Comparison

Preop Eval vs Gout Diagnosis

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

Head to head
About

Preop Eval

This app provides guidance for evaluating and preparing adult patients for non-cardiac surgery. It includes algorithms and resources on medication management, cardiac event timing, and preoperative testing, serving as both a reference and a teaching tool for medical professionals.

Highlights
  • Cardiac evaluation algorithm
  • Medication guidance (starting/stopping)
  • Surgery timing after cardiac events
  • Preoperative testing recommendations
  • Review for students and residents
  • Perioperative insulin management
Features
Read full description

Preop Eval organizes and presents much of the guidance that one needs in order to evaluate and prepare adult patients for non-cardiac surgery. It is based upon the guidelines on this topic from the American College of Cardiology, the European Society of Anaesthesiology, the American Society of Anesthesiologists, the Institute for Clinical Systems Improvement, the American College of Chest Physicians, and more (full references in the app). The app contains 1 algorithm and 3 resources: the cardiac evaluation algorithm, guidance on starting and stopping key medications in the perioperative period, guidance on timing of surgery after cardiac events, and guidance on preoperative testing. It also contains a review of preoperative evaluation mainly for students and residents. The app addresses such common questions as: - who needs bloodwork before surgery? - who needs an EKG or a CXR? - how do I handle patients on warfarin, clopidogrel, and DOAC's? - which patients need adjustment of perioperative insulin and diabetic meds, and how? - which active cardiac conditions preclude surgery? - how long after MI or stent should a patient wait before surgery? - are there adjustments to make on psych meds, rheumatologic meds, ACE's and ARB's? This app is written and intended for practicing physicians like internists, family physicians, and hospitalists; for resident physician trainees; and for medical students. In addition to being a reference, the algorithm is written to be a teaching tool by not just delivering an answer, but instead walking a physician through the evaluation process so that one learns that process along the way. As an educator and clinician, I am interested in feedback and I would be grateful for guidance on improving the tool.

About

Gout Diagnosis

Features
Read full description

Gout is a tricky diagnosis to make. Rarely is it made via the gold standard technique of synovial aspiration and polarized light microscopy. The vast majority of diagnoses are clinical. A primary care and rheumatologist team of Dutch researchers led by Hein Janssens derived and published a clinical decision rule in 2010. This app brings that decision rule to primary care physicians, rheumatologists, and acute care (ER/urgent-care) clinicians everywhere. With just a few clicks of information about a patient's case, you can see what the gout diagnosis calculator suggests about the patient's chances of having gout or not having gout. The app is a collaboration by Dr. Joshua Steinberg and Dr. Hein Janssens, both family physicians. The first version offers English and Dutch versions. Updates coming soon will offer German, French, and Spanish versions. The app also contains educational background information about the diagnosis of gout in general and about how the gout diagnostic rule and calculator were developed and later validated. Full references to the literature are provided including links to Pub Med. Like all my apps, this app is intended for clinicians only, not the lay public. It is written to help family physicians, internists, general practitioners, rheumatologists, residents, and students consider the diagnosis of gout in those who present with acute mono-arthritis. As an educator and clinician myself, I am interested in feedback and I would be grateful for guidance on improving this tool.

Screenshots

Preop Eval4 screens
Gout Diagnosis4 screens

Verdict

The call

The clearest difference is iOS requirement: Gout Diagnosis at 7.0 against Preop Eval's 16.6. On price, update cadence, 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Preop Eval ships an update every 6 months, Gout Diagnosis every 5 months. The most recent releases landed on October 16, 2026 and October 9, 2026 respectively.

Scorecard1 real difference · 9 level
Preop Eval versus Gout Diagnosis: the parameters behind the verdict, then further details
ParameterPreop EvalGout Diagnosis
PriceFreeFree
Rating5.0 (2 ratings) — better—
Positive reviews66.7% of reviews—
Number of ratings2 — better—
Update frequencyEvery 6 monthsEvery 5 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhoneiPhone, iPod — better
Requires iOS16.67.0 — better
Further details — not scored
Size15 MB1 MB
Age rating17+17+
DeveloperUnited Health Services, Inc.Joshua D. steinberg

In-app purchases

None

Preop Eval

No in-app purchases

None

Gout Diagnosis

No in-app purchases

Questions

Is Preop Eval free?
Preop Eval is free to download, with no in-app purchases.
Is Gout Diagnosis free?
Gout Diagnosis is free to download, with no in-app purchases.
Do Preop Eval or Gout Diagnosis have ads?
Neither Preop Eval nor Gout Diagnosis shows ads.
Which is updated more often, Preop Eval or Gout Diagnosis?
Preop Eval ships an update every 6 months, and Gout Diagnosis every 5 months. Most recently, Preop Eval was updated on October 16, 2026 and Gout Diagnosis on October 9, 2026.

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