# ECG Guide vs Diagnosaurus® DDx

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.

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.

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.

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

## The numbers

| Metric | ECG Guide | Diagnosaurus® DDx |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | [3.6 (8 ratings)](https://appshunter.io/ios/app/ecg-guide/id301027070/reviews) | **[4.8 (2.5K ratings)](https://appshunter.io/ios/app/diagnosaurus-ddx/id833728910/reviews)** |
| Number of ratings | 8 | **2.5K** |
| Positive reviews | **75.8% of reviews** | 53.2% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 10 months |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 26 MB | 19 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 17+ | 17+ |
| Developer | [WebMD](https://appshunter.io/developer/295076332) | [Unbound Medicine, Inc.](https://appshunter.io/developer/300420400) |

## What reviewers say

### ECG Guide

[App page](https://appshunter.io/ios/app/ecg-guide/id301027070)

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:** macOS Compatibility, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 📚 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

**What reviewers complain about**

- ❌ 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

**Reported bugs**

- 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

**Requested features**

- iPad support and optimization
- Highlight or circle abnormalities on ECG images
- Search functionality for finding specific content
- Customizable quiz difficulty levels
- ACLS algorithms integration


### Diagnosaurus® DDx

[App page](https://appshunter.io/ios/app/diagnosaurus-ddx/id833728910)

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:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Diagnosaurus DDx | $4.99 | one-time |

**What reviewers like**

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

**What reviewers complain about**

- 🐛 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

**Reported bugs**

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

**Requested features**

- 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


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*