Comparison

VisualDx vs Diagnosaurus® DDx

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

Head to head
About

VisualDx

This visual reference tool aids medical professionals in improving patient engagement and diagnostic accuracy. It utilizes AI and a vast image atlas to help build custom differentials, share patient-specific images, and access comprehensive diagnostic information. Earn continuing education credits while making better medical decisions.

Highlights
  • Build custom differentials
  • Engage patients with visual aids
  • Improve diagnostic accuracy
  • Access therapy and test options
  • Recognize infectious diseases
  • Earn CME credits
Currently charting
Read full description

VisualDx is a visual reference tool for medical professionals that leverages AI technology and a comprehensive image atlas to support faster, more confident decisions, fewer unnecessary referrals and testing, and higher patient engagement and satisfaction. With VisualDx, clinicians can: • Build dynamic differentials that evolve as you think. • Use guided support to surface clinically relevant results. • Compare diagnoses to improve decisions for your patients. • Use our AI to take a picture of your patient’s skin condition to better understand morphology and possibilities. • Engage with patients by sharing pictures of skin that reflect their disease presentation. • Access therapy and testing recommendations across over 3,500 conditions. • Quickly recognize infectious diseases and travel-related illnesses with our public health resources. • Test your diagnostic skills with our image challenges and educational resources. • Earn 0.5 AMA PRA Category 1 Credits™ for internet point of care activity with every search. See why this award-winning clinical decision support system is being used in more than 2,300 hospitals, clinics, and medical schools by physicians, nurses, students, PAs, NPs, and other healthcare professionals worldwide. VisualDx requires a subscription. Terms of Use: https://www.visualdx.com/legal/acceptable-use-policy-notice Privacy Policy: https://www.visualdx.com/legal/privacy-policy/

About

Diagnosaurus® DDx

This medical reference tool assists healthcare professionals in performing differential diagnoses quickly and confidently. It offers a searchable database of over 1,000 diagnoses, cross-referenced for related conditions, and allows users to save favorite entries and make custom notes.

Highlights
  • Over 1,000 differential diagnoses
  • Search by organ system, symptom, or disease
  • See Related DDx feature
  • Save favorite entries
  • Highlight and make custom notes
  • Universal Index Search
Features
Read full description

** Top-Selling App Used by Tens of Thousands of Health Professionals, Worldwide ** ABOUT DIAGNOSAURUS DDX This quick-reference tool helps healthcare professionals perform differential diagnosis with speed and confidence at the point of care. With Diagnosaurus you can quickly search over 1,000 diagnoses by organ system, symptom, or disease, or you can view all entries. Use the valuable “See Related DDx” feature within each entry to consider alternative diagnoses and quickly link to those entries. The convenient “Favorites” feature allows you to save specific searches and bookmark in your personal archive. FEATURES • More than 1,000 differential diagnoses • Highlight and make custom notes within entries • Entries organized in quick-read format • “See Related DDx” links to other potential diagnoses • Disease, symptom, and organ system indexes • “Favorites” for bookmarking important entries • Universal Index Search to help find answers fast Author: Roni F. Zeiger, MD Publisher: McGraw-Hill Medical Powered by: Unbound Medicine

Screenshots

VisualDx4 screens
Diagnosaurus® DDx4 screens

Verdict

The call

The clearest difference is monetization model: Diagnosaurus® DDx at free with in-app purchases against VisualDx's subscription. Diagnosaurus® DDx also leads on rating (4.8 vs 4.4) and ratings volume (2.5K vs 186). VisualDx's advantage is review sentiment (84% vs 53%) and update cadence (fortnightly vs every 10 months). On price, ads, in-app purchases and iOS requirement 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. VisualDx sells 11 in-app purchases, starting at $39.99 per month and Diagnosaurus® DDx sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Diagnosaurus® DDx holds the better App Store score, 4.8 against 4.4. That said, the two scores are not equally well evidenced: Diagnosaurus® DDx has 2.5K ratings behind it against 186, so its average is the more settled of the two. Written reviews complicate that: 84% of VisualDx's written reviews are positive against 53% of Diagnosaurus® DDx's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

VisualDx ships an update fortnightly, Diagnosaurus® DDx every 10 months. The most recent releases landed on September 23, 2026 and September 24, 2026 respectively.

Scorecard7 real differences · 4 level
VisualDx versus Diagnosaurus® DDx: the parameters behind the verdict, then further details
ParameterVisualDxDiagnosaurus® DDx
PriceFreeFree
Rating4.4 (186 ratings)4.8 (2.5K ratings) — better
Positive reviews84.3% of reviews — better53.2% of reviews
Number of ratings1862.5K — better
Update frequencyFortnightly — betterEvery 10 months
AdsNoNo
In-app purchasesYesYes
MonetizationSubscriptionFree with in-app purchases — better
Best chart rank#15 — better—
DevicesiPhone, iPadiPhone, iPad, iPod, Mac — better
Requires iOS16.415.0 — better
Further details — not scored
Size226 MB18 MB
Age rating17+17+
DeveloperLogical ImagesUnbound Medicine, Inc.

