Natural language processing (NLP) APIs are used to analyze and classify text much more efficiently and accurately than even humans could.
Sign up to MonkeyLearn and try our SaaS API for free, or check out our various plans – from team to business and one-off plans. When you’re ready to get started with NLP, APIs are extremely helpful to integrate natural language processing software into your existing systems and tools.
There are both open source and SaaS options depending on your needs, budget, and timeframe. Open source APIs are free and can be widely customized, but are best for companies with on-staff developers and high levels of machine learning experience.
SaaS APIs, on the other hand, can be implemented right away, often with just a few lines of code. You get quick and easy access to powerful pre-trained NLP software, and you can take it a step further by training tools to your specific needs.
The Best SaaS and Open Source APIs for NLP
Best SaaS APIs for NLP
Best for: Companies of any size that want easy API setup to access powerful pre-made and customizable NLP tools.
You can try out MonkeyLearn’s machine learning models for free to see how these NLP tools works:
And when you need to train your NLP models with industry-specific data and language, there are simple tutorials to set them up in just a few minutes.
Pricing: Compare plans and prices. Free plan available. Paid plans start at $299/month.
Google Cloud NLP
Best for: Companies that want a managed service and easy integration with Google Cloud Storage.
Google Cloud NLP offers pre-trained Natural Language APIs to set up their features into your pre-existing systems: sentiment analysis, entity analysis, entity sentiment analysis, content classification, and syntax analysis.
The APIs are designed for easy integration with Google apps and Google Cloud Storage – perfect for companies that already use Google systems heavily. And their AutoML allows users with little computer science experience to customize tools.
Pricing: Free plan available with overall pricing depending on use.
Best for: Companies that want to incorporate NLP into their proprietary apps and services.
AYLIEN has business solutions “built by developers, for developers,” as they say, designed for use within a company’s app or as part of their service.
Their APIs, available in seven languages, offer social media monitoring, brand analysis, document processing, and content tagging, among others, that use NLP to automate processes and save time. And their thorough documentation and online demos take the pain out of embedding your APIs.
Pricing: Depends on individual use.
Best for: Companies that want to create custom NLP models (sometimes with small data sets) or process text in multiple languages.
With the Natural Language Classifier API from IBM Watson, developers can create highly accurate custom labels and classifiers with small data sets and little machine learning experience.
The APIs are available in six coding languages and can perform NLP analysis in 13 human languages. They allow you to build, train, and manage your analysis with just a little code, and you can evaluate your results to continually improve your confidence scores.
Pricing: Try for free for 30 days with an IBM Cloud account. Pay-as-you-go plans and subscriptions are available with pricing depending on use.
Best for: Companies that want to classify text to the specific taxonomies of their field or industry.
MeaningCloud’s Text Classification API analyzes individual phrases, then evaluates how phrases relate to each other to assign a “global polarity value.”
Their statistical classifiers use sample text documents for categorization, then rule-based classifiers help refine the output. Based on previous outputs, they can even categorize documents when no example texts are available.
Their API is pre-trained for taxonomies, like IPTC, IAB, ICD-10, and Eurovoc, and can be easily molded for other industries. Their test console allows you to simply choose an input and configuration and see the results immediately.
Pricing: MeaningCloud offers a free plan, and paid plans start at $99/month.
Best for: Companies that need to analyze huge amounts of data and want high security.
The Semantria API from Lexalytics is highly scalable and can be built for any NLP scenario. They offer analysis in over 20 languages that can be customized without too much work.
But their Industry Packs are where they really shine – pre-built configurations for industry-specific language. They perform far above most other trained NLP models with much less labor to install, and you can add custom dictionaries and adjust them as needed.
Pricing: Free trial period, then priced depending on number of requests.
Best Open Source APIs for Natural Language Processing
All of the below are available in Python, the favored programming language for machine learning.
NLTK (Natural Language Toolkit)
Best for: Programmers that want a relatively easy start with NLP code.
NLTK is one of the most used open source platforms for programming with natural language data. The top of the website features “some simple things you can do with NLTK” with pretty short code to get you started. And there are a number of other places to find production-ready APIs to help you set up tools, like stemming and lemmatization, sentiment analysis, and named entity recognition.
It’s a great start to NLP, and resources like Natural Language Processing With Python, written by the creators of NLTK, can be extremely helpful. But it’s primarily used for research and education models, so it’s not the most practical for handling large amounts of data.
Best for: Developers that want high-performance NLP analysis.
SpaCy is an improvement on NLTK that is extremely fast and can handle huge amounts of data. It has become the open source tool of choice for professional-grade NLP.
The website offers a number of courses to help with setup, and the API is relatively easy to use for those with coding experience. It’s great for simple keyword extraction, building whole natural language understanding systems, or prepping text for deep learning.
Best for: Developers that want a user-friendly interface and functionality.
It’s a top choice among less-experienced coders for it’s clean and easy interface that still performs great, though it doesn’t go too far beyond the most common NLP tools.
Best for: Researchers and developers who want to perform multi-level and multi-language NLP.
Stanford CoreNLP can run a tool pipeline on text with just a couple lines of code and offers a single option to change tools. It also provides an annotator pipeline to include additional outside annotators.
CoreNLP works in seven human languages, so it can be great for language research, machine translation, and news analysis.
Best for: Developers that primarily want to perform document comparison NLP tasks.
Gensim is particularly specialized to topic modeling, document indexing, and similarity retrieval, so if you want to do much beyond this, you’ll need to combine it with other libraries.
It does, however, perform very fast in Python thanks to its use of incremental online algorithms, data streaming, and low-level BLAS libraries.
Gensim is mostly used for document research–searching for similarities within hundreds of thousands of documents–and is common in medicine, insurance, patent research, and fraud detection.
Natural language processing can save time and money and perform tasks automatically that you may have never thought possible.
And there is certainly a lot to take in from the world of NLP APIs. However, whether you’re an experienced coder, or just want to copy and paste a few lines of code, there’s something available for every skill level.
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