# KidneyOS vs Blood Test Tracker

The clearest difference is update cadence: KidneyOS at every 2 days against Blood Test Tracker's every 2 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. KidneyOS sells 3 in-app purchases, starting at $2.99 per month and Blood Test Tracker sells 3 in-app purchases, starting at $5.99 per 7 days. Whichever you choose, the download price is not the number that matters.

KidneyOS ships an update every 2 days, Blood Test Tracker every 2 months. Both last shipped on October 25, 2026.

## The numbers

| Metric | KidneyOS | Blood Test Tracker |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 2 months |
| Size | 8 MB | 3 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Btown Labs, LLC](https://appshunter.io/developer/1891891795) | [LEAN ASIA CO., LTD](https://appshunter.io/developer/1815050814) |

## What reviewers say

### KidneyOS

[App page](https://appshunter.io/ios/app/kidneyos/id6767735794)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| KidneyOS Plus Monthly | $2.99 | per month |
| KidneyOS Plus Annual | $19.99 | per year |
| KidneyOS Plus Lifetime | $49.99 | one-time |


### Blood Test Tracker

[App page](https://appshunter.io/ios/app/blood-test-tracker-lab-log/id6772258766)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Glucose Trends Weekly | $5.99 | per 7 days |
| Thyroid & TSH Yearly | $29.99 | per year |
| Cholesterol Lifetime | $59.99 | one-time |


## Frequently asked questions

### Is KidneyOS free?

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

### Is Blood Test Tracker free?

Blood Test Tracker is free to download, with in-app purchases available.

### Do KidneyOS or Blood Test Tracker have ads?

Neither KidneyOS nor Blood Test Tracker shows ads.

### Which is updated more often, KidneyOS or Blood Test Tracker?

KidneyOS ships an update every 2 days, and Blood Test Tracker every 2 months. Most recently, KidneyOS was updated on October 25, 2026 and Blood Test Tracker on October 25, 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.*