# Kombucha Keeper vs FermentLog

The clearest difference is in-app purchases: Kombucha Keeper at none against FermentLog's 5. Kombucha Keeper also leads on iOS requirement (15.1 vs 17.0). FermentLog's advantage is update cadence (every 3 weeks vs every 2 months). On price, ads and device support there is nothing between them.

Both are free to download. FermentLog sells 5 in-app purchases, starting at $9.99 per year. Kombucha Keeper asks for nothing beyond the download.

Kombucha Keeper ships an update every 2 months, FermentLog every 3 weeks. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Kombucha Keeper | FermentLog |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Size | 23 MB | 3 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [Wesley Dudok van Heel](https://appshunter.io/developer/1726921748) | [PETRO VAKULENKO](https://appshunter.io/developer/6795234946) |

## What reviewers say

### Kombucha Keeper

[App page](https://appshunter.io/ios/app/kombucha-keeper/id6746731068)

**In-app purchases:** none


### FermentLog

[App page](https://appshunter.io/ios/app/fermentlog-fermentation-log/id6808309840)

**Features:** Vision Pro support

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| FermentLog Pro Yearly | $9.99 | per year |
| Small Support Tip | $2.99 | one-time |
| Medium Support Tip | $4.99 | one-time |
| Large Support Tip | $9.99 | one-time |
| FermentLog Pro Lifetime | $16.99 | one-time |


## Frequently asked questions

### Is Kombucha Keeper free?

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

### Is FermentLog free?

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

### Do Kombucha Keeper or FermentLog have ads?

Neither Kombucha Keeper nor FermentLog shows ads.

### Which is updated more often, Kombucha Keeper or FermentLog?

Kombucha Keeper ships an update every 2 months, and FermentLog every 3 weeks. Most recently, Kombucha Keeper was updated on October 30, 2026 and FermentLog on October 31, 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.*