Comparison

Opioids Dosage Conversion vs MKSAP 19

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

MKSAP 19

This medical education app provides access to current information in internal medicine and subspecialties. It includes exam-like questions and patient-based clinical scenarios to help physicians assess and update their knowledge. Offline access to content is available for subscribers.

Highlights
  • Current internal medicine information
  • 1,200 exam-like multiple-choice questions
  • Patient-based clinical scenarios
  • Offline content access
  • Syncs with online version
  • Enhances learning with figures, charts, and tables
Features
Read full description

This app supplements the online version and is included with the MKSAP 19 Digital, MKSAP 19 Complete Green, and MKSAP 19 Complete subscriptions. Simply log in with your ACP or MKSAP 19 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 Medical Knowledge Self-Assessment Program® (MKSAP® 19) 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. MKSAP 19 consists of well-researched text sections and 1,200 exam-like multiple-choice questions along with hundreds of figures, charts, and tables to enhance your learning experience. MKSAP 19'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 subscribers to MKSAP 19 Digital, MKSAP 19 Complete Green, or MKSAP 19 Complete 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.

Screenshots

Opioids Dosage Conversion4 screens
MKSAP 191 screens

Verdict

The call

The clearest difference is update cadence: MKSAP 19 at every 2 months against Opioids Dosage Conversion's every 4 months. MKSAP 19 also leads on iOS requirement (12.0 vs 15.6). On price, rating, review sentiment and ratings volume 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 4.1. Both are backed by a comparable volume of ratings — 18 and 37 respectively. Written reviews point the same way: 78% of Opioids Dosage Conversion's written reviews are positive against 71% of MKSAP 19's.

UpkeepUpdate frequency

Opioids Dosage Conversion ships an update every 4 months, MKSAP 19 every 2 months. The most recent releases landed on September 17, 2026 and September 14, 2026 respectively.

Scorecard2 real differences · 8 level
Opioids Dosage Conversion versus MKSAP 19: the parameters behind the verdict, then further details
ParameterOpioids Dosage ConversionMKSAP 19
PriceFreeFree
Rating4.3 (18 ratings) — better4.1 (37 ratings)
Positive reviews77.8% of reviews — better70.6% of reviews
Number of ratings1837 — better
Update frequencyEvery 4 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.612.0 — better
Further details — not scored
Size2 MB423 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%

MKSAP 19

All ratings37 ratings
Positive73.0%
Neutral16.2%
Negative10.8%
Written reviews17 reviews
Positive70.6%
Neutral17.6%
Negative11.8%

In-app purchases

None

Opioids Dosage Conversion

No in-app purchases

None

MKSAP 19

No in-app purchases

Questions

Is Opioids Dosage Conversion free?
Opioids Dosage Conversion is free to download, with no in-app purchases.
Is MKSAP 19 free?
MKSAP 19 is free to download, with no in-app purchases.
Which has better reviews, Opioids Dosage Conversion or MKSAP 19?
Opioids Dosage Conversion is rated higher. Opioids Dosage Conversion averages 4.3 out of 5 from 18 ratings, while MKSAP 19 averages 4.1 from 37 ratings.
Do Opioids Dosage Conversion or MKSAP 19 have ads?
Neither Opioids Dosage Conversion nor MKSAP 19 shows ads.
Which is updated more often, Opioids Dosage Conversion or MKSAP 19?
Opioids Dosage Conversion ships an update every 4 months, and MKSAP 19 every 2 months. Most recently, Opioids Dosage Conversion was updated on September 17, 2026 and MKSAP 19 on September 14, 2026.

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