Comparison

Preop Eval vs WarfarinGuide

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

WarfarinGuide

This app provides evidence-based resources for anticoagulation management with Warfarin. It includes guidelines on indications, INR targets, and treatment duration, along with protocols for dose adjustment and initiation. It also offers guidance for peri-operative Warfarin management.

Highlights
  • Warfarin dose adjustment protocols
  • Warfarin initiation protocols
  • INR target guidelines
  • Peri-operative Warfarin management
  • ACCP guideline references
  • Point of care guides
Features
Read full description

Warfarin Guide offers three resources essential for systematic and careful evidence-based anticoagulation with Warfarin. First it reviews recommendations on indications, INR targets, and treatment duration from the American College of Chest Physicians 8th Edition guidelines on Antithrombotic and Thrombolytic Therapy from 2008, updated for the 2012 guideline. Second it offers a protocol for Warfarin dose adjustment depending upon INR result. And third is a discussion of protocols for the initiation of Warfarin. These resources come from point of care guides on these topics in the family medicine literature as well as the 2012 ACCP guideline. The app also offers guidance for management of peri-operative Warfarin by directing the user to oexcellent comprehensive resources for managing all anticoagulants and antiplatelet agents around surgery. The app addresses such common questions as: •which artificial heart valves require that higher level of anticoagulation? •how do I respond to an INR of 7.4? •this pt needs Warfarin, how do I get it started? •I'm adjusting the total weekly warfarin dose down by 5%, when should I recheck the INR? •when do I give Vitamin K to reverse Warfarin anticoagulation and at what dose?? This app is written and intended for practicing clinicians involved in Warfarin anticoagulation such as internists, cardiologists, family physicians, nurses, pharmacists, PA's and NP's; 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
WarfarinGuide4 screens

Verdict

The call

The clearest difference is rating: Preop Eval at 5.0 against WarfarinGuide's 3.8. WarfarinGuide's advantage is review sentiment (90% vs 67%) and iOS requirement (13.0 vs 16.6). On price, ratings volume, update cadence and ads 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.

ReceptionRating · Positive reviews · Number of ratings

Preop Eval holds the better App Store score, 5.0 against 3.8. Both are backed by a comparable volume of ratings — 2 and 5 respectively. Written reviews complicate that: 67% of Preop Eval's written reviews are positive against 90% of WarfarinGuide's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Preop Eval ships an update every 6 months, WarfarinGuide every 11 months. The most recent releases landed on September 10, 2026 and July 25, 2026 respectively.

Scorecard3 real differences · 7 level
Preop Eval versus WarfarinGuide: the parameters behind the verdict, then further details
ParameterPreop EvalWarfarinGuide
PriceFreeFree
Rating5.0 (2 ratings) — better3.8 (5 ratings)
Positive reviews66.7% of reviews90.0% of reviews — better
Number of ratings25 — better
Update frequencyEvery 6 months — betterEvery 11 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPodiPhone, iPod
Requires iOS16.613.0 — better
Further details — not scored
Size15 MB1 MB
Age rating17+17+
DeveloperUnited Health Services, Inc.Joshua D. steinberg

Customer experience

Preop Eval

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews12 reviews
Positive66.7%
Neutral8.3%
Negative25.0%

WarfarinGuide

All ratings5 ratings
Positive60.0%
Neutral0.0%
Negative40.0%
Written reviews10 reviews
Positive90.0%
Neutral0.0%
Negative10.0%

In-app purchases

None

Preop Eval

No in-app purchases

None

WarfarinGuide

No in-app purchases

Questions

Is Preop Eval free?
Preop Eval is free to download, with no in-app purchases.
Is WarfarinGuide free?
WarfarinGuide is free to download, with no in-app purchases.
Which has better reviews, Preop Eval or WarfarinGuide?
Preop Eval is rated higher. Preop Eval averages 5.0 out of 5 from 2 ratings, while WarfarinGuide averages 3.8 from 5 ratings.
Do Preop Eval or WarfarinGuide have ads?
Neither Preop Eval nor WarfarinGuide shows ads.
Which is updated more often, Preop Eval or WarfarinGuide?
Preop Eval ships an update every 6 months, and WarfarinGuide every 11 months. Most recently, Preop Eval was updated on September 10, 2026 and WarfarinGuide on July 25, 2026.

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