# ONCOassist vs ClinicalKey

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.

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.

## The numbers

| Metric | ONCOassist | ClinicalKey |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (116 ratings)](https://appshunter.io/ios/app/oncoassist/id558299114/reviews)** | — |
| Number of ratings | **116** | — |
| Positive reviews | **100.0% of reviews** | 8.8% of reviews |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 10 days** | Every 5 weeks |
| Monetization | **Free with in-app purchases** | Subscription |
| Size | 244 MB | 68 MB |
| Requires iOS | 15.6 | **15.5** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | +12 |
| Developer | [Portable Medical Technology Ltd](https://appshunter.io/developer/558299117) | [Elsevier Inc.](https://appshunter.io/developer/367031326) |

## What reviewers say

### ONCOassist

[App page](https://appshunter.io/ios/app/oncoassist/id558299114)

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.

**Highlights:** NCCN Treatment Protocols, Adjuvant Survival Rate Calculators, Medical Formula Calculators, CTCAE Toxicity Criteria, AJCC TNM Staging, Prognostic Scores, Oncology Drug Information, Drug Interaction Checker

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 👍 Extremely helpful app
- 👍 Very practical and useful
- 👍 Great resource for building plans
- 👍 Up-to-date information
- 👍 Life saver for clinical research

**What reviewers complain about**

- 💡 Would be better if Radiation oncology topics were included
- 💡 Would be convenient if there was an option in Spanish
- 💡 Please add Russian language

**Requested features**

- Radiation oncology topics
- Option in Spanish
- Russian language


### ClinicalKey

[App page](https://appshunter.io/ios/app/clinicalkey/id1041998175)

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.

**Highlights:** 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

**In-app purchases:** none

**What reviewers like**

- 📚 High-quality, evidence-based clinical content
- 🎯 Intuitive interface and quick reference format
- 🔍 Similar functionality to website version
- 👍 Browse feature restoration appreciated by users

**What reviewers complain about**

- 🔓 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

**Reported bugs**

- 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

**Requested features**

- 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


## Frequently asked questions

### Is ONCOassist free?

ONCOassist is free to download, with no in-app purchases.

### Is ClinicalKey free?

ClinicalKey is free to download, with no in-app purchases.

### Do ONCOassist or ClinicalKey have ads?

ONCOassist shows ads; ClinicalKey does not.

### Which is updated more often, ONCOassist or ClinicalKey?

ONCOassist ships an update every 10 days, and ClinicalKey every 5 weeks. Most recently, ONCOassist was updated on November 1, 2026 and ClinicalKey on November 4, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*