monitorCat vs X
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
monitorCat
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A lot of smoke/CO detector can NOT send internet notification other than generating loud or pitch noise alarm, the App use your smart phone to listen to the alarm and send real time gmail notification, by which, we extend life to our old smart phone to be as wireless assistant, what's more, we don't have to buy expensive wireless smoke/CO detector and pay monthly fee, the App is free!
X
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With the X-Series Gas Detection mobile app, reading status and configuring your unit is simple and easy. Connect to the device using Bluetooth communications with the push of a button. Once connected, users can interact with X30 & X50 gas monitoring units and X10 remote sensors from their mobile device. From commissioning to maintenance activities, features and functions of the app include: -View operating status and gas concentration at-a-glance -Configure settings at any time, including monitoring levels, outputs, and gas type -Calibrate with a guided step-by-step process or conduct a bump test -Test outputs from the device, including analog, relays, audiovisual indicators, and Modbus communications The X-Series App helps make installation and integration of your unit straightforward. During its lifetime, maintenance activities are also supported by the app. If a sensor needs to be added, changed, or replaced, the mobile app enables gas and sensor configuration updates directly on your phone or tablet. Calibration reminders, reports, and key troubleshooting information like fault codes are accessible for device support. Demo mode is available on the app to explore functionality without needing to connect to a live device. Whether you need to view, test, or re-configure your X10 / X30 / X50 system, the X-Series Gas Detection App provides a user-friendly interface to work with your devices.
Screenshots
Verdict
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.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
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.
| Parameter | monitorCat | X |
|---|---|---|
| Price | Free | Free |
| Update frequency | Fortnightly | Every 9 days โ better |
| Ads | No โ better | Yes |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 8.0 โ better | 14.0 |
| Further details โ not scored | ||
| Size | 8 MB | 22 MB |
| Age rating | 4+ | 4+ |
| Developer | Wei Zhao | MSA - The Safety Company |
In-app purchases
monitorCat
No in-app purchases
X
No in-app purchases









