Opioids Dosage Conversion vs Contraception
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Opioid dosage conversion
- Multiple drug support
- Multiple route support
- Breakthrough dosing calculator
- Incomplete cross tolerance option
- Instructional details
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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).
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.
- 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
Verdict
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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
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.
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.
| Parameter | Opioids Dosage Conversion | Contraception |
|---|---|---|
| Price | Free | Free |
| Rating | 4.3 (18 ratings) | 4.3 (27 ratings) — better |
| Positive reviews | 77.8% of reviews — better | 63.6% of reviews |
| Number of ratings | 18 | 27 — better |
| Update frequency | Every 4 months — better | Every 7 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.6 — better | 16.0 |
| Further details — not scored | ||
| Size | 2 MB | 56 MB |
| Age rating | 17+ | 12+ |
| Developer | Chris Marcellino MD LLC | Centers For Disease Control and Prevention |
Customer experience
Opioids Dosage Conversion
Contraception
In-app purchases
Opioids Dosage Conversion
No in-app purchases
Contraception
No in-app purchases
Questions
Is Opioids Dosage Conversion free?
Is Contraception free?
Which has better reviews, Opioids Dosage Conversion or Contraception?
Do Opioids Dosage Conversion or Contraception have ads?
Which is updated more often, Opioids Dosage Conversion or Contraception?
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