# qw vs Cellular Alarm Contact Sensor

The clearest difference is update cadence: Cellular Alarm Contact Sensor at every 3 weeks against qw's every 20 months. Cellular Alarm Contact Sensor also leads on iOS requirement (13.4 vs 15.0). 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.

qw ships an update every 20 months, Cellular Alarm Contact Sensor every 3 weeks. The most recent releases landed on October 19, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | qw | Cellular Alarm Contact Sensor |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 20 months | **Every 3 weeks** |
| Size | 1 MB | 2 MB |
| Requires iOS | 15.0 | **13.4** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Rainer Hagemann](https://appshunter.io/developer/980943714) | [Robert Taraszka](https://appshunter.io/developer/1518710123) |

## What reviewers say

### qw

[App page](https://appshunter.io/ios/app/qw-data-certchecker/id1133131608)

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

**In-app purchases:** none


### Cellular Alarm Contact Sensor

[App page](https://appshunter.io/ios/app/cellular-alarm-contact-sensor/id1518710124)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is qw free?

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

### Is Cellular Alarm Contact Sensor free?

Cellular Alarm Contact Sensor is free to download, with no in-app purchases.

### Do qw or Cellular Alarm Contact Sensor have ads?

Neither qw nor Cellular Alarm Contact Sensor shows ads.

### Which is updated more often, qw or Cellular Alarm Contact Sensor?

qw ships an update every 20 months, and Cellular Alarm Contact Sensor every 3 weeks. Most recently, qw was updated on October 19, 2026 and Cellular Alarm Contact Sensor on October 27, 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.*