Comparison

Opioids Dosage Conversion vs Contraception

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

Contraception

This app provides comprehensive guidelines on contraceptive method use based on medical eligibility criteria and selected practice recommendations. It assists healthcare providers in counseling individuals and couples on family planning choices, covering over 60 medical conditions and numerous clinical situations.

Highlights
  • U.S. Medical Eligibility Criteria (MEC)
  • U.S. Selected Practice Recommendations (SPR)
  • Covers over 60 characteristics/conditions
  • Addresses numerous clinical situations
  • Aids healthcare provider counseling
  • Based on CDC Morbidity and Mortality Weekly Report
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The U.S. Medical Eligibility Criteria for Contraceptive Use comprises recommendations for the use of specific contraceptive methods by patients who have certain characteristics or medical conditions. The U.S. Selected Practice Recommendations for Contraceptive Use addresses a select group of common, yet sometimes controversial or complex, issues regarding initiation and use of specific contraceptive methods. The app is developed directly from the CDC Morbidity and Mortality Weekly Report (MMWR) by the Division of Reproductive Health and covers more than 60 characteristics or medical conditions (U.S. MEC) and numerous clinical situations (U.S. SPR). These recommendations are intended to assist healthcare providers when they counsel women, men, and couples about contraceptive method choice and use. Although these recommendations are meant to serve as a source or clinical guidance, healthcare providers should always consider the individual clinical circumstances of each person seeking family planning services.

Screenshots

Opioids Dosage Conversion4 screens
Contraception4 screens

Verdict

The call

Opioids Dosage Conversion and Contraception both sit at 4.3 stars, but that hides the real split: 78% of Opioids Dosage Conversion's written reviews are positive against 64% of Contraception's. On price, rating, ratings volume and update cadence 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

On the App Store both sit at effectively the same score — 4.3 for Opioids Dosage Conversion against 4.3 for Contraception. Both are backed by a comparable volume of ratings — 18 and 27 respectively. Written reviews are what separate them: 78% of Opioids Dosage Conversion's written reviews are positive against 64% of Contraception's.

UpkeepUpdate frequency

Opioids Dosage Conversion ships an update every 4 months, Contraception every 7 months. The most recent releases landed on October 16, 2026 and October 17, 2026 respectively.

Scorecard1 real difference · 9 level
Opioids Dosage Conversion versus Contraception: the parameters behind the verdict, then further details
ParameterOpioids Dosage ConversionContraception
PriceFreeFree
Rating4.3 (18 ratings)4.3 (27 ratings) — better
Positive reviews77.8% of reviews — better63.6% of reviews
Number of ratings1827 — better
Update frequencyEvery 4 months — betterEvery 7 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.6 — better16.0
Further details — not scored
Size2 MB56 MB
Age rating17+12+
DeveloperChris Marcellino MD LLCCenters For Disease Control and Prevention

Customer experience

Opioids Dosage Conversion

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

Contraception

All ratings27 ratings
Positive81.5%
Neutral7.4%
Negative11.1%
Written reviews11 reviews
Positive63.6%
Neutral9.1%
Negative27.3%

In-app purchases

None

Opioids Dosage Conversion

No in-app purchases

None

Contraception

No in-app purchases

Questions

Is Opioids Dosage Conversion free?
Opioids Dosage Conversion is free to download, with no in-app purchases.
Is Contraception free?
Contraception is free to download, with no in-app purchases.
Which has better reviews, Opioids Dosage Conversion or Contraception?
Contraception is rated higher. Opioids Dosage Conversion averages 4.3 out of 5 from 18 ratings, while Contraception averages 4.3 from 27 ratings.
Do Opioids Dosage Conversion or Contraception have ads?
Neither Opioids Dosage Conversion nor Contraception shows ads.
Which is updated more often, Opioids Dosage Conversion or Contraception?
Opioids Dosage Conversion ships an update every 4 months, and Contraception every 7 months. Most recently, Opioids Dosage Conversion was updated on October 16, 2026 and Contraception on October 17, 2026.

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