Tone Analyzer

Understand tone and style in written text

General Availability

Tone Analyzer uses linguistic analysis to detect three types of tones in written text: emotions, social tendencies, and writing style. Use the Tone Analyzer service to understand emotional context of conversations and communications. Use this insight to respond in an appropriate manner.

Developer tools


Standard Service


First thousand API calls per month are FREE. Additional 1 - 250,000 calls are $0.0088 per call, 250,001 - 5,000,000 calls are $0.0013 per call, 5,000,000+ calls are $0.0008 per call.

Includes full tone analysis of your content.


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Watson Premium plans offer a higher level of security and isolation to help customers with sensitive data requirements.

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Ready to use?


Getting started is easy! Try out the service on Bluemix now.

Use In Bluemix


Ready to get down to the details? Full documentation detailing how to get started using this Service in Bluemix is available for each Watson service.

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Localized versions of Watson services (Natural Language Classifier, Retrieve and Rank, Speech to Text, Text to Speech) are available in the following places.

Japanese - SoftBank