Comparison

Opioids Dosage Conversion vs ASRA Coags

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

ASRA Coags

This app provides quick access to anticoagulation guidelines for regional anesthesia and interventional pain procedures. It offers drug-specific summaries, recommendations based on procedure type, and detailed information on medication mechanisms and guideline documents.

Highlights
  • Anticoagulation guideline reference
  • Drug-specific summary information
  • Regional anesthesia guidelines
  • Interventional pain guidelines
  • Search by drug or procedure
  • Recommendations by block and intervention type
Features
Read full description

The ASRA COAGS app has been updated with a universal code base and a fresh new look. This subscription-based app is $6.99/annually or free with ASRA Pain Medicine membership. The app transforms the American Society of Regional Anesthesia and Pain Medicine anticoagulation guidelines for Regional Anesthesia and Interventional Pain Procedures into a quick and easy reference for your practice. It provides rapid access to drug-specific summary information. This version combines the most current recommendations from two separate publications: 1. The 2025 guidelines “Regional anesthesia in the patient receiving antithrombotic or thrombolytic therapy: American Society of Regional Anesthesia and Pain Medicine Evidence- Based Guidelines (Fifth Edition)” published in Regional Anesthesia & Pain Medicine. 2. The 2018 Interventional Pain guidelines from the publication “Interventional Spine and Pain Procedures in Patients on Antiplatelet and Anticoagulant Medications (Second Edition); Guidelines From the American Society of Regional Anesthesia and Pain Medicine, the European Society of Regional Anaesthesia and Pain Therapy, the American Academy of Pain Medicine, the International Neuromodulation Society, the North American Neuromodulation Society, and the World Institute of Pain” published in Regional Anesthesia & Pain Medicine. The app provides direct access to both the regional guidelines and the pain guidelines, also allowing you to choose a default and focus on your specific practice area. Regional Guidelines: 1. Search for drugs by brand name or generic name. 2. Get recommendations based on the block type (e.g. neuraxial, peripheral, obstetric) and the intervention type (e.g. placing a block or removing a catheter). 3. Access more detailed information by using the Information "i" button: a. Mechanism of action for each drug. b. Executive summary for each drug. c. The full 2025 ASRA Pain Medicine regional guideline document. Pain Guidelines: 1. Search for drugs by brand name or generic name. Or start your search by procedure. 2. Get recommendations for: a. High, intermediate, and low risk procedures. b. Modifiers for patients at higher bleeding risk. c. Herbal medications. d. Antidepressant medications. e. When to restart medications after a procedure. 3. Access more detailed information for any drug by using the Information "i" button: a. Mechanism of action for each drug. b. Executive summary for each drug. c. The full 2018 ASRA Pain Medicine interventional pain guideline document. Members of ASRA Pain Medicine receive all society apps for free with their membership. To learn more or to join, visit asra.com/membership. Non-members have access to the content with a low-cost annual subscription.

Screenshots

Opioids Dosage Conversion4 screens
ASRA Coags4 screens

Verdict

The call

The clearest difference is review sentiment: Opioids Dosage Conversion at 78% against ASRA Coags's 10%. Opioids Dosage Conversion also leads on rating (4.3 vs 1.3) and monetization model (free vs subscription). ASRA Coags's advantage is ratings volume (407 vs 18) and iOS requirement (13.4 vs 15.6). On price, update cadence, ads and in-app purchases 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 1.3. That said, the two scores are not equally well evidenced: ASRA Coags has 407 ratings behind it against 18, so its average is the more settled of the two. Written reviews point the same way: 78% of Opioids Dosage Conversion's written reviews are positive against 10% of ASRA Coags's.

UpkeepUpdate frequency

Opioids Dosage Conversion ships an update every 4 months, ASRA Coags every 3 months. The most recent releases landed on September 17, 2026 and September 21, 2026 respectively.

Scorecard5 real differences · 5 level
Opioids Dosage Conversion versus ASRA Coags: the parameters behind the verdict, then further details
ParameterOpioids Dosage ConversionASRA Coags
PriceFreeFree
Rating4.3 (18 ratings) — better1.3 (407 ratings)
Positive reviews77.8% of reviews — better9.7% of reviews
Number of ratings18407 — better
Update frequencyEvery 4 monthsEvery 3 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterSubscription
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.613.4 — better
Further details — not scored
Size2 MB27 MB
Age rating17+17+
DeveloperChris Marcellino MD LLCAmerican Society of Regional Anesthesia and Pain Medicine

Customer experience

Opioids Dosage Conversion

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

ASRA Coags

All ratings407 ratings
Positive6.6%
Neutral0.2%
Negative93.1%
Written reviews207 reviews
Positive9.7%
Neutral0.5%
Negative89.9%

In-app purchases

None

Opioids Dosage Conversion

No in-app purchases

None

ASRA Coags

No in-app purchases

Questions

Is Opioids Dosage Conversion free?
Opioids Dosage Conversion is free to download, with no in-app purchases.
Is ASRA Coags free?
ASRA Coags is free to download, with no in-app purchases.
Which has better reviews, Opioids Dosage Conversion or ASRA Coags?
Opioids Dosage Conversion is rated higher. Opioids Dosage Conversion averages 4.3 out of 5 from 18 ratings, while ASRA Coags averages 1.3 from 407 ratings.
Do Opioids Dosage Conversion or ASRA Coags have ads?
Neither Opioids Dosage Conversion nor ASRA Coags shows ads.
Which is updated more often, Opioids Dosage Conversion or ASRA Coags?
Opioids Dosage Conversion ships an update every 4 months, and ASRA Coags every 3 months. Most recently, Opioids Dosage Conversion was updated on September 17, 2026 and ASRA Coags on September 21, 2026.

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