# Metal Detector and Spy Camera vs CO2 sensor

The clearest difference is rating: Metal Detector and Spy Camera at 4.2 against CO2 sensor's 3.4. Metal Detector and Spy Camera also leads on ratings volume (11K vs 7) and update cadence (every 5 months vs every 12 months). CO2 sensor's advantage is in-app purchases (none vs 6) and device support (4 vs 2). On price and ads there is nothing between them.

Both are free to download. Metal Detector and Spy Camera sells 4 in-app purchases, starting at $4.99 per 7 days. CO2 sensor asks for nothing beyond the download.

Metal Detector and Spy Camera holds the better App Store score, 4.2 against 3.4. That said, the two scores are not equally well evidenced: Metal Detector and Spy Camera has 11K ratings behind it against 7, so its average is the more settled of the two.

Metal Detector and Spy Camera ships an update every 5 months, CO2 sensor every 12 months. The most recent releases landed on October 29, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Metal Detector and Spy Camera | CO2 sensor |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.2 (11K ratings)](https://appshunter.io/ios/app/metal-detector-and-spy-camera/id409682366/reviews)** | [3.4 (7 ratings)](https://appshunter.io/ios/app/co2-sensor/id1643286074/reviews) |
| Number of ratings | **11K** | 7 |
| Positive reviews | 57.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 5 months** | Every 12 months |
| Monetization | Subscription | **Free** |
| Size | 80 MB | 0 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Giorgia De Giorgi](https://appshunter.io/developer/1721878045) | [sighmon](https://appshunter.io/developer/377815161) |

## What reviewers say

### Metal Detector and Spy Camera

[App page](https://appshunter.io/ios/app/metal-detector-and-spy-camera/id409682366)

This app acts as a versatile detection toolkit, helping you find hidden metal objects, magnetic fields, and potential spy cameras. It also includes tools to check your WiFi network for unknown devices and scan your email for data breaches, enhancing your safety and aiding home improvement projects.

**Highlights:** Metal detector, Magnetic field detector, WiFi device scanner, Hidden camera finder, Email breach checker, Stud finder

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly premium | $4.99 | per 7 days |
| Weekly premium | $4.99 | per 7 days |
| Yearly premium | $9.99 | per year |
| Yearly premium | $9.99 | per year |

**What reviewers like**

- 🚀 Works well
- 👍 Helpful for finding metal objects
- 🔍 Accurate metal detection
- 💡 Useful for finding property markers
- 👍 Easy to use

**What reviewers complain about**

- 🐛 Doesn't work consistently
- 🐛 Inaccurate readings
- 🔒 Potential privacy/security concerns
- 💰 Subscription-based model
- 🔋 High battery consumption

**Reported bugs**

- Crashes frequently
- Sensitivity issues
- Inconsistent performance

**Requested features**

- More detailed instructions on how to use
- Ability to detect more types of metals
- Improved sensitivity and accuracy
- Compatibility with more phone models


### CO2 sensor

[App page](https://appshunter.io/ios/app/co2-sensor/id1643286074)

Monitor CO2, temperature, and humidity levels in real-time using a Bluetooth sensor. Save readings with location data and sync them across Apple devices via iCloud. View historical data on a map.

**Highlights:** Real-time CO2, temperature, and humidity readings, Bluetooth sensor integration, Save readings with location, iCloud sync across devices, Map view of saved readings, Open source code available

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Metal Detector and Spy Camera free?

Metal Detector and Spy Camera is free to download, with in-app purchases available.

### Is CO2 sensor free?

CO2 sensor is free to download, with no in-app purchases.

### Which has better reviews, Metal Detector and Spy Camera or CO2 sensor?

Metal Detector and Spy Camera is rated higher. Metal Detector and Spy Camera averages 4.2 out of 5 from 11K ratings, while CO2 sensor averages 3.4 from 7 ratings.

### Do Metal Detector and Spy Camera or CO2 sensor have ads?

Neither Metal Detector and Spy Camera nor CO2 sensor shows ads.

### Which is updated more often, Metal Detector and Spy Camera or CO2 sensor?

Metal Detector and Spy Camera ships an update every 5 months, and CO2 sensor every 12 months. Most recently, Metal Detector and Spy Camera was updated on October 29, 2026 and CO2 sensor on October 24, 2026.

---

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