Top Free Sentiment Analysis tools, APIs, and Open Source models

Top Free Sentiment Analysis tools, APIs, and Open Source models

What is Sentiment Analysis API?

Sentiment analysis, or opinion mining, is a technique used in natural language processing (NLP) to identify the sentiment or emotional tone expressed in a piece of text, including tweets, customer reviews, and news articles.

The Sentiment Analysis API accepts text as input and provides an analysis of the sentiment in the output. The API uses machine learning algorithms and linguistic analysis to classify the sentiment as positive, negative, or neutral. Some sophisticated APIs are capable of providing sentiment intensity scores or fine-grained sentiment analysis, which capture subtle nuances in expressed emotions.

Top Open Source (Free) Sentiment Analysis models on the market

For users seeking a cost-effective engine, opting for an open-source model is the recommended choice. Here is the list of the best Sentiment Analysis Open Source Models:

1‍. vaderSentiment

VADER (Valence Aware Dictionary and sentiment Reasoner) is a lexicon and rule-based sentiment analysis tool that is specifically attuned to sentiments expressed in social media.

2. TextBlob

TextBlob is a Python (2 and 3) library for processing textual data. It provides a simple API for diving into common natural language processing (NLP) tasks such as part-of-speech tagging, noun phrase extraction, sentiment analysis, classification, translation, and more.

3. pattern

Pattern is a Python Web mining module, equipped with resources for natural language processing, machine learning, and network analysis. It also offers a sentiment analysis module.

4. CoreNLP

Stanford CoreNLP offers a range of language analysis tools written in Java. It can process unprocessed human language input and provide the fundamental word forms and their corresponding parts of speech, along with detecting proper nouns such as company and personal names.

Cons of Using Open Source AI models

‍While open source models offer many advantages, they also come with some potential drawbacks and challenges. Here are some cons of using open source models:

  • Not Entirely Cost Free: Open-source models, while providing valuable resources to users, may not always be entirely free of cost. Users often need to bear expenses related to hosting and server usage, especially when dealing with large or resource-intensive data sets.
  • Lack of Support: Open source models may not have official support channels or dedicated customer support teams. If you encounter issues or need assistance, you might have to rely on community forums or the goodwill of volunteers, which can be less reliable than commercial support.
  • Limited Documentation: Some open source models may have incomplete or poorly maintained documentation. This can make it difficult for developers to understand how to use the model effectively, leading to frustration and wasted time.
  • Security Concerns: Security vulnerabilities can exist in open source models, and it may take longer for these issues to be addressed compared to commercially supported models. Users of open source models may need to monitor for security updates and patches actively.
  • Scalability and Performance: Open source models may not be as optimized for performance and scalability as commercial models. If your application requires high performance or needs to handle a large number of requests, you may need to invest more time in optimization.

Why choose Eden AI?

Given the potential costs and challenges related to open-source models, one cost-effective solution is to use APIs. Eden AI smoothens the incorporation and implementation of AI technologies with its API, connecting to multiple AI engines.

Eden AI presents a broad range of AI APIs on its platform, customized to suit your specific needs and financial limitations. These technologies include data parsing, language identification, sentiment analysis, logo recognition, question answering, data anonymization, speech recognition, and numerous other capabilities.

To get started, we offer free $10 credits for you to explore our APIs. 60720 (1).png

Access Sentiment Analysis providers with one API

Our standardized API enables you to integrate Sentiment Analysis APIs into your system with ease by utilizing various providers on Eden AI. Here is the list (in alphabetical order):

  • AWS
  • Connexun
  • Emvista
  • Google Cloud
  • IBM
  • Lettria
  • Microsoft Azure
  • NLP Cloud
  • OpenAI
  • Sapling
  • Tenstorrent

1. Amazon- Available on Eden AI

Amazon Comprehend provides a sophisticated API for sentiment analysis. This tool allows users to determine the sentiment of text documents in multiple languages with accurate sentiment classification and support for positive, negative, mixed, and neutral sentiments. DetectSentiment, BatchDetectSentiment, and StartSentimentDetectionJob are among the operations provided by the API, which delivers sentiment scores to assess accuracy.

2. Connexun- Available on Eden AI

Leveraging cutting-edge techniques in text vectorization and machine learning classification, Connexun offers precise sentiment analysis for text in multiple languages. What distinguishes Connexun is its exceptional ability to assess sentiment within the context of entities. With their models trained on rigorously labeled datasets, Connexun guarantees to provide reliable, high-quality results.

3. Emvista- Available on Eden AI

Emvista presents a robust API for sentiment analysis, boasting high accuracy and explainability. Additionally, Emvista offers a user-friendly web solution named Text Radioscope that provides seamless integration with different sources of textual information such as Twitter, ZenDesk support tickets, and email inboxes.

Through presenting keyword, concept, opinion, and emotion data as curves, histograms, and word clouds, Text Radioscope provides a means for users to extract significant insights from text data. This methodology facilitates the discovery of valuable knowledge, particularly when comparing large datasets.

4. Google Cloud- Available on Eden AI

With the assistance of Google Cloud's Sentiment Analysis tool, individuals can analyze textual data and accurately determine its predominant emotional sentiment, be it positive, negative or neutral. This API's robustness and accuracy distinguish it from other options, enabling businesses to obtain in-depth insights into the emotions conveyed in their textual data.

