# Fermentor vs AB Compatibility

The clearest difference is in-app purchases: AB Compatibility at none against Fermentor's 1. On price, update cadence, 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. AB Compatibility asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 5 weeks. The most recent releases landed on October 3, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Fermentor | AB Compatibility |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 88.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 weeks | Every 5 weeks |
| Monetization | Paid | — |
| Size | 49 MB | 42 MB |
| Requires iOS | **15.1** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, Apple Watch |
| Age rating | 17+ | 4+ |
| Developer | [Studio Zoetekauw](https://appshunter.io/developer/1789121111) | [Alexander Berkovich](https://appshunter.io/developer/1460157188) |

## 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 |


### AB Compatibility

[App page](https://appshunter.io/ios/app/ab-compatibility/id1642034607)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Fermentor free?

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

### Is AB Compatibility free?

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

### Do Fermentor or AB Compatibility have ads?

Neither Fermentor nor AB Compatibility shows ads.

### Which is updated more often, Fermentor or AB Compatibility?

Fermentor ships an update every 5 weeks, and AB Compatibility every 5 weeks. Most recently, Fermentor was updated on October 3, 2026 and AB Compatibility on October 6, 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.*