# Fermentor vs Diamanten Ring

The clearest difference is in-app purchases: Diamanten Ring at none against Fermentor's 1. Diamanten Ring also leads on update cadence (every 2 weeks vs every 5 weeks) and iOS requirement (12.0 vs 15.1). On price, ads and device support there is nothing between them.

Both are free to download. Fermentor sells 1 in-app purchase, starting at $0.99 per month. Diamanten Ring asks for nothing beyond the download.

Fermentor ships an update every 5 weeks, Diamanten Ring every 2 weeks. The most recent releases landed on October 3, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Fermentor | Diamanten Ring |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 88.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 2 weeks** |
| Monetization | Paid | — |
| Size | 49 MB | 27 MB |
| Requires iOS | 15.1 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Studio Zoetekauw](https://appshunter.io/developer/1789121111) | [V.O.F. De Diamanten Ring](https://appshunter.io/developer/1538606766) |

## What reviewers say

### Fermentor

[App page](https://appshunter.io/ios/app/fermentor/id978419457)

This app helps you meticulously plan and track your fermentation projects. It provides a clear overview of upcoming tasks, allows you to add detailed notes and photos, and offers pre-made templates for various ferments. You can also save your own custom templates for future use.

**Highlights:** Track fermentation projects, Project overview and reminders, Add pictures and notes, Use pre-made templates, Create custom templates, Supports English and Dutch

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Fermentor Pro | $0.99 | per month |


### Diamanten Ring

[App page](https://appshunter.io/ios/app/diamanten-ring/id1538606584)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Fermentor free?

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

### Is Diamanten Ring free?

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

### Do Fermentor or Diamanten Ring have ads?

Neither Fermentor nor Diamanten Ring shows ads.

### Which is updated more often, Fermentor or Diamanten Ring?

Fermentor ships an update every 5 weeks, and Diamanten Ring every 2 weeks. Most recently, Fermentor was updated on October 3, 2026 and Diamanten Ring on October 12, 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.*