monitorCat vs Perimeter
Price, ratings, monetisation and update history for both apps, side by side — 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!
Perimeter
This AI-powered security app detects potential threats before they occur. It uses unique lights and sounds to warn individuals and deter crime before it happens.
- AI threat detection
- Proactive crime deterrence
- Neighbor Safe™ lights
- Audible warnings
- Driveway monitoring
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Finally, deter theft before it happens. By detecting and warning people before they enter your driveway, your AI named Ava can determine whether to deter any would-be criminals using unique Neighbor Safe™ lights and sounds.
Screenshots
Verdict
The clearest difference is iOS requirement: monitorCat at 8.0 against Perimeter's 11.0. On price, update cadence, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · 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, Perimeter every 3 weeks. The most recent releases landed on October 12, 2026 and October 7, 2026 respectively.
| Parameter | monitorCat | Perimeter |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (2 ratings) — better |
| Number of ratings | — | 2 — better |
| Update frequency | Fortnightly — better | Every 3 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 8.0 — better | 11.0 |
| Further details — not scored | ||
| Size | 8 MB | 54 MB |
| Age rating | 4+ | 4+ |
| Developer | Wei Zhao | PERIMETER AI INC. |
In-app purchases
monitorCat
No in-app purchases
Perimeter
No in-app purchases
