# Motion Detector Camera vs SentryBlack

The clearest difference is price: SentryBlack at Free against Motion Detector Camera's $3.99. SentryBlack also leads on update cadence (fortnightly vs every 27 months). Motion Detector Camera's advantage is in-app purchases (none vs 2) and ads (none vs shown). On device support there is nothing between them.

SentryBlack is free to download; Motion Detector Camera costs $3.99 up front. SentryBlack sells 2 in-app purchases, starting at $4.99 per month. Motion Detector Camera asks for nothing beyond the download.

Motion Detector Camera ships an update every 27 months, SentryBlack fortnightly. The most recent releases landed on October 10, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Motion Detector Camera | SentryBlack |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | **[2.0 (4 ratings)](https://appshunter.io/ios/app/motion-detector-camera/id1132847115/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 12.5% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 27 months | **Fortnightly** |
| Monetization | Paid | — |
| Size | 43 MB | 17 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Heng Jia Liang](https://appshunter.io/developer/1532000635) | [Matthew Wong](https://appshunter.io/developer/6774040057) |

## What reviewers say

### Motion Detector Camera

[App page](https://appshunter.io/ios/app/motion-detector-camera/id1132847115)

This app transforms your device into a motion-detecting security camera. It uses advanced algorithms to detect movement, sound an alert, and automatically record video or capture images of detected objects. It's ideal for monitoring pets, securing your home, or any surveillance needs.

**Highlights:** Advanced motion detection algorithm, Automatic recording and image capture, Front/back camera support, Adjustable video/image sizes, Human, cat, or dog detection, Dimmable screen option, Date, time, and object type embedding

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

**In-app purchases:** none


### SentryBlack

[App page](https://appshunter.io/ios/app/sentryblack-security-camera/id6790313702)

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SentryBlack Pro (Monthly) | $4.99 | per month |
| SentryBlack Pro (Yearly) | $29.99 | per year |


## Frequently asked questions

### Is Motion Detector Camera free?

Motion Detector Camera costs $3.99, with no in-app purchases.

### Is SentryBlack free?

SentryBlack is free to download, with in-app purchases available.

### Do Motion Detector Camera or SentryBlack have ads?

SentryBlack shows ads; Motion Detector Camera does not.

### Which is updated more often, Motion Detector Camera or SentryBlack?

Motion Detector Camera ships an update every 27 months, and SentryBlack fortnightly. Most recently, Motion Detector Camera was updated on October 10, 2026 and SentryBlack on October 3, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*