ClinicalKey vs Opioid Conversion Calculator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ClinicalKey
This app provides medical professionals with instant access to a vast library of clinical knowledge, including synoptic content and in-depth reference materials. It helps users stay updated on medical advancements, confirm diagnoses, and advance their research skills, all while offering CME/MOC/CE credits.
- Access to 30+ medical specialties
- Synoptic content for quick answers
- Full-text reference books and journals
- Mobile-optimized medical calculators
- Earn CME/MOC/CE credits
- Intuitive search functionality
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INSTITUTIONAL SUBSCRIPTION REQUIRED. Access the latest advances in clinical knowledge anytime, anywhere with ClinicalKey®- the essential resource for medical professionals. ClinicalKey combines the speed of synoptic content with the depth of a comprehensive clinical reference tool in one intuitive solution to provide clinicians trusted information in the moments that matter most. With ClinicalKey, you can: • Stay abreast of rapidly expanding clinical knowledge • Quickly confirm diagnosis and treatment information • Advance critical thinking skills and research Please note: To access our extensive content library, ensure you have a subscription to ClinicalKey from your organization. To get started: 1. Download the free ClinicalKey app for iOS on your iPad® or iPhone®. 2. Follow the prompts to connect to your organization’s account.The app will ask questions to get you to the right content. 3. Choose the method of access that is right for you: 4. Select Access via Network if you need a quick answer and your device is connected to your organization's network. 5. Select Access via Institution for other ways to connect. 6. Once you have gained access, create or sign- in to your Elsevier ClinicalKey user account to save favorites and earn CME/MOC/CE/MOC/CE. ClinicalKey® Because you want to find a better way to help your patients ClinicalKey combines the speed of synoptic content with the depth of a comprehensive clinical reference tool in one intuitive solution to give clinicians trusted information in the moments that matter. With the ClinicalKey, clinicians will be able to: • Enhance patient care with trusted resources and deep insights across 30+ specialties • Combine efficiency and confidence in your practice with access to quick answers and information that is continuously updated • Excel in your field by building foundational knowledge and keeping up with the latest trends through full-text reference books and journals, while earning free CME/MOC/CE credit • Stay abreast of rapidly expanding clinical knowledge • Quickly confirm diagnosis and treatment information • Advance critical thinking skills and research ClinicalKey App for iOS Features: • Trusted Comprehensive content covering more than 30 medical and surgical specialties • Easy-to-scan, clinically focused medical topic synopses • Intuitive search with auto-suggest/ • Easy search with auto-completion • Direct navigation to your favorite books and journals • Mobile-optimized medical calculators • Access to full-text books, full-text journals, guidelines, multimedia and more • Access via Institutional IP; individuals will not be able to earn CME/MOC/CE, save, or share content when using IP authentication. Please register for remote access via your institutional web version of ClinicalKey. ClinicalKey Registrants (non-IP) customers will enjoy: • Opportunity to earn CME and fulfill MOC requirements with the American Board of Internal Medicine (ABIM) • Ability to favorite and save content • Option to print and email topics, videos or graphics • Earn and track free CME/MOC/CE credit Ability to favorite and save content Print and email topics, videos or graphics to patients and colleagues iPad and iPhone are trademarks of Apple Inc, registered in the US and other countries.
Opioid Conversion Calculator
This medical app simplifies complex opioid conversion tasks for healthcare professionals. It offers extensive drug coverage, a visual safety indicator for dosages, and breakthrough dosing calculations. Available in multiple languages, it ensures accurate and safe pain management.
