ONCOassist vs ClinicalKey
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ONCOassist
This app provides oncology professionals with a comprehensive suite of decision-support tools. It offers access to treatment protocols, survival rates, medical calculators, toxicity criteria, staging information, drug details, and news, all designed to aid in patient care and save time.
- NCCN Treatment Protocols
- Adjuvant Survival Rate Calculators
- Medical Formula Calculators
- CTCAE Toxicity Criteria
- AJCC TNM Staging
- Prognostic Scores
- Oncology Drug Information
- Drug Interaction Checker
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Please note: This application, as a decision-support aid, is to be used by a practicing healthcare professional(“HCP”) and does not replace clinical judgement. It is not designed for use by patients and does not replace the advice of a doctor. ONCOassist is a comprehensive suite of decision support tools developed by oncology professionals, for oncology professionals. It includes a range of breakthrough tools designed to manage patient care effectively. Let's take a closer look at some of the features available: • NCCN Treatment Protocols: Developed in collaboration with the NCCN, this tool provides information on regimens taken from the NCCN template database. • Adjuvant Tools: These tools offer 5 and 10-year overall survival rates for patients with and without chemotherapy in an adjuvant setting. Breast cancer, colon cancer, and GIST tools are among the many adjuvant decision support tools available. • Useful formulas: Body Surface Area, Chemotherapy Dose Calculator, QTc, ECOG Performance Score, Khorana Score, MASCC Risk Index, and many more are included. These calculators simplify medical calculations and include frequently needed conversions and dosage calculations. • Common Toxicity Criteria for Adverse Events (CTCAE v4.0 & 5.0): This tool provides a standardized classification of adverse effects of drugs used in cancer therapy. CTCAE versions 5.0 and 4.0 are available in an easy-to-use and interactive format. • AJCC TNM staging: The tool provides criteria for every malignancy and includes the AJCC 7th, 8th, and 9th edition staging criteria. • Prognostic Scores: This tool offers over 17 prognostic scores for a range of specialties. It helps with prognostication, risk stratification, and determining eligibility for specific treatments or clinical trials. • Drug info section: Over 200 oncology drugs are available in an easy-to-use and interactive format. • Drug interaction checker: This tool helps users quickly check for potential drug interactions. • IO toxicity management tool: This tool is designed to manage immune-related adverse events. • ONCOnews: From breaking news to in-depth analysis, ONCOnews brings together all oncology news sources in one place. • ONCOvideos: This offers access to the most recent videos from Oncology Spotlight, which provides insights into the experiences of oncology professionals. Additionally, users can watch OncoAlert and Oncology Brother videos. ONCOassist offers oncology professionals the following benefits: Saves Time Oncology professionals no longer waste time searching through the internet for safe validated information to aid them with their decision making, all of the tools and information they need is available within ONCOassist and is available without the need for internet access. Improves quality of care ONCOassist promotes the use of evidence-based medicine. It is also the only CE approved oncology app on the market. Helps Empower Patients Adjuvant decision support tools contain patient-friendly information to allow for a more collaborative decision-making process. Regularly updating ONCOassist will be updated regularly with new prognostic tools and calculators. We will listen to your feedback and update accordingly. Email us at any time using feedback@oncoassist.com. ONCOassist is regulated by the Irish Health Products Regulatory Authority and is CE marked for conformance as a medical device.
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.
Screenshots
Verdict
The clearest difference is review sentiment: ONCOassist at 100% against ClinicalKey's 9%. ONCOassist also leads on monetization model (free with in-app purchases vs subscription) and update cadence (every 10 days vs every 5 weeks). ClinicalKey's advantage is ads (none vs shown). On price, in-app purchases, device support and iOS requirement 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.
ONCOassist ships an update every 10 days, ClinicalKey every 5 weeks. The most recent releases landed on November 1, 2026 and November 4, 2026 respectively.
| Parameter | ONCOassist | ClinicalKey |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (116 ratings) — better | — |
| Positive reviews | 100.0% of reviews — better | 8.8% of reviews |
| Number of ratings | 116 — better | — |
| Update frequency | Every 10 days — better | Every 5 weeks |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Free with in-app purchases — better | Subscription |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 15.5 — better |
| Further details — not scored | ||
| Size | 244 MB | 68 MB |
| Age rating | 17+ | +12 |
| Developer | Portable Medical Technology Ltd | Elsevier Inc. |
Customer experience
ONCOassist
ClinicalKey
User reviews
ONCOassist
From 116 App Store ratingsWhat we love
- 👍 Extremely helpful app
- 👍 Very practical and useful
- 👍 Great resource for building plans
- 👍 Up-to-date information
- 👍 Life saver for clinical research
Room to improve
- 💡 Would be better if Radiation oncology topics were included
- 💡 Would be convenient if there was an option in Spanish
- 💡 Please add Russian language
ClinicalKey
From App Store reviewsWhat we love
- 📚 High-quality, evidence-based clinical content
- 🎯 Intuitive interface and quick reference format
- 🔍 Similar functionality to website version
- 👍 Browse feature restoration appreciated by users
Room to improve
- 🔓 Constant forced logout issues
- 🔐 Institutional login authentication failures
- ⏳ App freezes and perpetual loading screens
- 🚫 Missing textbook access in app vs website
- 📵 Frequent crashes and force closures
Bugs and requests
ONCOassist
Requested features
3 requests- Radiation oncology topics
- Option in Spanish
- Russian language
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
In-app purchases
ONCOassist
No in-app purchases
ClinicalKey
No in-app purchases









