# Breath Diary vs Kidneybook

The clearest difference is update cadence: Kidneybook at every 2 weeks against Breath Diary's monthly. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Breath Diary ships an update monthly, Kidneybook every 2 weeks. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Breath Diary | Kidneybook |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 2 weeks** |
| Size | 56 MB | 12 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 17+ | 12+ |
| Developer | [yuuki iwamoto](https://appshunter.io/developer/1039662444) | [RAINBOW TREE LLC](https://appshunter.io/developer/1619997282) |

## What reviewers say

### Breath Diary

[App page](https://appshunter.io/ios/app/breath-diary/id6744024531)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Kidneybook

[App page](https://appshunter.io/ios/app/kidneybook-ckd-lab-tracker/id6794885236)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Breath Diary free?

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

### Is Kidneybook free?

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

### Do Breath Diary or Kidneybook have ads?

Neither Breath Diary nor Kidneybook shows ads.

### Which is updated more often, Breath Diary or Kidneybook?

Breath Diary ships an update monthly, and Kidneybook every 2 weeks. Most recently, Breath Diary was updated on October 30, 2026 and Kidneybook 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.*