# SoilDoc vs Comet4

The clearest difference is iOS requirement: SoilDoc at 13 against Comet4's 16.6. 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.

SoilDoc ships an update every 8 months, Comet4 every 6 months. The most recent releases landed on September 18, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | SoilDoc | Comet4 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 6 months** |
| Size | 131 MB | 33 MB |
| Requires iOS | **13** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Forschungsinstitut fur biologischen Landbau FiBL](https://appshunter.io/developer/1386461790) | [Andres Mena Tobar](https://appshunter.io/developer/1487763227) |

## What reviewers say

### SoilDoc

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Comet4

[App page](https://appshunter.io/ios/app/comet4/id1487763228)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SoilDoc free?

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

### Is Comet4 free?

Comet4 is free to download, with no in-app purchases.

### Do SoilDoc or Comet4 have ads?

Neither SoilDoc nor Comet4 shows ads.

### Which is updated more often, SoilDoc or Comet4?

SoilDoc ships an update every 8 months, and Comet4 every 6 months. Most recently, SoilDoc was updated on September 18, 2026 and Comet4 on September 30, 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.*