# CO2 sensor vs Find Hidden

The clearest difference is rating: Find Hidden at 4.4 against CO2 sensor's 2.7. Find Hidden also leads on update cadence (monthly vs every 18 months) and ratings volume (341 vs 3). CO2 sensor's advantage is in-app purchases (none vs 2) and device support (4 vs 2). On price and ads there is nothing between them.

Both are free to download. Find Hidden sells 2 in-app purchases, starting at $9.99 per month. CO2 sensor asks for nothing beyond the download.

Find Hidden holds the better App Store score, 4.4 against 2.7. That said, the two scores are not equally well evidenced: Find Hidden has 341 ratings behind it against 3, so its average is the more settled of the two.

CO2 sensor ships an update every 18 months, Find Hidden monthly. The most recent releases landed on September 16, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | CO2 sensor | Find Hidden |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.7 (3 ratings)](https://appshunter.io/ios/app/co2-sensor/id1643286074/reviews) | **[4.4 (341 ratings)](https://appshunter.io/ios/app/find-hidden-wireless-detector/id6443483566/reviews)** |
| Number of ratings | 3 | **341** |
| Positive reviews | — | 26.1% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 18 months | **Monthly** |
| Monetization | **Free** | Subscription |
| Size | 0 MB | 21 MB |
| Requires iOS | 15.6 | **13.4** |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [sighmon](https://appshunter.io/developer/377815161) | [安帮 潘](https://appshunter.io/developer/1620855567) |

## 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


### Find Hidden

[App page](https://appshunter.io/ios/app/find-hidden-wireless-detector/id6443483566)

This app helps you detect suspicious electronic devices on your network. It scans your environment in real-time to identify connected devices, distinguishing between safe and potentially hidden ones. Protect your privacy in new locations or while traveling.

**Highlights:** Detect suspicious peripherals, Inspect spy device information, Scan all connected electronic devices, Real-time network updates, Distinguish safe and suspicious devices, Anti sneak shot guide

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Hidden Inspector Pro Month | $9.99 | per month |
| Find Hidden Premium Year | $14.99 | per year |

**What reviewers like**

- 👍 Works well (for some)
- 👍 "Son cool it really wrks yall"

**What reviewers complain about**

- 😞 Doesn't work
- 😞 Doesn't show suspicious devices
- 😞 Closes when clicking ping details
- 😞 No ping shown
- 😞 Scans Bluetooth only

**Reported bugs**

- App closes when clicking ping details
- Inaccurate device counts (fluctuates)
- Doesn't show location
- Shows only IP numbers

**Requested features**

- Precise location of the object
- Application in Spanish
- Clearer defined mapping
- Free for those with stalkers
- Check for wireless IPs (free alternative)


## Frequently asked questions

### Is CO2 sensor free?

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

### Is Find Hidden free?

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

### Which has better reviews, CO2 sensor or Find Hidden?

Find Hidden is rated higher. CO2 sensor averages 2.7 out of 5 from 3 ratings, while Find Hidden averages 4.4 from 341 ratings.

### Do CO2 sensor or Find Hidden have ads?

Neither CO2 sensor nor Find Hidden shows ads.

### Which is updated more often, CO2 sensor or Find Hidden?

CO2 sensor ships an update every 18 months, and Find Hidden monthly. Most recently, CO2 sensor was updated on September 16, 2026 and Find Hidden on September 25, 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.*