Apache cTAKES

What it is

Apache cTAKES is an open-source Natural Language Processing (NLP) platform specifically designed for extracting information from electronic health records (EHRs). It is built on the UIMA framework and utilizes machine learning models to perform tasks such as named entity recognition, temporal information extraction, and more. cTAKES is primarily implemented in Java and leverages the Unified Medical Language System (UMLS) for medical terminology. It is suitable for bioinformatics and clinical research applications.

Specialized focus on clinical text processing with integration of UMLS.

When it fits — and when it doesn’t

Known weaknesses

Each one links to the public issue, changelog or docs page it came from, where we have one.

1. 01

   Limited to Java

   Primarily implemented in Java

2. 02

   Complex setup

   Requires understanding of UIMA and medical terminologies

3. 03

   Small contributor base

   Only 7 contributors on GitHub

What it does well

• Specialized for clinical text

  Focus on EHRs and integration with UMLS

• Open-source and community-driven

  Licensed under Apache-2.0 and hosted on GitHub

• Comprehensive NLP capabilities

  Supports named entity recognition and temporal information extraction

Pricing

Free tier

Yes

Paid from

—

Model

N/A

Enterprise plan

No

Pricing last confirmed Sep 29, 2026.