Preop Eval vs Opioid Tool
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Cardiac evaluation algorithm
- Medication guidance (starting/stopping)
- Surgery timing after cardiac events
- Preoperative testing recommendations
- Review for students and residents
- Perioperative insulin management
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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.
Opioid Tool
This medical app provides tools for healthcare professionals rotating through specific rotations. It includes an opioid conversion calculator, a 30-day refill calculator, and a reference for opioid metabolites. A prescribing checklist is also available to aid in patient care.
- Opioid conversion calculator
- 30-day refill calculator
- Opioid metabolite reference
- Prescribing checklist
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An app for fellows and residents rotating through Dr. Bernstein's rotation. It contains an opioid conversion calculator, 30 day refill calculator, opioid metabolite reference, and prescribing checklist.
Screenshots
Verdict
The clearest difference is rating: Preop Eval at 5.0 against Opioid Tool's 3.6. Preop Eval also leads on review sentiment (67% vs 40%). Opioid Tool's advantage is update cadence (every 5 days vs every 6 months) and ratings volume (8 vs 2). On price, ads, in-app purchases and monetization model 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Preop Eval holds the better App Store score, 5.0 against 3.6. Both are backed by a comparable volume of ratings — 2 and 8 respectively. Written reviews point the same way: 67% of Preop Eval's written reviews are positive against 40% of Opioid Tool's.
Preop Eval ships an update every 6 months, Opioid Tool every 5 days. Both last shipped on September 10, 2026.
| Parameter | Preop Eval | Opioid Tool |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | 3.6 (8 ratings) |
| Positive reviews | 66.7% of reviews — better | 40.0% of reviews |
| Number of ratings | 2 | 8 — better |
| Update frequency | Every 6 months | Every 5 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 16.6 | 7.0 — better |
| Further details — not scored | ||
| Size | 15 MB | 1 MB |
| Age rating | 17+ | 4+ |
| Developer | United Health Services, Inc. | aaron sobol |
Customer experience
Preop Eval
Opioid Tool
In-app purchases
Preop Eval
No in-app purchases
Opioid Tool
No in-app purchases