By utilizing Google's advanced infrastructure and up-to-date algorithms, individuals can exercise informed decision-making based on a lucid comprehension of the expressed sentiment in their writing. This forms the basis for elevated consumer contentment, successful brand administration, and more effective decision-making schemes.

5. IBM- Available on Eden AI

IBM provides an all-encompassing sentiment analysis API via its Watson NLP platform. The development and deployment process for sentiment analysis projects is streamlined by IBM Watson NLP through its standardized framework for NLP, document comprehension, and translation.

The employment of multiple disparate tools is no longer necessary, ensuring the uniformity of the analysis pipeline. Whether using pre-trained models or refining a sentiment analysis model with the watson_nlp library, IBM Watson enables companies to acquire valuable insights from textual data and comprehensively understand customer opinion or market sentiment.

6. Lettria- Available on Eden AI

Lettria's API utilizes psychology-based resources and Plutchik's model of emotions for a comprehensive analysis of customer sentiment. By categorizing effects into eight primary categories - joy, sadness, fear, anger, disgust, attraction, surprise, and anticipation - businesses can gain insight into exact customer emotions related to their products or services, even when dealing with multiple emotions at once.

Lettria's API can automatically redirect pertinent reviews to the relevant departments to enable prompt redress, thereby guaranteeing efficient customer support and issue resolution. Moreover, tracking trends and visualizing review data on specific aspects empowers businesses to gain invaluable insights and make informed decisions.

7. Microsoft Azure- Available on Eden AI

Microsoft Azure offers a robust API through its Cognitive Service for Language. The sentiment analysis and opinion mining capabilities exceed basic sentiment labels by detecting hints of positive or negative sentiment and connecting them to specific elements of the text.

Azure supports a wide range of written languages and provides sentiment labels and confidence scores for both sentences and documents, enabling businesses to comprehend both the general and specific sentiments expressed. Additionally, opinion mining enhances the understanding of opinions attached to individual attributes or words in the text.

8. NLP Cloud- Available on Eden AI

NLP Cloud provides a comprehensive API that includes emotion analysis functionality. The API offers out-of-the-box sentiment and emotion analysis based on powerful models such as GPT-J, GPT-NeoX, and Dolphin, which deliver reliable results with impressive accuracy.

NLP Cloud also allows users to choose between pre-trained models or training on their own, providing flexibility and customization options. With a focus on dependability, NLP Cloud guarantees swift response times and allows for local testing of sentiment and emotion analysis prior to deployment in production.

9. OpenAI- Available on Eden AI

Powered by OpenAI's cutting-edge language models, the API presents various advantages. A key benefit is the capacity to comprehend and interpret context, leading to deeper analysis and understanding.

OpenAI's solution furthermore performs exceptionally well in processing intricate and nuanced emotions, resulting in more sophisticated outcomes. Additionally, the API offers a high level of flexibility and customization, empowering developers to fine-tune the sentiment analysis model to fit specific use cases.

10. Sapling- Available on Eden AI

Sapling's sentiment analysis tool assesses the sentiment of a provided text, identifying whether it is positive, negative, or neutral. It also breaks down the sentiment of each sentence for a more detailed analysis.

11. Tenstorrent- Available on Eden AI

By utilizing their sophisticated AI computing solutions, Tenstorrent provides highly effective and adaptable algorithms for sentiment analysis that deliver remarkable precision and performance. Their NLP solution excels at understanding the subtle intricacies of human sentiment, capturing the detailed nuances and emotional subtext conveyed in text data. "With advanced technology, Tenstorrent's Sentiment Analysis enables businesses and developers to swiftly and accurately extract valuable insights from large volumes of text data.”

Pricing Structure for Sentiment Analysis API Providers

Eden AI offers a user-friendly platform for evaluating pricing information from diverse API providers and monitoring price changes over time. As a result, keeping up-to-date with the latest pricing is crucial. The pricing chart below outlines the rates for smaller quantities for November 2023, as well as you can get discounts for potentially large volumes.

How Eden AI can help you?

Eden AI is the future of AI usage in companies: our app allows you to call multiple AI APIs.
  • Centralized and fully monitored billing on Eden AI for Sentiment Analysis APIs
  • Unified API for all providers: simple and standard to use, quick switch between providers, access to the specific features of each provider
  • Standardized response format: the JSON output format is the same for all suppliers thanks to Eden AI's standardization work. The response elements are also standardized thanks to Eden AI's powerful matching algorithms.
  • The best Artificial Intelligence APIs in the market are available: big cloud providers (Google, AWS, Microsoft, and more specialized engines)
  • Data protection: Eden AI will not store or use any data. Possibility to filter to use only GDPR engines.

You can see Eden AI documentation here.

Next step in your project

The Eden AI team can help you with your Sentiment Analysis integration project. This can be done by :

  • Organizing a product demo and a discussion to understand your needs better. You can book a time slot on this link: Contact
  • By testing the public version of Eden AI for free: however, not all providers are available on this version. Some are only available on the Enterprise version.
  • By benefiting from the support and advice of a team of experts to find the optimal combination of providers according to the specifics of your needs
  • Having the possibility to integrate on a third-party platform: we can quickly develop connectors.

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