# CO2 sensor vs Hidden & Spy Camera Detector

The clearest difference is in-app purchases: CO2 sensor at none against Hidden & Spy Camera Detector's 8. CO2 sensor also leads on ads (none vs shown) and device support (4 vs 2). Hidden & Spy Camera Detector's advantage is rating (3.9 vs 3.4) and ratings volume (835 vs 7). On price, update cadence and iOS requirement there is nothing between them.

Both are free to download. Hidden & Spy Camera Detector sells 8 in-app purchases, starting at $2.99 per 7 days. CO2 sensor asks for nothing beyond the download.

Hidden & Spy Camera Detector holds the better App Store score, 3.9 against 3.4. That said, the two scores are not equally well evidenced: Hidden & Spy Camera Detector has 835 ratings behind it against 7, so its average is the more settled of the two.

CO2 sensor ships an update every 12 months, Hidden & Spy Camera Detector every 8 months. The most recent releases landed on October 24, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | CO2 sensor | Hidden & Spy Camera Detector |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.4 (7 ratings)](https://appshunter.io/ios/app/co2-sensor/id1643286074/reviews) | **[3.9 (835 ratings)](https://appshunter.io/ios/app/hidden-and-spy-camera-detector/id6444044162/reviews)** |
| Number of ratings | 7 | **835** |
| Positive reviews | — | 30.9% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 12 months | **Every 8 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 0 MB | 141 MB |
| Requires iOS | 15.6 | **14.0** |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [sighmon](https://appshunter.io/developer/377815161) | [Apps Labs](https://appshunter.io/developer/1648354195) |

## 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

**Features:** Vision Pro support

**In-app purchases:** none


### Hidden & Spy Camera Detector

[App page](https://appshunter.io/ios/app/hidden-and-spy-camera-detector/id6444044162)

Protect your privacy by scanning your surroundings for hidden spy cameras. This app offers multiple detection methods, including Wi-Fi scanning and infrared detection, to help you identify suspicious devices in any location.

**Highlights:** Wi-Fi scanner for suspicious devices, Red dot detection via phone lens, Scans hotel rooms, bathrooms, and changing rooms, Protects user privacy, Easy-to-use interface

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

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Camera Detector | $2.99 | per 7 days |
| Camera Detector | $6.99 | per month |
| Hidden Camera Detector | $6.99 | per month |
| Spy Camera Detector | $6.99 | per 7 days |
| Hidden Camera | $19.99 | per year |
| Spy Camera | $39.99 | per year |
| Hidden Camera | $39.99 | per year |
| Camera Detect | $49.99 | one-time |

**What reviewers like**

- ⭐ Excepcional
- 🔍 Effective camera detection
- 👍 Simple and easy to use
- 🕵️‍♀️ Provides peace of mind when traveling

**What reviewers complain about**

- 🚫 Doesn't work as advertised
- 🔒 Hard to cancel subscription
- 💰 Unauthorized charges
- 🤖 Inaccurate AI/lens detection

**Reported bugs**

- App crashes or shuts down during use
- Doesn't detect known hidden cameras

**Requested features**

- Clearer instructions on how to use the app
- Ability to easily cancel subscription
- More reliable camera detection capabilities


## Frequently asked questions

### Is CO2 sensor free?

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

### Is Hidden & Spy Camera Detector free?

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

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

Hidden & Spy Camera Detector is rated higher. CO2 sensor averages 3.4 out of 5 from 7 ratings, while Hidden & Spy Camera Detector averages 3.9 from 835 ratings.

### Do CO2 sensor or Hidden & Spy Camera Detector have ads?

Hidden & Spy Camera Detector shows ads; CO2 sensor does not.

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

CO2 sensor ships an update every 12 months, and Hidden & Spy Camera Detector every 8 months. Most recently, CO2 sensor was updated on October 24, 2026 and Hidden & Spy Camera Detector on October 30, 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.*