# Arthro Diagnostics vs Martha

The clearest difference is in-app purchases: Arthro Diagnostics at none against Martha's 2. Martha's advantage is update cadence (every 2 weeks vs every 4 months) and iOS requirement (16.4 vs 18.6). On price, ads and device support there is nothing between them.

Both are free to download. Martha sells 2 in-app purchases, starting at $24.99 per month. Arthro Diagnostics asks for nothing beyond the download.

Arthro Diagnostics ships an update every 4 months, Martha every 2 weeks. The most recent releases landed on November 9, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Arthro Diagnostics | Martha |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/martha-vascular-access-cns/id6807851723/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 weeks** |
| Monetization | — | Freemium |
| Size | 1 MB | 45 MB |
| Requires iOS | 18.6 | **16.4** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 17+ | 12+ |
| Developer | [Redpill Linpro AB](https://appshunter.io/developer/1877091292) | [VASCULAR ACCESS & CONSULTING LLC](https://appshunter.io/developer/6775916160) |

## What reviewers say

### Arthro Diagnostics

[App page](https://appshunter.io/ios/app/arthro-diagnostics/id6759158209)

**Features:** macOS Compatibility

**In-app purchases:** none


### Martha

[App page](https://appshunter.io/ios/app/martha-vascular-access-cns/id6807851723)

Get instant, cited answers to common vascular access questions from a virtual clinical nurse specialist. This app provides practical guidance on device selection, medication compatibility, and best practices, grounded in current standards and literature. It's designed for nurses working independently, offering clear, actionable advice.

**Highlights:** Ask vascular access questions, Cited answers from standards, Device selection guidance, Medication compatibility info, Occlusion and resistance troubleshooting, CLABSI prevention advice, Scope-of-practice clarification

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $24.99 | per month |
| Annual | $199.99 | per year |


## Frequently asked questions

### Is Arthro Diagnostics free?

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

### Is Martha free?

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

### Do Arthro Diagnostics or Martha have ads?

Neither Arthro Diagnostics nor Martha shows ads.

### Which is updated more often, Arthro Diagnostics or Martha?

Arthro Diagnostics ships an update every 4 months, and Martha every 2 weeks. Most recently, Arthro Diagnostics was updated on November 9, 2026 and Martha on November 6, 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.*