Customer experience

VisualDx

All ratings186 ratings
Positive83.3%
Neutral4.8%
Negative11.8%
Written reviews102 reviews
Positive84.3%
Neutral1.0%
Negative14.7%

Diagnosaurus® DDx

All ratings2,485 ratings
Positive96.2%
Neutral1.6%
Negative2.2%
Written reviews77 reviews
Positive53.2%
Neutral2.6%
Negative44.2%

User reviews

VisualDx

From 186 App Store ratings

What we love

  • 📸 Excellent clinical images and kodachromes
  • 👍 User-friendly interface and easy navigation
  • 🎓 Comprehensive differential diagnosis tool
  • 📚 Detailed disease summaries and treatment information
  • 🌍 Inclusive representation of skin of color

Room to improve

  • 💰 Expensive subscription cost
  • ❌ Difficult subscription cancellation process
  • 🐛 App crashes and performance issues
  • 📱 Quiz feature laggy and unreliable
  • 😤 Poor customer service responsiveness

Diagnosaurus® DDx

From 2.5K App Store ratings

What we love

  • 👍 User-friendly interface
  • 🚀 Quick access to differential diagnoses
  • 💡 Helpful for building differential diagnoses
  • 👍 Comprehensive coverage of conditions
  • 👍 Useful for medical students and practitioners

Room to improve

  • 🐛 Lack of in-depth information
  • 🐛 Incomplete differential diagnoses
  • 🐛 Lack of links to explain conditions
  • 🐛 Requires in-app purchase to access full content
  • 🐛 Unreliable update mechanism

Bugs and requests

VisualDx

Reported bugs

6 issues
  • App crashes when using quiz feature
  • CME credit claiming functionality fails
  • Subscription cancellation not processed
  • Renewal charges despite cancellation requests
  • Quiz unable to load properly
Show 1 more
  • Account access issues after payment

Requested features

6 requests
  • Make app free again (previously free)
  • Simplify subscription cancellation in-app
  • Improve quiz functionality for mobile
  • Add quiz feature to desktop version
  • Expand patient information handouts
Show 1 more
  • Better quiz image clarity and context

Diagnosaurus® DDx

Reported bugs

3 issues
  • Subscription issues and inability to restore purchases
  • Blank pages and non-functional content
  • Compatibility issues with newer iOS versions

Requested features

5 requests
  • Add ability to edit or add custom differential diagnoses
  • Improve search functionality and navigation
  • Provide more detailed information on conditions
  • Integrate with other medical resources and databases
  • Improve support for older devices and iOS versions

In-app purchases

11 purchases

VisualDx

Subscriptions9
  • Complete (1 Month)1 Month trial$39.991 Month
  • VisualDx Core Monthly7 Days trial$39.991 Month
  • Complete+DermExpert (1 Month)1 Month trial$49.991 Month
Show 6 more
  • VisualDx Elite Monthly7 Days trial$49.991 Month
  • Add DermExpert (1 Year)$99.991 Year
  • Complete (1 Year)1 Month trial$149.991 Year
  • VisualDx Core Annual7 Days trial$249.991 Year
  • VisualDx Elite Annual7 Days trial$299.991 Year
  • Complete+DermExpert (1 Year)1 Month trial$499.991 Year
One-time2
  • Add DermExpert (1 yr)$99.99
  • Complete (1 yr)$399.99
1 purchases

Diagnosaurus® DDx

One-time1
  • Diagnosaurus DDx$4.99

Questions

Is VisualDx free?
VisualDx is free to download, with in-app purchases available.
Is Diagnosaurus® DDx free?
Diagnosaurus® DDx is free to download, with in-app purchases available.
Which has better reviews, VisualDx or Diagnosaurus® DDx?
Diagnosaurus® DDx is rated higher. VisualDx averages 4.4 out of 5 from 186 ratings, while Diagnosaurus® DDx averages 4.8 from 2.5K ratings.
Do VisualDx or Diagnosaurus® DDx have ads?
Neither VisualDx nor Diagnosaurus® DDx shows ads.
Which is updated more often, VisualDx or Diagnosaurus® DDx?
VisualDx ships an update fortnightly, and Diagnosaurus® DDx every 10 months. Most recently, VisualDx was updated on September 23, 2026 and Diagnosaurus® DDx on September 24, 2026.

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