Comparison

Opioids Dosage Conversion vs Opioid Tool

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Opioid dosage conversion
  • Multiple drug support
  • Multiple route support
  • Breakthrough dosing calculator
  • Incomplete cross tolerance option
  • Instructional details
Features
Read full description

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).

About

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.

Highlights
  • Opioid conversion calculator
  • 30-day refill calculator
  • Opioid metabolite reference
  • Prescribing checklist
Features
Read full description

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

Opioids Dosage Conversion4 screens
Opioid Tool1 screens

Verdict

The call

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

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

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.

UpkeepUpdate frequency

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.

Scorecard4 real differences · 6 level
Opioids Dosage Conversion versus Opioid Tool: the parameters behind the verdict, then further details
ParameterOpioids Dosage ConversionOpioid Tool
PriceFreeFree
Rating4.3 (18 ratings) — better3.6 (8 ratings)
Positive reviews77.8% of reviews — better40.0% of reviews
Number of ratings18 — better8
Update frequencyEvery 4 monthsEvery 5 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.67.0 — better
Further details — not scored
Size2 MB1 MB
Age rating17+4+
DeveloperChris Marcellino MD LLCaaron sobol

Customer experience

Opioids Dosage Conversion

All ratings17 ratings
Positive82.4%
Neutral5.9%
Negative11.8%
Written reviews45 reviews
Positive77.8%
Neutral13.3%
Negative8.9%

Opioid Tool

All ratings8 ratings
Positive75.0%
Neutral0.0%
Negative25.0%
Written reviews5 reviews
Positive40.0%
Neutral0.0%
Negative60.0%

In-app purchases

None

Opioids Dosage Conversion

No in-app purchases

None

Opioid Tool

No in-app purchases

Questions

Is Opioids Dosage Conversion free?
Opioids Dosage Conversion is free to download, with no in-app purchases.
Is Opioid Tool free?
Opioid Tool is free to download, with no in-app purchases.
Which has better reviews, Opioids Dosage Conversion or Opioid Tool?
Opioids Dosage Conversion is rated higher. Opioids Dosage Conversion averages 4.3 out of 5 from 18 ratings, while Opioid Tool averages 3.6 from 8 ratings.
Do Opioids Dosage Conversion or Opioid Tool have ads?
Neither Opioids Dosage Conversion nor Opioid Tool shows ads.
Which is updated more often, Opioids Dosage Conversion or Opioid Tool?
Opioids Dosage Conversion ships an update every 4 months, and Opioid Tool every 5 days. Most recently, Opioids Dosage Conversion was updated on September 17, 2026 and Opioid Tool on September 10, 2026.

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