Comparison

Merck Manual Consumer vs Relief Central

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Merck Manual Consumer

Access comprehensive medical information in everyday language. This app provides clear explanations of thousands of medical disorders, symptoms, diagnoses, and treatments, along with expert insights and multimedia resources.

Highlights
  • Expert-written health information
  • Everyday language explanations
  • Symptom, diagnosis, and treatment search
  • Photos and illustrations
  • Animations of diseases and treatments
  • Drug and medicine information
Features
Read full description

SPECIAL NOTE ABOUT DOWNLOAD *** Downloading this app is a 2-step process: the first step is a download of the app template, and the second step is a full download of app content. Please do not navigate away from the app until both steps have been completed. *** Developed especially for patients, caregivers, and families, this version of the Merck Manual medical information app is created just for you. Now with many new features and enhancements, the Merck Manual Consumer app is written in everyday language. This Consumer Version provides clear, practical explanations for thousands of medical disorders, including symptoms and what doctors do to diagnose and treat medical conditions. The trusted Merck Manual Consumer medical information app for on-the-go reference offers: • Health and medical information written and updated regularly by more than 350 medical experts • Topics searchable by symptom, diagnosis or treatment, all written in easy-to-understand language • Photos and Illustrations on thousands of disorders and diseases • Animations that visually demonstrate diseases and treatments • Interactive Quizzes* to test knowledge on health topics--scores can be posted on Twitter • Drug and Medicine Information • Medical News and Commentary* covering the most current and important health topics • Editorials* written by top medical experts • Self-assessments* to check your health and fitness levels • Medical Podcasts* debunking medical myths from acclaimed doctors across the country *Internet access needed. About Merck Manuals Our mission is simple: We believe that health information is a universal right and that every person is entitled to accurate, accessible and usable medical information. We have a responsibility to protect, preserve and share the best current medical information to enable more informed decisions, enhance relationships between patients and professionals, and improve health care outcomes around the world. That’s why we are making the Merck Manuals available for free in digital form to professionals and patients around the world. No registration or subscription required, and no ads. NOND-1179303-0001 04/16 This mobile application is intended for use in the United States, its territories, Puerto Rico, and Canada only. For more information please read the End User License Agreement at https://www.merck.com/policy/terms-of-use/merck-apps-home.html. For more information about our privacy practices, please see our privacy commitment at https://www.msdprivacy.com To report an adverse event with a specific Merck product, please call the Merck National Service Center at 1-800-672-6372. For questions or help with the app, please contact merckmanualsinfo@merck.com

About

Relief Central

Access critical disaster relief information, including country data, international travel health advisories, and field operations guides. Stay updated with the latest news from reputable organizations and find relevant research through journal citations.

Highlights
  • World Factbook data
  • CDC Yellow Book travel health
  • USAID Field Operations Guide
  • Disaster relief news feeds
  • Prime PubMed Search
  • Cross-linking and navigation
  • Note-taking and highlighting
Features
Read full description

Relief Central is a free mobile and web resource developed by staff and friends of Unbound Medicine. It includes the latest versions of The World Factbook from the CIA, CDC Health Information for International Travel (The Yellow Book), the Field Operations Guide from USAID, Prime PubMed Search, and Relief News from the Red Cross, United Nations, US Centers for Disease Control, CDC, FEMA, and more. THE WORLD FACTBOOK The World Factbook from the US Central Intelligence Agency (CIA) contains detailed information on the history, people, government, economy, geography, communications, transportation, military, and transnational issues for 266 world countries and territories. CDC YELLOW BOOK (Health Information for International Travel) The Yellow Book presents advice on any travel health issue including vaccinations, essential trip planning and safety tips, prevention of an expanded list of travel-related infectious diseases, altitude illness, motion sickness, sunburn, medical tourism, and much more. USAID FIELD OPERATIONS GUIDE The Field Operations Guide from USAID delivers disaster assessment and response information and includes chapters and appendices ranging from information on populations at risk to commonly used acronyms, all arranged in an outline format. RELIEF NEWS Relief News puts the latest news at your fingertips with a collection of RSS feeds from trusted non-profit groups, international organizations, and government agencies. Feeds are from the Red Cross, United Nations, US Centers for Disease Control and Prevention (CDC), US Federal Emergency Management Agency (FEMA), ReliefWeb, and more. Prime PubMed Search Prime provides citations and abstracts from the latest issues of trusted disaster relief journals. Link to the fully-integrated Prime service where you can find related articles and view full-text articles provided by the journal publisher. FEATURES: • Cross Links for fast navigation between resources • Personalized favorites • Highlight and note-taking • Citations and abstracts from disaster journals • Advanced Search helps to find topics fast • Recently Viewed Unbound Privacy Policy: www.unboundmedicine.com/privacy Unbound Terms of Use: https://www.unboundmedicine.com/end_user_license_agreement

