Text to Speech API by Listnr. Adding text to speech capabilities to your apps has never been easier! Listnrs' TTS API offers over 600 voices in 80 different languages, users can access all our Standard and Premium voices programmatically.
I'm currently using this API in my mobile app and I really like the results and the features. Pricing seems fair; however, I have had some issues with reliability. While it works most of the time, their platform seems to go down more often than I would like and there is often little to no communication from the company.
None-the-less, I will continue to use it as their huge library of languages and voices really puts them ahead of other such services.
