# monitorCat vs X

The clearest difference is ads: monitorCat at none against X's shown. monitorCat also leads on iOS requirement (8.0 vs 14.0). On price, update cadence, 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.

monitorCat ships an update fortnightly, X every 9 days. The most recent releases landed on November 2, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | monitorCat | X |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Fortnightly | **Every 9 days** |
| Size | 8 MB | 22 MB |
| Requires iOS | **8.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Wei Zhao](https://appshunter.io/developer/981750643) | [MSA - The Safety Company](https://appshunter.io/developer/482957840) |

## What reviewers say

### monitorCat

[App page](https://appshunter.io/ios/app/monitorcat/id1385674787)

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

**In-app purchases:** none


### X

[App page](https://appshunter.io/ios/app/x-series-gas-detection/id6746219844)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is monitorCat free?

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

### Is X free?

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

### Do monitorCat or X have ads?

X shows ads; monitorCat does not.

### Which is updated more often, monitorCat or X?

monitorCat ships an update fortnightly, and X every 9 days. Most recently, monitorCat was updated on November 2, 2026 and X 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.*