Comparison

Opioids Dosage Conversion vs ACP MKSAP

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

ACP MKSAP

Access comprehensive internal medicine knowledge and practice exam-style questions offline. This app syncs your progress with the online version when connected to the internet. It's designed for physicians to stay updated on the latest evidence and enhance their clinical decision-making skills.

Highlights
  • Offline access to text and questions
  • Thousands of exam-like multiple-choice questions
  • Patient-based clinical scenarios
  • Syncs progress with online version
  • Includes figures, charts, and tables
  • Targets knowledge gaps
Features
Read full description

This app supplements the online version and is included with your ACP MKSAP subscription. Simply log in with your ACP or ACP MKSAP username and password. If you need assistance setting up your account, visit ACP Online. Some functionality within the app requires an active Internet connection. Your suggestions for future updates and enhanced features are welcome at mksap_editors@acponline.org. The new ACP Medical Knowledge Self-Assessment Program℠ (ACP MKSAP℠) provides you with the most current and critical information in the core of internal medicine and its subspecialties so you can stay aware of what you need to know as a practicing physician in internal medicine today. ACP MKSAP consists of well-researched text sections and thousands of exam-like multiple-choice questions along with hundreds of figures, charts, and tables to enhance your learning experience. ACP MKSAP's original, high-quality questions comprise patient-based clinical scenarios based on the latest evidence. Each question will challenge your decision-making, help you discover areas of strength, and target areas for you to update or acquire new knowledge. This app enables ACP MKSAP subscribers to read all of the text and answer all of the questions offline. When you are connected to the Internet, answers will sync automatically with the online version. The publisher of this app, the American College of Physicians, is the largest medical specialty organization in the United States with members in more than 145 countries worldwide. ACP membership includes 161,000 internal medicine physicians (internists), related subspecialists, and medical students. Internal medicine physicians are specialists who apply scientific knowledge and clinical expertise to the diagnosis, treatment, and compassionate care of adults across the spectrum from health to complex illness. Subscriber License Agreement: https://mksap.acponline.org/license

Screenshots

Opioids Dosage Conversion4 screens
ACP MKSAP1 screens

Verdict

The call

The clearest difference is in-app purchases: Opioids Dosage Conversion at none against ACP MKSAP's 1. Opioids Dosage Conversion also leads on review sentiment (78% vs 57%). ACP MKSAP's advantage is update cadence (every 10 days vs every 4 months) and iOS requirement (13.0 vs 15.6). On price, rating, ratings volume and ads 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. ACP MKSAP sells 1 in-app purchase, starting at $999.99 per year. Opioids Dosage Conversion asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.3 for Opioids Dosage Conversion against 4.2 for ACP MKSAP. Both are backed by a comparable volume of ratings — 19 and 16 respectively. Written reviews are what separate them: 78% of Opioids Dosage Conversion's written reviews are positive against 57% of ACP MKSAP's.

UpkeepUpdate frequency

Opioids Dosage Conversion ships an update every 4 months, ACP MKSAP every 10 days. Both last shipped on October 21, 2026.

Scorecard5 real differences · 5 level
Opioids Dosage Conversion versus ACP MKSAP: the parameters behind the verdict, then further details
ParameterOpioids Dosage ConversionACP MKSAP
PriceFreeFree
Rating4.3 (19 ratings) — better4.2 (16 ratings)
Positive reviews77.8% of reviews — better57.1% of reviews
Number of ratings19 — better16
Update frequencyEvery 4 monthsEvery 10 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.613.0 — better
Further details — not scored
Size2 MB540 MB
Age rating17+17+
DeveloperChris Marcellino MD LLCAmerican College of Physicians

Customer experience

Opioids Dosage Conversion

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

ACP MKSAP

All ratings16 ratings
Positive81.3%
Neutral0.0%
Negative18.8%
Written reviews7 reviews
Positive57.1%
Neutral0.0%
Negative42.9%

In-app purchases

None

Opioids Dosage Conversion

No in-app purchases

1 purchases

ACP MKSAP

Subscriptions1
  • Non-member in-app price$999.991 Year

Questions

Is Opioids Dosage Conversion free?
Opioids Dosage Conversion is free to download, with no in-app purchases.
Is ACP MKSAP free?
ACP MKSAP is free to download, with in-app purchases available.
Which has better reviews, Opioids Dosage Conversion or ACP MKSAP?
Opioids Dosage Conversion is rated higher. Opioids Dosage Conversion averages 4.3 out of 5 from 19 ratings, while ACP MKSAP averages 4.2 from 16 ratings.
Do Opioids Dosage Conversion or ACP MKSAP have ads?
Neither Opioids Dosage Conversion nor ACP MKSAP shows ads.
Which is updated more often, Opioids Dosage Conversion or ACP MKSAP?
Opioids Dosage Conversion ships an update every 4 months, and ACP MKSAP every 10 days. Most recently, Opioids Dosage Conversion was updated on October 21, 2026 and ACP MKSAP on October 21, 2026.

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