Comparison

Guide to Diagnostic Tests vs Clinical Constellation Bundle

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

Head to head
About

Guide to Diagnostic Tests

Access evidence-based information on over 450 diagnostic tests, including lab work, imaging, and therapeutic monitoring. This resource helps healthcare professionals quickly find answers to common questions about test selection, interpretation, and patient preparation.

Highlights
  • 450+ diagnostic tests
  • Evidence-based recommendations
  • Algorithms, tables, and charts
  • PubMed links
  • Custom notes and highlighting
  • Full-text search
  • Favorites for bookmarking
Features
Read full description

ABOUT GUIDE TO DIAGNOSTIC TESTS Pocket Guide to Diagnostic Tests, provides immediate, evidence-based information on the selection and interpretation of commonly used laboratory and electrocardiographic tests, diagnostic imaging, and therapeutic monitoring. Including more than 450 updated diagnostic tests, this mobile resource is ideal for answering questions encountered daily by physicians, nurses, students, and other healthcare professionals, such as: • Which test is best to diagnose or follow a patient’s condition? • What is the correct interpretation of an abnormal diagnostic test? • How do I collect the appropriate specimen or prepare the patient for testing? • Where can I find more information on this test in the medical literature? FEATURES • 450+ updated laboratory and diagnostic tests • Evidence-based recommendations • New and updated coverage of emerging and re-emerging pathogens and infectious agents • Extensive use of algorithms, tables, and charts • PubMed links directly to journal citations and available articles • Highlight and make custom notes within any entry • Full Text Search – find topics across from any entry • ‘Favorites’ for bookmarking important entries Editors: Diana Nicoll, MD, PhD, MPA; Chuanyi Mark Lu, MD; Stephen J. McPhee, MD Publisher: McGraw Hill Powered by: Unbound Medicine

About

Clinical Constellation Bundle

This comprehensive medical resource bundle provides essential information for healthcare professionals and students. Access diagnoses, treatment options, drug information, and clinical guidelines offline, anywhere. Features smart search technology for quick and accurate results.

Highlights
  • 900+ medical conditions
  • Clinical practice guidelines
  • Differential diagnosis tool
  • Drug information guide
  • Medical calculators
  • ICD-10-CM codes
  • Offline access
Features
Read full description

Essential resources Physicians, Nurse Practitioners, Physicians Assistants, Residents and Medical students entering 3rd and 4th year clinical rotations. The best friend you’ll have at 3AM is the Skyscape Clinical Constellation Bundle. Carry all the knowledge you need on your phone or tablet for those middle-of-the night head-scratchers and crises, and be a pro on rounds in the morning. As stand-alone apps, you will be able to use them anywhere on your campus, even in the deepest bowels of the hospital where the Wifi just doesn’t reach. The Skyscape patented SmartSearch technology will help you find the right diagnoses, treatment options, and dosages quickly, as well as more accurately, then Google or any other online search engine. 
 For a limited time – Save over $160 with this exclusive offer. What you will receive: • Ferri's Clinical Advisor: Quick access to 900+ common medical conditions. Diseases & disorders, differential diagnosis & lab results- all updated by experts in key clinical fields. Built-in calculators. 140+ interactive flowcharts • CURRENT Practice Guidelines in Primary Care : Guidelines and recommendations for the most common outpatient conditions from sources you can trust! Clear, concise and clinically relevant. • MobileDDx™ - Differential Diagnosis Tool: Choose to explore topics by organ system, symptoms or diseases only, or search across all topics. For example, if you wish to review the causes of a patient's chief complaint, simply select the symptom or sign from the main index. • Little Black Book of Primary Care: Concise descriptions of diseases and conditions relevant to docs in "doc talk" language, with up-to-date as well as classic references. • Dr. Drugs Drug Guide for Physicians: Delivers all of the information you need to administer medications safely across the lifespan - well-organized monographs for hundreds of generic and thousands of trade-name drugs. • Skyscape Labs™: Specifically developed for use on mobile devices, with a consistent and intuitive format. Healthcare providers will be able to rapidly obtain a description of the test; understand its clinical utility; and see what a high or low value might mean. •  Skyscape Clinical Calculator PLUS™: With over 200 preprogrammed medical formulae, the Clinical Calculator includes tools such as glomerular filtration rates, BMI, peak flow, narcotic equivalence, pregnancy dating, syncope decision trees, rules, scoring systems, and hundreds more. Find the calculator you need in just 1-3 clicks in most cases. • International Classification of Diseases, Tenth Revision, Clinical Modification: Based on the World Health Organization's Tenth Revision, International Classification of Diseases (ICD-10). ICD-10-CM is the official system of assigning codes to diagnoses and procedures associated with hospital utilization in the United States.es, rules, scoring systems, and hundreds more. Find the calculator you need in just 1-3 clicks in most cases.   Rely on Skyscape for trusted sources containing high-quality information, as used by students and resident for over 40 years. The Clinical Constellation Bundle will be your guiding light in the middle of the night! Publisher: Elsevier Health Sciences Company | Jones & Bartlett | McGraw-Hill | Skyscape

