# CO2 sensor vs Thermal Filter

The clearest difference is rating: Thermal Filter at 4.4 against CO2 sensor's 3.4. Thermal Filter also leads on update cadence (daily vs every 12 months) and ratings volume (85 vs 7). CO2 sensor's advantage is in-app purchases (none vs 1) and device support (4 vs 1). On price, ads and iOS requirement there is nothing between them.

Both are free to download. Thermal Filter sells 1 in-app purchase, starting at $6.99 per 7 days. CO2 sensor asks for nothing beyond the download.

Thermal Filter holds the better App Store score, 4.4 against 3.4. That said, the two scores are not equally well evidenced: Thermal Filter has 85 ratings behind it against 7, so its average is the more settled of the two.

CO2 sensor ships an update every 12 months, Thermal Filter daily. The most recent releases landed on October 24, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | CO2 sensor | Thermal Filter |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.4 (7 ratings)](https://appshunter.io/ios/app/co2-sensor/id1643286074/reviews) | **[4.4 (85 ratings)](https://appshunter.io/ios/app/thermal-filter-camera-vision/id6745603515/reviews)** |
| Number of ratings | 7 | **85** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 12 months | **Daily** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 0 MB | 57 MB |
| Requires iOS | **15.6** | 16.6 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [sighmon](https://appshunter.io/developer/377815161) | [Jason Smith](https://appshunter.io/developer/1767161875) |

## 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


### Thermal Filter

[App page](https://appshunter.io/ios/app/thermal-filter-camera-vision/id6745603515)

Transform your photos and videos with simulated thermal, infrared, and night vision effects. This creative camera tool offers a unique, futuristic twist to your content, perfect for artistic exploration and social media.

**Highlights:** Simulated thermal camera mode, Infrared-style effects, Night effects simulator, Zoom and focus functionality, Edit and retouch existing media, Creative simulator effects

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Trial | $6.99 | per 7 days |


## Frequently asked questions

### Is CO2 sensor free?

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

### Is Thermal Filter free?

Thermal Filter is free to download, with in-app purchases available.

### Which has better reviews, CO2 sensor or Thermal Filter?

Thermal Filter is rated higher. CO2 sensor averages 3.4 out of 5 from 7 ratings, while Thermal Filter averages 4.4 from 85 ratings.

### Do CO2 sensor or Thermal Filter have ads?

Neither CO2 sensor nor Thermal Filter shows ads.

### Which is updated more often, CO2 sensor or Thermal Filter?

CO2 sensor ships an update every 12 months, and Thermal Filter daily. Most recently, CO2 sensor was updated on October 24, 2026 and Thermal Filter on October 28, 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.*