Opioids Dosage Conversion vs Opioid Tool
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Opioids Dosage Conversion
This app is a calculator for trained medical professionals to convert opioid analgesic dosages. It supports various common opioids and administration routes, offering features like breakthrough dosing and cross-tolerance calculations.
- Opioid dosage conversion
- Multiple drug support
- Multiple route support
- Breakthrough dosing calculator
- Incomplete cross tolerance option
- Instructional details
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Opioids by Chris Marcellino MD and Norris Vivatrat MD is an opioid analgesic dosage conversion calculator for use by trained medical professionals. The application supports conversion to and from opioids commonly prescribed and used in U.S. hospitals orally, parenterally, or transdermally, including morphine, codeine, hydromorphone, hydrocodone, fentanyl, methadone, oxycodone and oxymorphone. The application is intended to help and instruct in the process of conversion of opioid regimens. • Native support for iPhone, iPad and iPod touch • Multiple route support • Multiple drug support • Incomplete cross tolerance option • Breakthrough dosing calculator • Provides instructional details about each calculation • Saves last calculation on exit • Supports landscape and portrait modes • Reference guide By Professor EBM, the Internal Medicine Residency Teaching Resource for Evidence-Based Medicine: http://www.professorebm.com/, a resource of the Santa Clara Valley Medical Center. While effort has been made to ensure that calculations are accurate and that conversion factors are in accordance with current accepted medical practices, use of this application is entirely at your own risk. This application should only be used by trained medical professionals and all results should be double checked by hand. Use of the app requires acceptance of the terms of use that are included with the application. Please send support requests and feedback using the link in the About tab of the app, though as a free academic tool we only have limited resources to address new feature requests. Opioid equipotency data is taken from CAPC conversion values except where noted (see the reference tab in the app.) CAPC values are as published in the Center to Advance Palliative Care Prescribing Opioids: A Reference Guide curriculum, which are adapted from McPherson ML. Demystifying Opioid Conversion Calculations: A Guide for Effective Dosing, 2nd ed. American Society of Health-System Pharmacists, Bethesda, Maryland, 2018. EPEC values are as published in EPEC-O Participants Handbook, 2005. Chris Marcellino, MD — Mayo Clinic Norris Vivatrat, MD — UCSD Medical Center Special thanks to Dr. Tom Mouser (EveryStep, Des Moines, IA) and Dr. David Rand (UVM Medical Center).
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: Opioids Dosage Conversion at 4.3 against Opioid Tool's 3.6. Opioids Dosage Conversion also leads on review sentiment (78% vs 40%). Opioid Tool's advantage is update cadence (every 5 days vs every 4 months) and iOS requirement (7.0 vs 15.6). 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Opioids Dosage Conversion holds the better App Store score, 4.3 against 3.6. Both are backed by a comparable volume of ratings — 18 and 8 respectively. Written reviews point the same way: 78% of Opioids Dosage Conversion's written reviews are positive against 40% of Opioid Tool's.
Opioids Dosage Conversion ships an update every 4 months, Opioid Tool every 5 days. The most recent releases landed on September 17, 2026 and September 10, 2026 respectively.
| Parameter | Opioids Dosage Conversion | Opioid Tool |
|---|---|---|
| Price | Free | Free |
| Rating | 4.3 (18 ratings) — better | 3.6 (8 ratings) |
| Positive reviews | 77.8% of reviews — better | 40.0% of reviews |
| Number of ratings | 18 — better | 8 |
| Update frequency | Every 4 months | Every 5 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.6 | 7.0 — better |
| Further details — not scored | ||
| Size | 2 MB | 1 MB |
| Age rating | 17+ | 4+ |
| Developer | Chris Marcellino MD LLC | aaron sobol |
Customer experience
Opioids Dosage Conversion
Opioid Tool
In-app purchases
Opioids Dosage Conversion
No in-app purchases
Opioid Tool
No in-app purchases
Questions
Is Opioids Dosage Conversion free?
Is Opioid Tool free?
Which has better reviews, Opioids Dosage Conversion or Opioid Tool?
Do Opioids Dosage Conversion or Opioid Tool have ads?
Which is updated more often, Opioids Dosage Conversion or Opioid Tool?
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