# Rash vs SURF

The clearest difference is price: SURF at Free against Rash's $9.99. Rash's advantage is in-app purchases (none vs 1) and review sentiment (88% vs 67%). On update cadence, ads and device support there is nothing between them.

SURF is free to download; Rash costs $9.99 up front. SURF sells 1 in-app purchase, starting at $99.99 per year. Rash asks for nothing beyond the download.

Rash ships an update every 7 months, SURF every 5 months. Both last shipped on September 22, 2026.

## The numbers

| Metric | Rash | SURF |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/rash/id669851114/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | **87.5% of reviews** | 66.7% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 5 months** |
| Monetization | **Paid** | Subscription |
| Size | 172 MB | 204 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [Bruno Girodias](https://appshunter.io/developer/669851117) | [Philippe FURGER](https://appshunter.io/developer/1055742280) |

## What reviewers say

### Rash

[App page](https://appshunter.io/ios/app/rash/id669851114)

An educational tool and memory aid for identifying and understanding common childhood eruptive diseases. It offers essential information on care, treatment, and prevention, complemented by visual aids.

**Highlights:** Childhood disease identification, Care and treatment information, Preventive measures, Photos and illustrations, Memory aid sheets, Multilingual support (English, French, Spanish)

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

**In-app purchases:** none


### SURF

[App page](https://appshunter.io/ios/app/surf/id1055743301)

Access evidence-based medical content for internal medicine, differential diagnosis, and lab values. This comprehensive guide is designed for residents, general practitioners, and specialists, offering a vast amount of information from multiple expert-authored books.

**Highlights:** Evidence-based medical content, Differential diagnosis of symptoms, Lab value interpretation, Comprehensive internal medicine, Links to external calculators, Accessible on multiple devices

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 year | $99.99 | per year |


## Frequently asked questions

### Is Rash free?

Rash costs $9.99, with no in-app purchases.

### Is SURF free?

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

### Do Rash or SURF have ads?

Neither Rash nor SURF shows ads.

### Which is updated more often, Rash or SURF?

Rash ships an update every 7 months, and SURF every 5 months. Most recently, Rash was updated on September 22, 2026 and SURF on September 22, 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.*