# REDCap Mobile App vs Behind the Knife

The clearest difference is rating: REDCap Mobile App at 4.5 against Behind the Knife's 4.0. REDCap Mobile App also leads on iOS requirement (11.0 vs 15.0). Behind the Knife's advantage is review sentiment (58% vs 25%) and ratings volume (19 vs 4). 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.

REDCap Mobile App holds the better App Store score, 4.5 against 4.0. Both are backed by a comparable volume of ratings — 4 and 19 respectively. Written reviews complicate that: 25% of REDCap Mobile App's written reviews are positive against 58% of Behind the Knife's, so the app with the better star average is not the one people write more warmly about.

REDCap Mobile App ships an update every 3 weeks, Behind the Knife every 5 weeks. The most recent releases landed on September 23, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | REDCap Mobile App | Behind the Knife |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (4 ratings)](https://appshunter.io/ios/app/redcap-mobile-app/id972760478/reviews)** | [4.0 (19 ratings)](https://appshunter.io/ios/app/behind-the-knife/id1672420049/reviews) |
| Number of ratings | 4 | **19** |
| Positive reviews | 25.0% of reviews | **58.3% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 5 weeks |
| Monetization | Free | Free |
| Size | 26 MB | 168 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Vanderbilt University Medical Center](https://appshunter.io/developer/1114939673) | [Behind the Knife](https://appshunter.io/developer/1672420051) |

## What reviewers say

### REDCap Mobile App

[App page](https://appshunter.io/ios/app/redcap-mobile-app/id972760478)

Collect data offline for your REDCap projects. Download your project securely, gather information on your device, and sync it back to the server. Supports text, photos, videos, signatures, and audio.

**Highlights:** Offline data collection, Secure project download, Multi-user interface, Support for photos, videos, audio, and signatures, Activity logging for audit purposes, Participant data entry restriction

**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 REDCap Mobile App free?

REDCap Mobile App 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.

### Which has better reviews, REDCap Mobile App or Behind the Knife?

REDCap Mobile App is rated higher. REDCap Mobile App averages 4.5 out of 5 from 4 ratings, while Behind the Knife averages 4.0 from 19 ratings.

### Do REDCap Mobile App or Behind the Knife have ads?

Neither REDCap Mobile App nor Behind the Knife shows ads.

### Which is updated more often, REDCap Mobile App or Behind the Knife?

REDCap Mobile App ships an update every 3 weeks, and Behind the Knife every 5 weeks. Most recently, REDCap Mobile App was updated on September 23, 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.*