Comparison

Preop Eval vs Rabies

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

Rabies

Features
Read full description

Rabies Guide presents guidance for clinicians handling patients with potential rabies exposure. Based upon the New York State Dept of Health 2010 guideline supplemented by the Center for Disease Control and Prevention, the app walks the provider through the decision steps considering which animal was involved, the nature of the bite or exposure, the availability of the animal for rabies laboratory testing, and details on both rabies vaccine and immunoglobulin treatment. The app addresses such common questions as: • is a raccoon bite high risk for rabies? • how does patient management differ when the animal involved is or is not captured? • how do I handle a stray dog bite? • on what days do I administer the 4 or 5 rabies vaccine injections? • what are the special considerations for bat exposures, children, or intoxicated persons? • if a domesticated animal is well after a 10 day observation, is rabies post-exposure prophylaxis necessary? • do bites from pet hamsters require post-exposure prophylaxis? This app is written and intended for practicing clinicians like ER and urgent care center docs, family physicians, pediatricians, and internists; for resident physician trainees; and for medical students. As an educator and clinician, I am interested in feedback and I would be grateful for guidance on improving the tool.

Screenshots

Preop Eval4 screens
Rabies4 screens

Verdict

The call

The clearest difference is update cadence: Preop Eval at every 6 months against Rabies's every 30 months. Rabies's advantage is iOS requirement (12.0 vs 16.6). On price, ads, in-app purchases 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

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, Rabies every 30 months. The most recent releases landed on September 30, 2026 and October 9, 2026 respectively.

Scorecard2 real differences · 8 level
Preop Eval versus Rabies: the parameters behind the verdict, then further details
ParameterPreop EvalRabies
PriceFreeFree
Rating5.0 (2 ratings) — better—
Positive reviews66.7% of reviews—
Number of ratings2 — better—
Update frequencyEvery 6 months — betterEvery 30 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhoneiPhone, iPod — better
Requires iOS16.612.0 — better
Further details — not scored
Size15 MB1 MB
Age rating17+4+
DeveloperUnited Health Services, Inc.Joshua D. steinberg

In-app purchases

None

Preop Eval

No in-app purchases

None

Rabies

No in-app purchases

Questions

Is Preop Eval free?
Preop Eval is free to download, with no in-app purchases.
Is Rabies free?
Rabies is free to download, with no in-app purchases.
Do Preop Eval or Rabies have ads?
Neither Preop Eval nor Rabies shows ads.
Which is updated more often, Preop Eval or Rabies?
Preop Eval ships an update every 6 months, and Rabies every 30 months. Most recently, Preop Eval was updated on September 30, 2026 and Rabies on October 9, 2026.

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