Microsoft Azure Cognitive Service Text Analytics API detect sentiment, key phrases, topics, and language from your text. For Sentiment Analysis, the API returns a numeric score between 0 and 1. Scores close to 1 indicate positive sentiment and scores close to 0 indicate negative sentiment. Sentiment score is generated using classification techniques. The input features of the classifier include n-grams, features generated from part-of-speech tags, and word embeddings. English, French, Spanish and Portuguese text are supported.

For Key phrase extraction the API returns a list of strings denoting the key talking points in [...]

indico provides developer-friendly tools and APIs that turn raw text and image data into human insight.Sentiment Analysis API takes a sample of text (tweet, article, email, forum post, report, etc) and returns the positivity. For example, the text of a 5 star review is positive, while the text of a 1 star review is negative.Keyword Extraction API parses text to find the most important words that have been used. For example, within the sentence “Boston can get very cold during the winter”, this API will tell you that the words “Boston”, “cold”, and “winter” are the most important words in the sentence.