- Extensive drug coverage
- Visual safety indicator
- Breakthrough dosing calculations
- Formulation conversions
- Up-to-date pharmaceutical formulary
- Multilingual support
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Opioid Conversion Calculator is built for health professionals who need a clear, efficient way to compare opioid doses and review the clinical context behind a conversion. Built by a pharmacist. CALCULATE AND COMPARE - Calculate total oral morphine equivalent (OME) across multiple opioids and routes: oral, parenteral, rectal, sublingual and transdermal. - See every converted dose at once, after applying a chosen Target OME percentage for incomplete cross-tolerance. - View conservative, rounded-down target and breakthrough dose suggestions. - See where a daily dose sits: the header warms from orange at 50 mg/day (CDC 2022) to red at 120 mg/day (Opioids Aware). Adjust the thresholds or turn the guide off. - Methadone uses its own dose-dependent model, and its results are clearly marked as not a starting dose. - Convert the same opioid between routes, such as oral and parenteral morphine, with the method and sources shown. EVERY RESULT, IN CONTEXT - Each result opens with the converted dose, then products, clinical information, breakthrough dosing and switching timing. - Read practice points alongside formulation-specific pharmacology, with links to the supporting sources. - Check when to start the new opioid when switching between patches, modified-release opioids and CSCI. Switching timing is also in the menu, free for everyone. - View official products and strengths for Australia, the United States, Germany, France and Spain, chosen independently from the app language. TAILOR THE WORKFLOW - Edit conversion factors and choose which opioids appear, with Pro. - Export and import settings when moving between devices, with Pro. - Works offline, including on first launch. - Use the app in English, French, German, Italian, Portuguese (Brazil) or Spanish. PRO ACCESS The calculator stays free: the combined OME and every converted dose need no account or purchase. Pro adds breakthrough dosing, switching timing, products and clinical information to every result, plus custom conversion factors, opioid visibility and settings transfer. Your first detailed results are free to try. Available plans, prices and any introductory offer are shown using the information supplied by the App Store before purchase. Purchases can be restored in the app. CLINICAL USE Equianalgesic conversions are estimates and do not replace clinical judgement. Consider incomplete cross-tolerance, patient factors, formulation, route, local guidance and monitoring when interpreting a result. Review the references and terms of use before using the calculator in clinical practice. Privacy policy: https://opioidconversioncalculator.com/privacy Terms of use: https://opioidconversioncalculator.com/terms
Screenshots
Verdict
The clearest difference is in-app purchases: ClinicalKey at none against Opioid Conversion Calculator's 3. Opioid Conversion Calculator's advantage is review sentiment (38% vs 9%) and iOS requirement (13.0 vs 15.0). On price, update cadence, ads 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
Both are free to download. Opioid Conversion Calculator sells 3 in-app purchases, starting at $3.99 per month. ClinicalKey asks for nothing beyond the download.
ClinicalKey ships an update every 5 weeks, Opioid Conversion Calculator every 6 weeks. The most recent releases landed on October 16, 2026 and October 9, 2026 respectively.
| Parameter | ClinicalKey | Opioid Conversion Calculator |
|---|---|---|
| Price | Free | Free |
| Rating | — | 3.7 (17 ratings) — better |
| Positive reviews | 8.8% of reviews | 37.5% of reviews — better |
| Number of ratings | — | 17 — better |
| Update frequency | Every 5 weeks — better | Every 6 weeks |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Subscription | Free with in-app purchases — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 55 MB | 76 MB |
| Age rating | 12+ | 17+ |
| Developer | Elsevier Inc. | Ayrial Beall |
Customer experience
ClinicalKey
Opioid Conversion Calculator
Bugs and requests
ClinicalKey
Reported bugs
14 issues- App stuck on loading screen after initial login
- Forced logout when closing or minimizing app
- Institutional login not working despite web access
- App crashes during search queries
- OpenAthens authentication failures
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- Network change warnings appearing incorrectly
- Search results returning unrelated content
- Textbook search not finding available books
- App won't load after recent updates
- Blank search results for valid queries
- Scrolling in table of contents sidebar not functioning
- Landscape orientation not supported
- App doesn't remember page position when reopened
- Restricted access to books after updates
Requested features
10 requests- PDF download capability within the app
- Favorite/bookmark textbooks and articles
- Landscape mode support for iPad
- Find-on-page text search function
- Automatic session persistence and page memory
Show 5 moreShow fewer
- Text size and screen color customization
- Fingerprint/passcode login option
- Browse feature with category filtering
- Offline access to downloaded materials
- Feature parity with website version
Opioid Conversion Calculator
Not enough reviews yet to summarise bugs or requests.
In-app purchases
ClinicalKey
No in-app purchases
Opioid Conversion Calculator
- Monthly Pro Access$3.991 Month
- Pro Access$19.991 Year
- Lifetime Pro Access$79.99
Questions
Is ClinicalKey free?
Is Opioid Conversion Calculator free?
Do ClinicalKey or Opioid Conversion Calculator have ads?
Which is updated more often, ClinicalKey or Opioid Conversion Calculator?
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