--- title: openNLP Reviews meta_title: 'openNLP Reviews 2026: Details, Pricing, & Features | G2' meta_description: Filter 11 reviews by the users' company size, role or industry to find out how openNLP works for a business like yours. aggregate_rating: rating_value: 4.0 review_count: 11 scale: '5' date_modified: '2026-09-30' parent_category: name: Natural Language Processing (NLP) url: https://www.g2.com/categories/natural-language-processing-nlp ---

openNLP Reviews & Product Details

User Insights

Average based on 11 real user reviews.

MS
Mariana S.
Spanish Professor
Mid-Market (51-1000 emp.)
"Apache OpenNLP"
4.5/5
What do you like best about openNLP?

I like that it is a useful tool when we have a lot of documents in different languages and we need to detect the language in order to find appropriate translators in order to communicate with members of our community Review collected by and hosted on G2.com.

What do you dislike about openNLP?

What I like the most about Apache Open NLP is the language detection because it is very useful when trying to go over papers that are in different languages Review collected by and hosted on G2.com.

SJ
Saurabh J.
Print Server Manager
Mid-Market (51-1000 emp.)
"Has reduced bar for usable NLP applications"
5/5
What do you like best about openNLP?

We've tried to build production quality NLP applications for a long time, but never gotten anywhere. After switching to openNLP, we had a beta version ready in 3 weeks. It's great to use, easy to implement and the documentation available is amazing Review collected by and hosted on G2.com.

What do you dislike about openNLP?

I just wish that openNLP came out with more updated releases faster than their current release cycle. There have definitely been moments where I wished it was more up to date with the current state of the art Review collected by and hosted on G2.com.

RT
Riley T.
Warehouse Manager
Small-Business (50 or fewer emp.)
"Amazing communication software"
5/5
What do you like best about openNLP?

openNLP is a great software for companies and businesses that work with multiple languages. Its easy to translate, and dissect words and sentences to easily understand. Review collected by and hosted on G2.com.

What do you dislike about openNLP?

OpenNLP is a very useful software that i dont believe has many flaws. This software is very easy to use, and very useful for our business. Review collected by and hosted on G2.com.

Verified User in Higher Education
UH
Verified User in Higher Education
Enterprise (> 1000 emp.)
"A good tool for Text ML tasks"
4/5
What do you like best about openNLP?

Was working on a basic question-answering system using basic NLP methods compared to the Neural Nets. OpenNLP made my process much simpler with its wide variety of functions that are easy to use and when in trouble there is always an easily accessible documentation which is well written to cover almost all the possible general errors. Review collected by and hosted on G2.com.

What do you dislike about openNLP?

The NER Tagger and POS tagger are very different when compared to the other packages like spaCy and NLTK, which sometimes makes it harder to compare the outputs over certain categories. Review collected by and hosted on G2.com.

Verified User in Computer Software
UC
Verified User in Computer Software
Small-Business (50 or fewer emp.)
"Great Open Source Natural Language Processing Library"
5/5
What do you like best about openNLP?

It has really good documentation. Apart from stemming, tokenization and lemmatization there are features like sentence detection, language detection. Review collected by and hosted on G2.com.

What do you dislike about openNLP?

It is not yet very widely used so there are very few resources for using it in Python yet. Review collected by and hosted on G2.com.

Verified User in Oil & Energy
UO
Verified User in Oil & Energy
Small-Business (50 or fewer emp.)
"Great for NLP"
3.5/5
What do you like best about openNLP?

Supports main NLP tasks such as tokenization and parsing etc. Easy to build something fast and especially easy to install. Documentation is fair. Review collected by and hosted on G2.com.

What do you dislike about openNLP?

I would definitely go with Spacy as it is more production focused and some of the tools of OpenNLP are not the most advanced. However, it is not so deep as NLTK and its API is not my favorite. Review collected by and hosted on G2.com.

Verified User in Printing
AP
Verified User in Printing
Enterprise (> 1000 emp.)
"Good library but not the best"
3/5
What do you like best about openNLP?

The truth that everything it promises meets, such as tokenization, sentence segmentation, part-of-speech tagging, named entity extraction, chunking, parsing, language detection and coreference resolution. Review collected by and hosted on G2.com.

What do you dislike about openNLP?

Maybe the part of part-of-speech tagging or chunking and parsing it could be better. Review collected by and hosted on G2.com.

Verified User in Venture Capital & Private Equity
CV
Verified User in Venture Capital & Private Equity
Small-Business (50 or fewer emp.)
"openNLP Review"
4.5/5
What do you like best about openNLP?

out of the box entity recognition, tokenization, etc is great for projects Review collected by and hosted on G2.com.

What do you dislike about openNLP?

not much to dislike to be completely honest Review collected by and hosted on G2.com.

Verified User in Accounting
UA
Verified User in Accounting
Small-Business (50 or fewer emp.)
"Great for start ups"
2.5/5
What do you like best about openNLP?

The new language model, Moses format support and unit tests Review collected by and hosted on G2.com.

What do you dislike about openNLP?

Concurrency is she poor handling of xml parsers Review collected by and hosted on G2.com.

Verified User in Education Management
UE
Verified User in Education Management
Small-Business (50 or fewer emp.)
"Easy to use"
3.5/5
What do you like best about openNLP?

Advanced Features, Open Source Free Can build a full NLP Pipeline Review collected by and hosted on G2.com.

What do you dislike about openNLP?

With any of its features, it produces high accuracy but also at the same time has false negatives. Review collected by and hosted on G2.com.

Questions about openNLP? Ask real users or explore answers from the community

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GU
Guest User

What is openNLP used for?

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