# USMLE Step2 vs KDIGO

The clearest difference is price: KDIGO at Free against USMLE Step2's $3.99. KDIGO also leads on update cadence (every 10 days vs every 87 months). USMLE Step2's advantage is in-app purchases (none vs 2) and iOS requirement (12.4 vs 15.1). On ads and device support there is nothing between them.

KDIGO is free to download; USMLE Step2 costs $3.99 up front. KDIGO sells 2 in-app purchases, starting at $5.99 per 7 days. USMLE Step2 asks for nothing beyond the download.

USMLE Step2 ships an update every 87 months, KDIGO every 10 days. The most recent releases landed on September 11, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | USMLE Step2 | KDIGO |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 87 months | **Every 10 days** |
| Size | 12 MB | 38 MB |
| Requires iOS | **12.4** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Tourkia CHIHI](https://appshunter.io/developer/1105976811) | [Eduardo Alexandru Apostu](https://appshunter.io/developer/1871906706) |

## What reviewers say

### USMLE Step2

[App page](https://appshunter.io/ios/app/usmle-step2-exam-prep-app/id1215005191)

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

**In-app purchases:** none


### KDIGO

[App page](https://appshunter.io/ios/app/kdigo-asistente-de-chat/id6758273227)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| KDIGO Premium Semanal | $5.99 | per 7 days |
| KDIGO Premium Mensual | $22.99 | per month |


## Frequently asked questions

### Is USMLE Step2 free?

USMLE Step2 costs $3.99, with no in-app purchases.

### Is KDIGO free?

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

### Do USMLE Step2 or KDIGO have ads?

Neither USMLE Step2 nor KDIGO shows ads.

### Which is updated more often, USMLE Step2 or KDIGO?

USMLE Step2 ships an update every 87 months, and KDIGO every 10 days. Most recently, USMLE Step2 was updated on September 11, 2026 and KDIGO on September 23, 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.*