# CO2 sensor vs EV

The clearest difference is update cadence: EV at weekly against CO2 sensor's every 18 months. CO2 sensor's advantage is device support (4 vs 2) and iOS requirement (15.6 vs 18.1). On price, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

CO2 sensor ships an update every 18 months, EV weekly. The most recent releases landed on September 16, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | CO2 sensor | EV |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.7 (3 ratings)](https://appshunter.io/ios/app/co2-sensor/id1643286074/reviews)** | — |
| Number of ratings | **3** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 18 months | **Weekly** |
| Monetization | Free | — |
| Size | 0 MB | 4 MB |
| Requires iOS | **15.6** | 18.1 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [sighmon](https://appshunter.io/developer/377815161) | [Guy MacDonald](https://appshunter.io/developer/1666058008) |

## 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


### EV

[App page](https://appshunter.io/ios/app/ev-ezir/id6751869076)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CO2 sensor free?

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

### Is EV free?

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

### Do CO2 sensor or EV have ads?

Neither CO2 sensor nor EV shows ads.

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

CO2 sensor ships an update every 18 months, and EV weekly. Most recently, CO2 sensor was updated on September 16, 2026 and EV on September 10, 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.*