Screenshots

Merck Manual Consumer4 screens
Relief Central4 screens

Verdict

The call

The clearest difference is monetization model: Merck Manual Consumer at free against Relief Central's free with in-app purchases. Merck Manual Consumer also leads on review sentiment (88% vs 66%) and iOS requirement (13.0 vs 15.0). Relief Central's advantage is ratings volume (924 vs 169). On price, rating, update cadence and ads there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.6 for Merck Manual Consumer against 4.6 for Relief Central. That said, the two scores are not equally well evidenced: Relief Central has 924 ratings behind it against 169, so its average is the more settled of the two. Written reviews are what separate them: 88% of Merck Manual Consumer's written reviews are positive against 66% of Relief Central's.

UpkeepUpdate frequency

Merck Manual Consumer ships an update every 4 months, Relief Central every 5 months. Both last shipped on October 29, 2026.

Scorecard4 real differences · 6 level
Merck Manual Consumer versus Relief Central: the parameters behind the verdict, then further details
ParameterMerck Manual ConsumerRelief Central
PriceFreeFree
Rating4.6 (169 ratings)4.6 (924 ratings) — better
Positive reviews87.9% of reviews — better66.0% of reviews
Number of ratings169924 — better
Update frequencyEvery 4 months — betterEvery 5 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.0 — better15.0
Further details — not scored
Size200 MB9 MB
Age rating17+12+
DeveloperMerck & Co IncUnbound Medicine, Inc.

Customer experience

Merck Manual Consumer

All ratings164 ratings
Positive90.9%
Neutral3.0%
Negative6.1%
Written reviews91 reviews
Positive87.9%
Neutral1.1%
Negative11.0%

Relief Central

All ratings924 ratings
Positive91.7%
Neutral3.7%
Negative4.7%
Written reviews50 reviews
Positive66.0%
Neutral2.0%
Negative32.0%

User reviews

Merck Manual Consumer

From 169 App Store ratings

What we love

  • 👍 Trustworthy knowledge source
  • 👍 Excellent and handy resource
  • 👍 Valuable information
  • 👍 Easy to understand
  • 👍 Authoritative and current

Room to improve

  • 🐛 App freezes when searching
  • 🐛 App keeps crashing
  • 🐛 Search crashes
  • 🐛 Unable to load data
  • 🐛 Search aborts

Relief Central

From 924 App Store ratings

What we love

  • 👍 Excellent
  • 💡 Helpful tool
  • 👍 Best info
  • 👍 Great app
  • 👍 Exceptional

Room to improve

  • 🤔 Where did the COVID section go?
  • 🤔 This app is too hard to use
  • 🤔 In a nutshell, CRAP
  • 🤔 Cheating app for vivid-19!
  • 🤔 Français

Bugs and requests

Merck Manual Consumer

Reported bugs

6 issues
  • App freezes when searching for specific terms
  • App crashes repeatedly, especially during searches
  • App crashes when searching for 'Flea'
  • App crashes after update
  • Unable to load data
Show 1 more
  • Download banner obscures the entire display

Requested features

4 requests
  • More intuitive search for related topics
  • Improve search algorithms for easier topic finding
  • Allow changing font size
  • Fix download banner issue

Relief Central

Reported bugs

1 issue
  • The app crashes when trying to open ReliefWeb articles (or any links under it).

Requested features

1 request
  • Please update. The app fails to include psychologists as a profession, but has mental health counselors and psychiatrists.

In-app purchases

None

Merck Manual Consumer

No in-app purchases

None

Relief Central

No in-app purchases

Questions

Is Merck Manual Consumer free?
Merck Manual Consumer is free to download, with no in-app purchases.
Is Relief Central free?
Relief Central is free to download, with no in-app purchases.
Which has better reviews, Merck Manual Consumer or Relief Central?
Relief Central is rated higher. Merck Manual Consumer averages 4.6 out of 5 from 169 ratings, while Relief Central averages 4.6 from 924 ratings.
Do Merck Manual Consumer or Relief Central have ads?
Neither Merck Manual Consumer nor Relief Central shows ads.
Which is updated more often, Merck Manual Consumer or Relief Central?
Merck Manual Consumer ships an update every 4 months, and Relief Central every 5 months. Most recently, Merck Manual Consumer was updated on October 29, 2026 and Relief Central on October 29, 2026.

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