# Merck Manual Professional vs Lanthier

The clearest difference is rating: Merck Manual Professional at 4.8 against Lanthier's 3.8. Merck Manual Professional also leads on in-app purchases (none vs 2) and review sentiment (92% vs 62%). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Lanthier sells 2 in-app purchases, starting at $19.49 per year. Merck Manual Professional asks for nothing beyond the download.

Merck Manual Professional holds the better App Store score, 4.8 against 3.8. That said, the two scores are not equally well evidenced: Merck Manual Professional has 1.1K ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 92% of Merck Manual Professional's written reviews are positive against 62% of Lanthier's.

Merck Manual Professional ships an update every 4 months, Lanthier every 2 months. Both last shipped on October 29, 2026.

## The numbers

| Metric | Merck Manual Professional | Lanthier |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (1.1K ratings)](https://appshunter.io/ios/app/merck-manual-professional/id331016312/reviews)** | [3.8 (5 ratings)](https://appshunter.io/ios/app/lanthier/id701664895/reviews) |
| Number of ratings | **1.1K** | 5 |
| Positive reviews | **91.6% of reviews** | 61.9% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | **Free** | Subscription |
| Size | 196 MB | 70 MB |
| Requires iOS | **13.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 17+ |
| Developer | [Merck & Co Inc](https://appshunter.io/developer/334253467) | [Les Éditions Formed inc.](https://appshunter.io/developer/442932971) |

## 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


### Lanthier

[App page](https://appshunter.io/ios/app/lanthier/id701664895)

Access up-to-date internal medicine information and guidelines quickly and efficiently. This app offers a fast search function, intuitive menus, and direct links to PubMed references. It's designed for physicians, residents, and medical students to use at the bedside.

**Highlights:** Concise bedside information, Advanced search function, Intuitive menus, Direct links to PubMed, Personal note-taking, Cross-device synchronization

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lanthier - current users | $19.49 | per year |
| Lanthier - new users | $19.49 | per year |


## Frequently asked questions

### Is Merck Manual Professional free?

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

### Is Lanthier free?

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

### Which has better reviews, Merck Manual Professional or Lanthier?

Merck Manual Professional is rated higher. Merck Manual Professional averages 4.8 out of 5 from 1.1K ratings, while Lanthier averages 3.8 from 5 ratings.

### Do Merck Manual Professional or Lanthier have ads?

Neither Merck Manual Professional nor Lanthier shows ads.

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

Merck Manual Professional ships an update every 4 months, and Lanthier every 2 months. Most recently, Merck Manual Professional was updated on October 29, 2026 and Lanthier on October 29, 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.*