Comparison

Preop Eval vs DAPT Risk Calculator

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

DAPT Risk Calculator

This tool helps clinicians assess the risk and benefit of continuing dual antiplatelet therapy (DAPT) for patients at least 12 months post-PCI. It provides a numerical DAPT Risk Score and calculates the percentage risk for key cardiovascular events.

Highlights
  • DAPT Risk Score calculation
  • Risk/benefit analysis for DAPT continuation
  • Percentage risk for MI
  • Percentage risk for Stent Thrombosis/MACCE
  • Percentage risk for Bleeding
Features
Read full description

The ACC DAPT Risk Calculator provides clinical decision support for clinicians evaluating the continuation of DAPT therapy for patients at least 12 months post-PCI procedure, and the risk/benefit of continuing or discontinuing DAPT. The App provides a DAPT Risk Score as a numerical value between -2 and +9, where a Higher DAPT scores suggest that the benefit/risk ratio with prolonged DAPT may be favorable. Conversely, lower DAPT scores suggest that the benefit/risk ratio with prolonged DAPT is NOT favorable. The clinical decision support tool also calculates the percentage of risk for three end points: - Myocardial infarction (MI) - Stent thrombosis, major adverse cardiovascular and cerebrovascular events (MACCE) - Bleeding

Screenshots

Preop Eval4 screens
DAPT Risk Calculator3 screens

Verdict

The call

The clearest difference is rating: Preop Eval at 5.0 against DAPT Risk Calculator's 4.5. Preop Eval also leads on update cadence (every 6 months vs every 17 months). DAPT Risk Calculator's advantage is iOS requirement (13.0 vs 16.6). On price, ratings volume, 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.

ReceptionRating · Positive reviews · Number of ratings

Preop Eval holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 2 and 2 respectively.

UpkeepUpdate frequency

Preop Eval ships an update every 6 months, DAPT Risk Calculator every 17 months. The most recent releases landed on September 10, 2026 and September 12, 2026 respectively.

Scorecard3 real differences · 7 level
Preop Eval versus DAPT Risk Calculator: the parameters behind the verdict, then further details
ParameterPreop EvalDAPT Risk Calculator
PriceFreeFree
Rating5.0 (2 ratings) — better4.5 (2 ratings)
Positive reviews66.7% of reviews—
Number of ratings22
Update frequencyEvery 6 months — betterEvery 17 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS16.613.0 — better
Further details — not scored
Size15 MB46 MB
Age rating17+12+
DeveloperUnited Health Services, Inc.American College of Cardiology

Customer experience

Preop Eval

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

DAPT Risk Calculator

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Preop Eval

No in-app purchases

None

DAPT Risk Calculator

No in-app purchases

Questions

Is Preop Eval free?
Preop Eval is free to download, with no in-app purchases.
Is DAPT Risk Calculator free?
DAPT Risk Calculator is free to download, with no in-app purchases.
Which has better reviews, Preop Eval or DAPT Risk Calculator?
Preop Eval is rated higher. Preop Eval averages 5.0 out of 5 from 2 ratings, while DAPT Risk Calculator averages 4.5 from 2 ratings.
Do Preop Eval or DAPT Risk Calculator have ads?
Neither Preop Eval nor DAPT Risk Calculator shows ads.
Which is updated more often, Preop Eval or DAPT Risk Calculator?
Preop Eval ships an update every 6 months, and DAPT Risk Calculator every 17 months. Most recently, Preop Eval was updated on September 10, 2026 and DAPT Risk Calculator on September 12, 2026.

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