# Cair vs SoilDoc

The clearest difference is price: SoilDoc at Free against Cair's $0.99. SoilDoc also leads on update cadence (every 8 months vs every 37 months) and iOS requirement (13 vs 16.6). On ads, in-app purchases and device support there is nothing between them.

SoilDoc is free to download; Cair costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Cair ships an update every 37 months, SoilDoc every 8 months. The most recent releases landed on October 5, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Cair | SoilDoc |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 37 months | **Every 8 months** |
| Size | 3 MB | 131 MB |
| Requires iOS | 16.6 | **13** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [dgApps](https://appshunter.io/developer/357488432) | [Forschungsinstitut fur biologischen Landbau FiBL](https://appshunter.io/developer/1386461790) |

## What reviewers say

### Cair

[App page](https://appshunter.io/ios/app/cair/id1197989847)

**In-app purchases:** none


### SoilDoc

[App page](https://appshunter.io/ios/app/soildoc/id1454927145)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Cair free?

Cair costs $0.99, with no in-app purchases.

### Is SoilDoc free?

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

### Do Cair or SoilDoc have ads?

Neither Cair nor SoilDoc shows ads.

### Which is updated more often, Cair or SoilDoc?

Cair ships an update every 37 months, and SoilDoc every 8 months. Most recently, Cair was updated on October 5, 2026 and SoilDoc on September 18, 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.*