# BladderSafe vs Behind the Knife

The clearest difference is iOS requirement: BladderSafe at 13.0 against Behind the Knife's 15.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

BladderSafe ships an update every 2 months, Behind the Knife every 5 weeks. The most recent releases landed on September 16, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | BladderSafe | Behind the Knife |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.0 (19 ratings)](https://appshunter.io/ios/app/behind-the-knife/id1672420049/reviews)** |
| Number of ratings | — | **19** |
| Positive reviews | — | 58.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 weeks** |
| Monetization | — | Free |
| Size | 18 MB | 168 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [The University of Michigan](https://appshunter.io/developer/380339599) | [Behind the Knife](https://appshunter.io/developer/1672420051) |

## What reviewers say

### BladderSafe

[App page](https://appshunter.io/ios/app/bladdersafe/id1600516064)

**Features:** macOS Compatibility

**In-app purchases:** none


### Behind the Knife

[App page](https://appshunter.io/ios/app/behind-the-knife/id1672420049)

This platform offers surgical education with high-yield topics and interviews with field leaders. It provides timely, relevant, and engaging content to help users succeed in their medical studies and careers.

**Highlights:** Surgical education platform, High-yield educational topics, Interviews with field leaders, Timely and relevant content, Engaging learning experience

**In-app purchases:** none


## Frequently asked questions

### Is BladderSafe free?

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

### Is Behind the Knife free?

Behind the Knife is free to download, with no in-app purchases.

### Do BladderSafe or Behind the Knife have ads?

Neither BladderSafe nor Behind the Knife shows ads.

### Which is updated more often, BladderSafe or Behind the Knife?

BladderSafe ships an update every 2 months, and Behind the Knife every 5 weeks. Most recently, BladderSafe was updated on September 16, 2026 and Behind the Knife on September 19, 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.*