# KidneyOS vs FORM Training

The clearest difference is update cadence: KidneyOS at every 2 days against FORM Training's weekly. 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 FORM Training sells 3 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.

KidneyOS ships an update every 2 days, FORM Training weekly. Both last shipped on September 21, 2026.

## The numbers

| Metric | KidneyOS | FORM Training |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 2 days** | Weekly |
| Size | 8 MB | 124 MB |
| Requires iOS | **17.6** | 18.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Btown Labs, LLC](https://appshunter.io/developer/1891891795) | [Everett Thomas](https://appshunter.io/developer/6774342883) |

## 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 |


### FORM Training

[App page](https://appshunter.io/ios/app/form-training/id6774342881)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $4.99 | per 7 days |
| Monthly | $9.99 | per month |
| Annual | $29.99 | per year |


## Frequently asked questions

### Is KidneyOS free?

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

### Is FORM Training free?

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

### Do KidneyOS or FORM Training have ads?

Neither KidneyOS nor FORM Training shows ads.

### Which is updated more often, KidneyOS or FORM Training?

KidneyOS ships an update every 2 days, and FORM Training weekly. Most recently, KidneyOS was updated on September 21, 2026 and FORM Training on September 21, 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.*