Opioids Dosage Conversion vs HAS
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).
HAS
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HAS-BLED bleeding risk calculator. Base on the article in Chest. 2010;138(5):1093-1100. doi:10.1378/chest.10-0134. The calculator estimates one year risk of major bleeding when using warfarin in atrial fibrillation. SOG's calculator has been designed with ease of use and clarity in mind. All selections are made on a single page and you can see the risk score and risk assessment change as you switch the options.
Screenshots
Verdict
The clearest difference is price: Opioids Dosage Conversion at Free against HAS's $0.99. HAS's advantage is update cadence (every 3 weeks vs every 4 months) and iOS requirement (8.0 vs 15.6). On ads, in-app purchases and device support 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
Opioids Dosage Conversion is free to download; HAS costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Opioids Dosage Conversion ships an update every 4 months, HAS every 3 weeks. The most recent releases landed on October 8, 2026 and October 6, 2026 respectively.
| Parameter | Opioids Dosage Conversion | HAS |
|---|---|---|
| Price | Free — better | $0.99 |
| Rating | 4.3 (18 ratings) — better | — |
| Positive reviews | 77.8% of reviews | — |
| Number of ratings | 18 — better | — |
| Update frequency | Every 4 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.6 | 8.0 — better |
| Further details — not scored | ||
| Size | 2 MB | 9 MB |
| Age rating | 17+ | 17+ |
| Developer | Chris Marcellino MD LLC | Timo Strid |
In-app purchases
Opioids Dosage Conversion
No in-app purchases
HAS
No in-app purchases
Questions
Is Opioids Dosage Conversion free?
Is HAS free?
Do Opioids Dosage Conversion or HAS have ads?
Which is updated more often, Opioids Dosage Conversion or HAS?
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