Diagnosaurus® DDx vs Bullets*
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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** 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
Bullets*
Access medical and orthopedic educational content, including topics, questions, and cases. Create custom exams, review scientific articles, and monitor community activity. Earn CME credits through self-assessment exams and collaborative learning.
- Medical and orthopedic topics
- Customizable exams (Testmaster)
- Article review with PDFs
- Community activity feed
- Earn CME credits
- Point of Care Learning (PoCL)
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The companion APP for Orthobullets.com and Medbullets.com. Bullets* contains medbullets and orthobullets Topics, Questions, Techniques, Cases, Videos, and Evidence. Our Testmaster allows you to create, take, and review customized exams. Article links allows for quick review of scientific abstracts and often the PDF is provided and can be viewed on your phone. Our "Home" screen allows you to monitor a thread of educational activity within our community. All educational activity, including the Qbank, is synced with the main platform for seamless use on both your iPhone APP and computer. You can earn CME by taking Self-Assessment Exams and contributing to our free collaboration community by posting educational comments with scientific references as part of our Point of Care Learning (PoCL) activity. All CME Study Plan examinations can be taken on the iPhone and can be found on your CME Dashboard. Residents on the PASS institutional platform can take PASS exams, complete their PASS Skillmaster learning modules, and submit both Rotation and Milestone Skill Evaluations to faculty. Faculty members using PASS Pro 2.0 can grade Rotation Evaluations and Milestone Skill Evaluations on the APP, eliminating the need to log in with each evaluation.
Screenshots
Verdict
The clearest difference is rating: Diagnosaurus® DDx at 4.8 against Bullets*'s 4.0. Diagnosaurus® DDx also leads on ratings volume (2.5K vs 62). Bullets*'s advantage is in-app purchases (none vs 1) and update cadence (every 8 days vs every 10 months). On price, ads and device support 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
Both are free to download. Diagnosaurus® DDx sells 1 one-off in-app purchase. Bullets* asks for nothing beyond the download.
Diagnosaurus® DDx holds the better App Store score, 4.8 against 4.0. That said, the two scores are not equally well evidenced: Diagnosaurus® DDx has 2.5K ratings behind it against 62, so its average is the more settled of the two. Written reviews complicate that: 53% of Diagnosaurus® DDx's written reviews are positive against 68% of Bullets*'s, so the app with the better star average is not the one people write more warmly about.
Diagnosaurus® DDx ships an update every 10 months, Bullets* every 8 days. Both last shipped on October 26, 2026.
| Parameter | Diagnosaurus® DDx | Bullets* |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (2.5K ratings) — better | 4.0 (62 ratings) |
| Positive reviews | 53.2% of reviews | 67.6% of reviews — better |
| Number of ratings | 2.5K — better | 62 |
| Update frequency | Every 10 months | Every 8 days — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 19 MB | 168 MB |
| Age rating | 17+ | 17+ |
| Developer | Unbound Medicine, Inc. | LineageMedical Inc |
Customer experience
Diagnosaurus® DDx
Bullets*
Bugs and requests
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
Bullets*
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Diagnosaurus® DDx
- Diagnosaurus DDx$4.99
Bullets*
No in-app purchases
Questions
Is Diagnosaurus® DDx free?
Is Bullets* free?
Which has better reviews, Diagnosaurus® DDx or Bullets*?
Do Diagnosaurus® DDx or Bullets* have ads?
Which is updated more often, Diagnosaurus® DDx or Bullets*?
Other comparisons
