Comparison

Preop Eval vs Convert Drugs Pro

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

Convert Drugs Pro

Features
Read full description

Find equivalent medications (same active ingredient) for your favorite drugs in 200+ countries using our exclusive in-app (no Internet needed) database of half a million products. So you are in a business trip to China and suddenly need one of your usual medications. How are you going to find it there? With Convert Drugs, in a few seconds and without Internet connection, you'll see a list of equivalent drug names and you can even show the local name full screen to the local pharmacist or doctor. New: "Wikipedia" button in the result view, showing Wikipedia information about this molecule (if it exists). Note: this feature requires an Internet connection. ============================================= WHAT IS CONVERT DRUGS? ============================================= Convert Drugs is a fast and easy to use application designed for travelers. It will provide the equivalent prescription or other the counter medications (commercial product names) in most countries in the world. ============================================= ACCURATE AND FREQUENTLY UPDATED DATABASE ============================================= The Convert Drugs' database has been compiled by a professional pharmacist and frequent updates (through app updates) will ensure you to always have the most complete list of medications in your pocket. Each update is carefully double checked before release. ============================================= EXTENSIVE DATABASE ============================================= The Convert Drugs' database covers almost 1 million drug names and more than 8000 molecules (generic names) in more than 200 countries. ============================================= NO INTERNET NEEDED ============================================= The database is stored with the application in your iPhone. This means that Convert Drugs will provide you with fast and accurate results even without any Internet connection (such as when you are traveling abroad). ============================================= FOR TRAVELERS ============================================= Don't leave the country without this application in your iPhone! You never know what can happen and you can't bring all your usual and favorite remedies with you... Should you be in urgent need of something, a quick search with the Convert Drugs application will allow you to find the equivalent products in the country your are visiting. ============================================= DISCLAIMER ============================================= This application does not provide medical advice. You must always check with a physician or pharmacist before purchasing or using any medication. In addition, the database can sometimes contain errors. ============================================= NOTE ============================================= The database in this application is a subset of our other application for health professionals: "Convert Drugs Premium". It does not include medications for severe diseases such as cancer. Also the Premium version offers more search options. ============================================= Comparison between the 3 versions: ============================================= - Free: Gives your the active ingredient only (generic) - Pro: Gives you the equivalent products in the country of your choice - Premium: Has multi-country search, search by molecule, and larger database with drugs for serious diseases.

Screenshots

Preop Eval4 screens
Convert Drugs Pro4 screens

Verdict

The call

The clearest difference is price: Preop Eval at Free against Convert Drugs Pro's $4.99. Convert Drugs Pro's advantage is iOS requirement (11.0 vs 16.6). On update cadence, 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

Preop Eval is free to download; Convert Drugs Pro costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Preop Eval ships an update every 6 months, Convert Drugs Pro every 4 months. The most recent releases landed on October 16, 2026 and October 26, 2026 respectively.

Scorecard2 real differences · 8 level
Preop Eval versus Convert Drugs Pro: the parameters behind the verdict, then further details
ParameterPreop EvalConvert Drugs Pro
PriceFree — better$4.99
Rating5.0 (2 ratings) — better—
Positive reviews66.7% of reviews—
Number of ratings2 — better—
Update frequencyEvery 6 monthsEvery 4 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhoneiPhone, iPod — better
Requires iOS16.611.0 — better
Further details — not scored
Size15 MB132 MB
Age rating17+17+
DeveloperUnited Health Services, Inc.TenTal

In-app purchases

None

Preop Eval

No in-app purchases

None

Convert Drugs Pro

No in-app purchases

Questions

Is Preop Eval free?
Preop Eval is free to download, with no in-app purchases.
Is Convert Drugs Pro free?
Convert Drugs Pro costs $4.99, with no in-app purchases.
Do Preop Eval or Convert Drugs Pro have ads?
Neither Preop Eval nor Convert Drugs Pro shows ads.
Which is updated more often, Preop Eval or Convert Drugs Pro?
Preop Eval ships an update every 6 months, and Convert Drugs Pro every 4 months. Most recently, Preop Eval was updated on October 16, 2026 and Convert Drugs Pro on October 26, 2026.

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