# CO2 sensor vs Hidden Camera Detector FindSpy

The clearest difference is rating: Hidden Camera Detector FindSpy at 4.4 against CO2 sensor's 2.7. Hidden Camera Detector FindSpy also leads on update cadence (every 4 weeks vs every 18 months) and ratings volume (4.1K vs 3). CO2 sensor's advantage is in-app purchases (none vs 13) and ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Hidden Camera Detector FindSpy sells 13 in-app purchases, starting at $4.99 per 7 days. CO2 sensor asks for nothing beyond the download.

Hidden Camera Detector FindSpy holds the better App Store score, 4.4 against 2.7. That said, the two scores are not equally well evidenced: Hidden Camera Detector FindSpy has 4.1K ratings behind it against 3, so its average is the more settled of the two.

CO2 sensor ships an update every 18 months, Hidden Camera Detector FindSpy every 4 weeks. The most recent releases landed on September 16, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | CO2 sensor | Hidden Camera Detector FindSpy |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.7 (3 ratings)](https://appshunter.io/ios/app/co2-sensor/id1643286074/reviews) | **[4.4 (4.1K ratings)](https://appshunter.io/ios/app/hidden-camera-detector-findspy/id6469943309/reviews)** |
| Number of ratings | 3 | **4.1K** |
| Positive reviews | — | 24.7% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 18 months | **Every 4 weeks** |
| Monetization | **Free** | Subscription |
| Size | 0 MB | 184 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 9+ |
| Developer | [sighmon](https://appshunter.io/developer/377815161) | [Kain Suite Pte. Ltd.](https://appshunter.io/developer/1761133001) |

## What reviewers say

### 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

**In-app purchases:** none


### Hidden Camera Detector FindSpy

[App page](https://appshunter.io/ios/app/hidden-camera-detector-findspy/id6469943309)

Detect hidden surveillance devices like cameras and listening tools in unfamiliar places. Protect your privacy in hotels, rentals, and public spaces using network, Bluetooth, magnetic field, and infrared scanning.

**Highlights:** Network Scan for cameras, Bluetooth Device Detection, Magnetic Field Analysis, Infrared Scanning, Privacy Protection Tool

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

**In-app purchases (13)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly $4.99 | $4.99 | per 7 days |
| Weekly Subscription | $5.99 | per 7 days |
| Weekly $6.99 | $6.99 | per 7 days |
| FindSpy Pro Weekly | $12.99 | per 7 days |
| FindSpy Pro Monthly | $12.99 | per month |
| Special Sale | $14.99 | per year |
| FindSpy Pro HalfYear | $29.99 | per 6 months |
| FindSpy Pro Annual | $39.99 | per year |
| Yearly Subscription | $49.99 | per year |
| 20 Credits | $4.99 | one-time |
| 50 Credits | $9.99 | one-time |
| 100 Credits | $12.99 | one-time |
| Lifetime | $49.99 | one-time |

**What reviewers like**

- 🚀 Efficient scanning
- 🔒 Helps detect hidden cameras
- 👍 Useful for Airbnb guests
- 👍 Works well enough

**What reviewers complain about**

- 🐛 Inconsistent readings
- 🐛 Doesn't detect known cameras
- 💰 Expensive subscription
- 💰 No free trial

**Reported bugs**

- Stuck on purchase screen
- Doesn't work as advertised
- Unreliable detection

**Requested features**

- Provide more details on detected devices
- Improve Bluetooth scanning accuracy


## Frequently asked questions

### Is CO2 sensor free?

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

### Is Hidden Camera Detector FindSpy free?

Hidden Camera Detector FindSpy is free to download, with in-app purchases available.

### Which has better reviews, CO2 sensor or Hidden Camera Detector FindSpy?

Hidden Camera Detector FindSpy is rated higher. CO2 sensor averages 2.7 out of 5 from 3 ratings, while Hidden Camera Detector FindSpy averages 4.4 from 4.1K ratings.

### Do CO2 sensor or Hidden Camera Detector FindSpy have ads?

Hidden Camera Detector FindSpy shows ads; CO2 sensor does not.

### Which is updated more often, CO2 sensor or Hidden Camera Detector FindSpy?

CO2 sensor ships an update every 18 months, and Hidden Camera Detector FindSpy every 4 weeks. Most recently, CO2 sensor was updated on September 16, 2026 and Hidden Camera Detector FindSpy on September 22, 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.*