# KISPI Wiki vs SURF

The clearest difference is in-app purchases: KISPI Wiki at none against SURF's 1. KISPI Wiki also leads on iOS requirement (12.0 vs 16.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. SURF sells 1 in-app purchase, starting at $99.99 per year. KISPI Wiki asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 5 months. The most recent releases landed on September 19, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | KISPI Wiki | SURF |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 66.7% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | Every 5 months |
| Monetization | — | Subscription |
| Size | 9 MB | 204 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 17+ | 17+ |
| Developer | [Luzerner Kantonsspital](https://appshunter.io/developer/1243994671) | [Philippe FURGER](https://appshunter.io/developer/1055742280) |

## What reviewers say

### KISPI Wiki

[App page](https://appshunter.io/ios/app/kispi-wiki/id605276892)

**Features:** macOS Compatibility

**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 KISPI Wiki free?

KISPI Wiki is free to download, with no in-app purchases.

### Is SURF free?

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

### Do KISPI Wiki or SURF have ads?

Neither KISPI Wiki nor SURF shows ads.

### Which is updated more often, KISPI Wiki or SURF?

KISPI Wiki ships an update every 5 months, and SURF every 5 months. Most recently, KISPI Wiki was updated on September 19, 2026 and SURF on October 9, 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.*