# BCT Taxonomy vs ClinicalKey

The clearest difference is review sentiment: BCT Taxonomy at 100% against ClinicalKey's 9%. BCT Taxonomy also leads on monetization model (free vs subscription) and iOS requirement (11.0 vs 15.5). ClinicalKey's advantage is update cadence (every 5 weeks vs every 74 months). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

BCT Taxonomy ships an update every 74 months, ClinicalKey every 5 weeks. The most recent releases landed on October 26, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | BCT Taxonomy | ClinicalKey |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/bct-taxonomy/id871193535/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | **100.0% of reviews** | 8.8% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 74 months | **Every 5 weeks** |
| Monetization | **Free** | Subscription |
| Size | 10 MB | 68 MB |
| Requires iOS | **11.0** | 15.5 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [23 Ltd](https://appshunter.io/developer/577767595) | [Elsevier Inc.](https://appshunter.io/developer/367031326) |

## What reviewers say

### BCT Taxonomy

[App page](https://appshunter.io/ios/app/bct-taxonomy/id871193535)

This app provides a searchable database of 93 behavior change techniques, organized into 16 groups. It's a valuable resource for designing, reporting, or evaluating interventions aimed at modifying behavior.

**Highlights:** Full BCTTv1 access, Quick search by label or grouping, View all BCTs, Definitions and examples, Organized into 16 groupings

**Features:** Vision Pro support

**In-app purchases:** none


### 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 BCT Taxonomy free?

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

### Is ClinicalKey free?

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

### Do BCT Taxonomy or ClinicalKey have ads?

Neither BCT Taxonomy nor ClinicalKey shows ads.

### Which is updated more often, BCT Taxonomy or ClinicalKey?

BCT Taxonomy ships an update every 74 months, and ClinicalKey every 5 weeks. Most recently, BCT Taxonomy was updated on October 26, 2026 and ClinicalKey on October 29, 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.*