Comparison

Opioids Dosage Conversion vs CARMA For Life

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

CARMA For Life

This medical application assists healthcare professionals in managing cardiac arrest resuscitation events. It provides real-time guidance through ACLS protocols, including timers, diagnostic tips, and treatment recommendations, aiming to improve patient survival rates.

Highlights
  • ACLS protocol guidance
  • Countdown timers
  • Ventricular Tachycardia/Fibrillation reference
  • Diagnostic Tips (H's and T's)
  • Medication and treatment recommendations
  • Audible CPR metronome
  • Session logging and emailing
Features
Read full description

CARMA, the Cardiac Arrest Resuscitation Mobile Application, is an ACLS tool designed to help guide practitioners through bedside resuscitation. Preliminary trials using the algorithm presented in CARMA has resulted in an 80% increase in patient survival of a CPR event. CARMA has four independent countdown timers, swipe-able Ventricular Tachycardia & Ventricular Fibrillation and Pulseless Electrical Activity (PEA) reference pages. There is a complete list of select-able Diagnostic Tips (H's and T's) and recommended medication and non-medication treatment solutions. CARMA is an invaluable, portable tool for healthcare professionals in the resuscitation of patients experiencing cardiopulmonary arrest. CARMA includes an audible CPR metronome which defaults to 100 beats/minute, and timers for Epinephrine, Amniodarone and code duration. The duration timer prompts the leader to reevaluate every 30 minutes. Each timer has a unique vibrate feature when it completes its cycle. All of CARMA's timer durations, rates and audible features are configurable through CARMA's preferences menu. CARMA also features a logging process that automatically tracks all activities within a session.  They include timer starts and stops, H's and T's selections, rhythm, medication and non-drug intervention selections.  Each event is time stamped for easy review.  In addition, the session log can be easily emailed for archiving purposes.  In conformance with HIPAA requirements, no patient information is stored in the log and the log does not reside in the physical space of the mobile device.  Once the application exits or is reset, the log is deleted. CARMA is an ACLS tool which gives healthcare providers the ability to better manage cardio-pulmonary events. It guides the provider through ACLS protocols in real time at the bedside utilizing the 2014 American Heart Association (AHA) guidelines, leading to better outcomes. For more information visit www.carmaforlife.com

Screenshots

Opioids Dosage Conversion4 screens
CARMA For Life1 screens

Verdict

The call

The clearest difference is price: Opioids Dosage Conversion at Free against CARMA For Life's $5.99. CARMA For Life's advantage is update cadence (monthly vs every 4 months) and iOS requirement (8.0 vs 15.6). On rating, review sentiment, 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

Opioids Dosage Conversion is free to download; CARMA For Life costs $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.3 for Opioids Dosage Conversion against 4.4 for CARMA For Life. Both are backed by a comparable volume of ratings — 19 and 15 respectively. Written reviews are what separate them: 78% of Opioids Dosage Conversion's written reviews are positive against 82% of CARMA For Life's.

UpkeepUpdate frequency

Opioids Dosage Conversion ships an update every 4 months, CARMA For Life monthly. Both last shipped on November 1, 2026.

Scorecard4 real differences · 6 level
Opioids Dosage Conversion versus CARMA For Life: the parameters behind the verdict, then further details
ParameterOpioids Dosage ConversionCARMA For Life
PriceFree — better$5.99
Rating4.3 (19 ratings)4.4 (15 ratings) — better
Positive reviews77.8% of reviews81.8% of reviews — better
Number of ratings19 — better15
Update frequencyEvery 4 monthsMonthly — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.68.0 — better
Further details — not scored
Size2 MB4 MB
Age rating17+12+
DeveloperChris Marcellino MD LLCACLS SOLUTIONS, LLC

Customer experience

Opioids Dosage Conversion

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

CARMA For Life

All ratings15 ratings
Positive86.7%
Neutral6.7%
Negative6.7%
Written reviews22 reviews
Positive81.8%
Neutral4.5%
Negative13.6%

In-app purchases

None

Opioids Dosage Conversion

No in-app purchases

None

CARMA For Life

No in-app purchases

Questions

Is Opioids Dosage Conversion free?
Opioids Dosage Conversion is free to download, with no in-app purchases.
Is CARMA For Life free?
CARMA For Life costs $5.99, with no in-app purchases.
Which has better reviews, Opioids Dosage Conversion or CARMA For Life?
CARMA For Life is rated higher. Opioids Dosage Conversion averages 4.3 out of 5 from 19 ratings, while CARMA For Life averages 4.4 from 15 ratings.
Do Opioids Dosage Conversion or CARMA For Life have ads?
Neither Opioids Dosage Conversion nor CARMA For Life shows ads.
Which is updated more often, Opioids Dosage Conversion or CARMA For Life?
Opioids Dosage Conversion ships an update every 4 months, and CARMA For Life monthly. Most recently, Opioids Dosage Conversion was updated on November 1, 2026 and CARMA For Life on November 1, 2026.

Other comparisons