated more often, G3 Alarm or Magnetic Sensor?

G3 Alarm ships an update every 3 months, and Magnetic Sensor fortnightly. Most recently, G3 Alarm was updated on November 1, 2026 and Magnetic Sensor on October 31, 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.*