# Detector CO2 vs #1 Hidden Camera Detector

The clearest difference is rating: #1 Hidden Camera Detector at 4.2 against Detector CO2's 2.0. #1 Hidden Camera Detector also leads on ratings volume (3.7K vs 1). Detector CO2's advantage is in-app purchases (none vs 4) and iOS requirement (10.0 vs 14.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. #1 Hidden Camera Detector sells 4 in-app purchases, starting at $4.99 per 7 days. Detector CO2 asks for nothing beyond the download.

#1 Hidden Camera Detector holds the better App Store score, 4.2 against 2.0. That said, the two scores are not equally well evidenced: #1 Hidden Camera Detector has 3.7K ratings behind it against 1, so its average is the more settled of the two.

Detector CO2 ships an update every 3 weeks, #1 Hidden Camera Detector fortnightly. Both last shipped on November 3, 2026.

## The numbers

| Metric | Detector CO2 | #1 Hidden Camera Detector |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.0 (1 ratings)](https://appshunter.io/ios/app/detector-co2/id1561126616/reviews) | **[4.2 (3.7K ratings)](https://appshunter.io/ios/app/1-hidden-camera-detector/id1665597557/reviews)** |
| Number of ratings | 1 | **3.7K** |
| Positive reviews | — | 59.8% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Fortnightly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 9 MB | 20 MB |
| Requires iOS | **10.0** | 14.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Geotap Games S.L.](https://appshunter.io/developer/596729068) | [Gibco LTD](https://appshunter.io/developer/1649363079) |

## What reviewers say

### Detector CO2

[App page](https://appshunter.io/ios/app/detector-co2/id1561126616)

Measure ambient CO2 levels using a compatible device. This utility app provides environmental data for your surroundings.

**Highlights:** Measure CO2 levels, Utilizes device capabilities, Environmental data display

**Features:** macOS Compatibility

**In-app purchases:** none


### #1 Hidden Camera Detector

[App page](https://appshunter.io/ios/app/1-hidden-camera-detector/id1665597557)

Detect hidden cameras and microphones using your device's magnetic field sensor. This app helps secure your privacy in various locations by identifying electromagnetic fields emitted by electronic devices.

**Highlights:** Detects hidden cameras, Finds hidden microphones, Uses magnetic field sensor, Radiation detector, IR camera finder, Scans metal objects

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Hidden Camera Detector Access | $4.99 | per 7 days |
| Hidden Camera Detector Access | $6.99 | per 7 days |
| Spy Detector Monthly Access | $12.99 | per month |
| Spy Detector Yearly Access | $39.99 | per year |

**What reviewers like**

- 🚀 Easy to use
- 🔒 Effective at detecting hidden cameras
- 👍 User-friendly interface
- 🚀 Quick and accurate detection
- 🔒 Provides peace of mind for travelers

**What reviewers complain about**

- 🐛 Some false positives reported
- 🔋 Can drain battery quickly
- 💰 Subscription-based model with high weekly cost

**Reported bugs**

- Scan progress bar not moving
- Inability to complete scans
- Compatibility issues with older devices

**Requested features**

- More detailed explanations about detection technology
- Additional customization options
- Ability to locate and identify detected devices


## Frequently asked questions

### Is Detector CO2 free?

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

### Is #1 Hidden Camera Detector free?

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

### Which has better reviews, Detector CO2 or #1 Hidden Camera Detector?

#1 Hidden Camera Detector is rated higher. Detector CO2 averages 2.0 out of 5 from 1 ratings, while #1 Hidden Camera Detector averages 4.2 from 3.7K ratings.

### Do Detector CO2 or #1 Hidden Camera Detector have ads?

Neither Detector CO2 nor #1 Hidden Camera Detector shows ads.

### Which is updated more often, Detector CO2 or #1 Hidden Camera Detector?

Detector CO2 ships an update every 3 weeks, and #1 Hidden Camera Detector fortnightly. Most recently, Detector CO2 was updated on November 3, 2026 and #1 Hidden Camera Detector on November 3, 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.*