# Merck Manual Professional vs DocCheck Flexikon

The clearest difference is rating: Merck Manual Professional at 4.8 against DocCheck Flexikon's 4.3. Merck Manual Professional also leads on ratings volume (1.1K vs 9) and iOS requirement (13.0 vs 15.0). DocCheck Flexikon's advantage is update cadence (every 6 weeks vs every 4 months). On price, review sentiment, 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.

Merck Manual Professional holds the better App Store score, 4.8 against 4.3. That said, the two scores are not equally well evidenced: Merck Manual Professional has 1.1K ratings behind it against 9, so its average is the more settled of the two. Written reviews complicate that: 92% of Merck Manual Professional's written reviews are positive against 95% of DocCheck Flexikon's, so the app with the better star average is not the one people write more warmly about.

Merck Manual Professional ships an update every 4 months, DocCheck Flexikon every 6 weeks. The most recent releases landed on November 10, 2026 and November 11, 2026 respectively.

## The numbers

| Metric | Merck Manual Professional | DocCheck Flexikon |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (1.1K ratings)](https://appshunter.io/ios/app/merck-manual-professional/id331016312/reviews)** | [4.3 (9 ratings)](https://appshunter.io/ios/app/doccheck-flexikon/id1029519711/reviews) |
| Number of ratings | **1.1K** | 9 |
| Positive reviews | 91.7% of reviews | **94.5% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 6 weeks** |
| Monetization | Free | Free |
| Size | 196 MB | 39 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [Merck & Co Inc](https://appshunter.io/developer/334253467) | [DocCheck AG](https://appshunter.io/developer/1785591806) |

## What reviewers say

### Merck Manual Professional

[App page](https://appshunter.io/ios/app/merck-manual-professional/id331016312)

This medical reference app offers healthcare practitioners and students clear, practical explanations for thousands of conditions across major medical and surgical specialties. It includes photos, illustrations, instructional videos, drug information, quizzes, and case simulations to stay updated with the latest clinical information.

**Highlights:** Thousands of medical topics, Photos and illustrations, Instructional 'How to' videos, Drug reference information, Knowledge quizzes, Interactive case simulations

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- 💯 Excellent medical resource
- 🔍 Comprehensive and up-to-date information
- 🎓 Valuable for medical professionals and students
- 🔍 Reliable and trusted source
- 🖥️ Great offline accessibility

**What reviewers complain about**

- 🐛 App crashes and freezes
- 🔍 Lack of search functionality
- 🔍 Outdated or missing content
- 🔍 Difficult navigation and organization

**Reported bugs**

- App crashes when searching for certain conditions
- Images and videos not loading properly
- Offline mode not working as expected

**Requested features**

- Add personalization features like notes, highlights, and flashcards
- Improve search functionality and relevance
- Provide more frequent content updates
- Enhance app stability and performance


### DocCheck Flexikon

[App page](https://appshunter.io/ios/app/doccheck-flexikon/id1029519711)

Access a vast library of medical information, including definitions, symptoms, and therapies, through an extensive lexicon and encyclopedia. This app offers quick searches, offline access to over 80,000 articles, and comprehensive visualizations with 3D models and videos.

**Highlights:** Extensive medical lexicon and encyclopedia, Search definitions, symptoms, and therapies, Over 80,000 articles, images, and videos, Offline access to favorites, Regular content updates with peer review, 3D models, videos, and galleries for visualization

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

**In-app purchases:** none


## Frequently asked questions

### Is Merck Manual Professional free?

Merck Manual Professional is free to download, with no in-app purchases.

### Is DocCheck Flexikon free?

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

### Which has better reviews, Merck Manual Professional or DocCheck Flexikon?

Merck Manual Professional is rated higher. Merck Manual Professional averages 4.8 out of 5 from 1.1K ratings, while DocCheck Flexikon averages 4.3 from 9 ratings.

### Do Merck Manual Professional or DocCheck Flexikon have ads?

Neither Merck Manual Professional nor DocCheck Flexikon shows ads.

### Which is updated more often, Merck Manual Professional or DocCheck Flexikon?

Merck Manual Professional ships an update every 4 months, and DocCheck Flexikon every 6 weeks. Most recently, Merck Manual Professional was updated on November 10, 2026 and DocCheck Flexikon on November 11, 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.*