# SpyTracker vs CO2 sensor

The clearest difference is rating: SpyTracker at 4.5 against CO2 sensor's 2.7. SpyTracker also leads on update cadence (every 3 weeks vs every 18 months) and ratings volume (808 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. SpyTracker sells 2 in-app purchases, starting at $7.99 per 7 days. CO2 sensor asks for nothing beyond the download.

SpyTracker holds the better App Store score, 4.5 against 2.7. That said, the two scores are not equally well evidenced: SpyTracker has 808 ratings behind it against 3, so its average is the more settled of the two.

SpyTracker ships an update every 3 weeks, CO2 sensor every 18 months. The most recent releases landed on September 28, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | SpyTracker | CO2 sensor |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (808 ratings)](https://appshunter.io/ios/app/spytracker-wireless-detector/id1616089649/reviews)** | [2.7 (3 ratings)](https://appshunter.io/ios/app/co2-sensor/id1643286074/reviews) |
| Number of ratings | **808** | 3 |
| Positive reviews | 19.2% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 18 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 14 MB | 0 MB |
| Requires iOS | **13.4** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [晶晶 饶](https://appshunter.io/developer/1657082876) | [sighmon](https://appshunter.io/developer/377815161) |

## What reviewers say

### SpyTracker

[App page](https://appshunter.io/ios/app/spytracker-wireless-detector/id1616089649)

Optimize your WiFi by finding the best channel and location for your router. Detect all devices connected to your network and identify nearby WiFi signals. Test your phone's ping and troubleshoot network issues for improved performance.

**Highlights:** Scan all connected devices, Best WiFi channel recommendation, Copy MAC addresses, Test phone ping, Detect nearby WiFi

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SpyPoint Premium Week | $7.99 | per 7 days |
| WiFi Assist Premium | $8.99 | per month |

**What reviewers like**

- 💯 Best tracking services
- 🚀 Accurate real-time tracking

**What reviewers complain about**

- 💰 Requires paid subscription
- 🔒 Lacks transparency
- 🤔 Questionable legitimacy
- 🙅‍♀️ Ineffective for intended purpose
- 🚫 Useless without Wi-Fi

**Reported bugs**

- Subscription issues
- Tracking failures
- Compatibility problems

**Requested features**

- Detailed device information
- Ability to identify device owners
- Improved free version functionality
- Better customer support


### 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


## Frequently asked questions

### Is SpyTracker free?

SpyTracker 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, SpyTracker or CO2 sensor?

SpyTracker is rated higher. SpyTracker averages 4.5 out of 5 from 808 ratings, while CO2 sensor averages 2.7 from 3 ratings.

### Do SpyTracker or CO2 sensor have ads?

Neither SpyTracker nor CO2 sensor shows ads.

### Which is updated more often, SpyTracker or CO2 sensor?

SpyTracker ships an update every 3 weeks, and CO2 sensor every 18 months. Most recently, SpyTracker was updated on September 28, 2026 and CO2 sensor on September 16, 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.*