Text-to-speech gem based using Azure Cognitive Speech Services.

Status: alpha (has just some basic testing)


Add this line to your application's Gemfile:

gem 'azure-tts'

And then execute:

$ bundle

Or install it yourself as:

$ gem install azure-tts


Obtain a Cognitive Services Subscription key (get a trial one here). Read more about the Cognitive Services TTS here.

Azure::TTS.configure do |config|
  config.region = "eastus"
  config.api_key = "YOUR_SUBSCRIPTION_KEY"

Azure::TTS.voices # => returns a list of voices available in the region

Azure::TTS.(text: "Hello world!", locale: "en_US", gender: :female, neural: true)
Azure::TTS.(text: "Hello world!", locale: "en_US", gender: :female)
Azure::TTS.(text: "Hello world!", locale: "en_US", format: :audio_24khz_160kbitrate_mono_mp3)

Note: see constants.rb for available formats.


After checking out the repo, run bin/setup to install dependencies. Then, run rake test to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to


Bug reports and pull requests are welcome on GitHub at


The gem is available as open source under the terms of the MIT License.