Screenshots

Guide to Diagnostic Tests4 screens
Clinical Constellation Bundle4 screens

Verdict

The call

Guide to Diagnostic Tests and Clinical Constellation Bundle both sit at 4.6 stars, but that hides the real split: 67% of Clinical Constellation Bundle's written reviews are positive against 0% of Guide to Diagnostic Tests's. Clinical Constellation Bundle also leads on monetization model (free vs free with in-app purchases) and iOS requirement (10.0 vs 15.0). Guide to Diagnostic Tests's advantage is update cadence (every 9 months vs every 23 months) and ratings volume (35 vs 9). On price, rating, ads and in-app purchases 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. Guide to Diagnostic Tests sells 1 one-off in-app purchase and Clinical Constellation Bundle sells 21 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Guide to Diagnostic Tests holds the better App Store score, 4.6 against 4.4. Both are backed by a comparable volume of ratings — 35 and 9 respectively. Written reviews complicate that: 0% of Guide to Diagnostic Tests's written reviews are positive against 67% of Clinical Constellation Bundle's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Guide to Diagnostic Tests ships an update every 9 months, Clinical Constellation Bundle every 23 months. Both last shipped on October 24, 2026.

Scorecard5 real differences · 5 level
Guide to Diagnostic Tests versus Clinical Constellation Bundle: the parameters behind the verdict, then further details
ParameterGuide to Diagnostic TestsClinical Constellation Bundle
PriceFreeFree
Rating4.6 (35 ratings) — better4.4 (9 ratings)
Positive reviews0.0% of reviews66.7% of reviews — better
Number of ratings35 — better9
Update frequencyEvery 9 months — betterEvery 23 months
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.010.0 — better
Further details — not scored
Size10 MB57 MB
Age rating17+17+
DeveloperUnbound Medicine, Inc.Skyscape Medpresso Inc

Customer experience

Guide to Diagnostic Tests

All ratings35 ratings
Positive88.6%
Neutral5.7%
Negative5.7%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

Clinical Constellation Bundle

All ratings9 ratings
Positive88.9%
Neutral0.0%
Negative11.1%
Written reviews3 reviews
Positive66.7%
Neutral0.0%
Negative33.3%

In-app purchases

1 purchases

Guide to Diagnostic Tests

One-time1
  • Pocket Guide to Diagnostic Tests$54.99
21 purchases

Clinical Constellation Bundle

One-time21
  • ICD10-Clinical Modification 23$1.99
  • ICD10-Clinical Modification 25$1.99
  • ICD10-Clinical Modification 24$1.99
Show 18 more
  • Mobile DDx$4.99
  • Skyscape Clinical Calculator+$4.99
  • Black Book of Primary Care$9.99
  • Current Practice Guideline$39.99
  • Current Practice Guideline 24$39.99
  • Skyscape Labs™$49.99
  • DrDrugs DrugGuide Physicians22$49.99
  • Can DrugGuide-Physicians 2023$49.99
  • DrDrugs DrugGuide Physicians23$49.99
  • DrDrugs DrugGuide Physicians25$49.99
  • DrDrugs DrugGuide Physicians24$49.99
  • Can DrugGuide-Physicians 2024$49.99
  • Ferri's Clinical Advisor 23$89.99
  • Ferri's Clinical Advisor 25$89.99
  • Ferri's Clinical Advisor 24$89.99
  • Clinical Constellation 2023$169.99
  • Clinical Constellation 2024$169.99
  • Clinical Constellation 2025$169.99

Questions

Is Guide to Diagnostic Tests free?
Guide to Diagnostic Tests is free to download, with in-app purchases available.
Is Clinical Constellation Bundle free?
Clinical Constellation Bundle is free to download, with in-app purchases available.
Which has better reviews, Guide to Diagnostic Tests or Clinical Constellation Bundle?
Guide to Diagnostic Tests is rated higher. Guide to Diagnostic Tests averages 4.6 out of 5 from 35 ratings, while Clinical Constellation Bundle averages 4.4 from 9 ratings.
Do Guide to Diagnostic Tests or Clinical Constellation Bundle have ads?
Neither Guide to Diagnostic Tests nor Clinical Constellation Bundle shows ads.
Which is updated more often, Guide to Diagnostic Tests or Clinical Constellation Bundle?
Guide to Diagnostic Tests ships an update every 9 months, and Clinical Constellation Bundle every 23 months. Most recently, Guide to Diagnostic Tests was updated on October 24, 2026 and Clinical Constellation Bundle on October 24, 2026.

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