# FieldKit.org vs CO2IN

The clearest difference is iOS requirement: FieldKit.org at 13.0 against CO2IN's 15.0. On price, update cadence, 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.

FieldKit.org ships an update every 4 months, CO2IN every 2 months. The most recent releases landed on October 3, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | FieldKit.org | CO2IN |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/fieldkitorg/id1463631293/reviews)** | — |
| Number of ratings | **4** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | Free | — |
| Size | 86 MB | 73 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Conservify](https://appshunter.io/developer/1463631292) | [The CO2IN, a.s.](https://appshunter.io/developer/1580951797) |

## What reviewers say

### FieldKit.org

[App page](https://appshunter.io/ios/app/fieldkitorg/id1463631293)

This app provides low-cost hardware and a mobile platform for environmental sensing, data management, and community engagement. It allows users to monitor and advocate for their surroundings by collecting, analyzing, and sharing environmental data.

**Highlights:** Easy-to-use environmental sensors, Data management and analysis platform, Real-time sensor data visualization, Customizable data collection schedules, Data download in multiple formats, Community engagement and discussions

**In-app purchases:** none


### CO2IN

[App page](https://appshunter.io/ios/app/co2in/id1513533437)

**In-app purchases:** none


## Frequently asked questions

### Is FieldKit.org free?

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

### Is CO2IN free?

CO2IN is free to download, with no in-app purchases.

### Do FieldKit.org or CO2IN have ads?

Neither FieldKit.org nor CO2IN shows ads.

### Which is updated more often, FieldKit.org or CO2IN?

FieldKit.org ships an update every 4 months, and CO2IN every 2 months. Most recently, FieldKit.org was updated on October 3, 2026 and CO2IN on October 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.*