Comparison

ECG Guide 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

ECG Guide

This comprehensive reference app provides over 200 high-quality ECG examples and in-depth explanations for medical professionals and students. It offers stepwise interpretation assistance, a large library of common and complex findings, and quiz questions to test knowledge.

Highlights
  • Over 200 high-resolution sample ECGs
  • In-depth reference text on ECG interpretation
  • Stepwise ECG Interpreter assistance
  • Over 100 multiple-choice quiz questions
  • Rapid Reference section for quick interpretation
  • Clear descriptions of arrhythmias and findings
  • Pediatric values included
Features
Currently charting
Read full description

The most comprehensive ECG app in the iPhone App Store - over 200 examples of common and uncommon ECGs iPad version? bit.ly/ECGiPad or search iTunes "ECG Guide iPad" Praise for the ECG Guide: "The best ECG app currently available." -iMedicalApps.com "Core Medical App." - Georgetown Medical School. “This brand-new gem features concise explanations with ample high-quality ECG examples...” - American College of Emergency Physicians “...a 5 star application” - User review “...a must have application for doctors, residents and medical students.” - User review Succinct yet authoritative, this ECG reference is a critical companion for practicing physicians, medical trainees, nurses and paramedics. It is designed as a learning tool for those still training as well as a reliable reference for more experienced interpreters of ECGs. ***************************** Features: - Full reference text that includes in-depth information on topics such as: - Approach to ECG Interpretation - Analysis of rate, rhythm, axis, P wave, QRS complex, ST segment, T wave and QT interval - Ventricular hypertrophy and atrial enlargement - Assessment of ischemia - Approach to arrhythmia - Bradyarrythmias and tachyarrythmias, Heart block, and much more… (content based on national guidelines 2009 AHA/ACCF/HRS Recommendations for the standardization and interpretation of the electrocardiogram) - The largest ECG library available on the iPhone with over 200 high resolution sample ECGs with common and complex findings for easy reference - ECG Interpreter - Stepwise assistance with ECG interpretation. Helps create differential diagnosis based on simple to assess ECG features. - Over 100 multiple-choice quiz questions to test your knowledge - Rapid Reference section - one tap takes you to 11 summary pages used to confidently interpret ECGs - Clear descriptions of both common and complex arrhythmias and ECG findings - Review etiology and differential diagnosis of common and complex arrhythmias and ECG findings - Pediatric values included Compiled and written by Jason Andrade, MD, FRCPC.

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

ECG Guide3 screens
Diagnosaurus® DDx4 screens

Verdict

The call

The clearest difference is price: Diagnosaurus® DDx at Free against ECG Guide's $0.99. Diagnosaurus® DDx also leads on rating (4.8 vs 3.6) and ratings volume (2.5K vs 8). ECG Guide's advantage is in-app purchases (none vs 1) and update cadence (every 2 months vs every 10 months). On 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

Diagnosaurus® DDx is free to download; ECG Guide costs $0.99 up front. Diagnosaurus® DDx sells 1 one-off in-app purchase. ECG Guide asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Diagnosaurus® DDx holds the better App Store score, 4.8 against 3.6. That said, the two scores are not equally well evidenced: Diagnosaurus® DDx has 2.5K ratings behind it against 8, so its average is the more settled of the two. Written reviews complicate that: 76% of ECG Guide'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

ECG Guide ships an update every 2 months, Diagnosaurus® DDx every 10 months. Both last shipped on October 22, 2026.

Scorecard10 real differences · 1 level
ECG Guide versus Diagnosaurus® DDx: the parameters behind the verdict, then further details
ParameterECG GuideDiagnosaurus® DDx
Price$0.99Free — better
Rating3.6 (8 ratings)4.8 (2.5K ratings) — better
Positive reviews75.8% of reviews — better53.2% of reviews
Number of ratings82.5K — better
Update frequencyEvery 2 months — betterEvery 10 months
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
Best chart rank#189 — better—
DevicesiPhone, iPodiPhone, iPad, iPod, Mac — better
Requires iOS11.0 — better15.0
Further details — not scored
Size26 MB19 MB
Age rating17+17+
DeveloperWebMDUnbound Medicine, Inc.

Customer experience

ECG Guide

All ratings8 ratings
Positive62.5%
Neutral12.5%
Negative25.0%
Written reviews132 reviews
Positive75.8%
Neutral7.6%
Negative16.7%

Diagnosaurus® DDx

All ratings2,500 ratings
Positive96.2%
Neutral1.6%
Negative2.2%
Written reviews77 reviews
Positive53.2%
Neutral2.6%
Negative44.2%

User reviews

ECG Guide

From 8 App Store ratings

What we love

  • 📚 Comprehensive ECG reference material and content
  • 👍 Excellent for medical professionals (doctors, nurses, paramedics, residents)
  • 🎯 Well-organized and easy-to-navigate interface
  • 📊 Large library of high-quality sample ECG strips
  • 🧠 Helpful quiz feature for testing knowledge

Room to improve

  • ❌ Not suitable for general public/non-medical users
  • 🎨 Outdated UI design and appearance
  • 📱 Poor iPad compatibility
  • 🔐 Requires email registration after purchase
  • 💸 Separate purchase required for iPad version

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

ECG Guide

Reported bugs

7 issues
  • App crashes at startup
  • Incompatible with iOS 4 (fixed in later updates)
  • Incompatible with iOS 11 (64-bit update needed)
  • UI appears blown-up and blurry on iPhone 6+
  • Cannot exit ECG view when rotated sideways
Show 2 more
  • Crashes after OS 3.0 update
  • Incorrect pricing display in some regions

Requested features

14 requests
  • iPad support and optimization
  • Highlight or circle abnormalities on ECG images
  • Search functionality for finding specific content
  • Customizable quiz difficulty levels
  • ACLS algorithms integration
Show 9 more
  • Pediatric reference tables and criteria
  • Arrows and annotations on ECG samples
  • Corrected QT calculator
  • Alternate lead placement information (Fontane, Brugada)
  • Notes and favorites functionality
  • Camera integration to analyze ECG photos
  • Device synchronization between iPhone and iPad
  • More heart block examples
  • Smoother landscape/portrait transitions

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

None

ECG Guide

No in-app purchases

1 purchases

Diagnosaurus® DDx

One-time1
  • Diagnosaurus DDx$4.99

Questions

Is ECG Guide free?
ECG Guide costs $0.99, with no in-app purchases.
Is Diagnosaurus® DDx free?
Diagnosaurus® DDx is free to download, with in-app purchases available.
Which has better reviews, ECG Guide or Diagnosaurus® DDx?
Diagnosaurus® DDx is rated higher. ECG Guide averages 3.6 out of 5 from 8 ratings, while Diagnosaurus® DDx averages 4.8 from 2.5K ratings.
Do ECG Guide or Diagnosaurus® DDx have ads?
Neither ECG Guide nor Diagnosaurus® DDx shows ads.
Which is updated more often, ECG Guide or Diagnosaurus® DDx?
ECG Guide ships an update every 2 months, and Diagnosaurus® DDx every 10 months. Most recently, ECG Guide was updated on October 22, 2026 and Diagnosaurus® DDx on October 22, 2026.

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