Amazon Polly vs Context.IO: What are the differences?

Developers describe Amazon Polly as "Text to Speech in 47 Voices and 24 Languages". Amazon Polly is a service that turns text into lifelike speech. Polly lets you create applications that talk, enabling you to build entirely new categories of speech-enabled products. Polly is an Amazon AI service that uses advanced deep learning technologies to synthesize speech that sounds like a human voice. On the other hand, Context.IO is detailed as "A REST email API that makes it easy and fast to integrate your user's email data in your application". As soon as a mailbox is connected, we create a metadata index of its content starting from the most recent emails which become available from the API within seconds. Context.IO takes care of synching email data for your app so you don't have to build, scale and maintain this infrastructure yourself. Focus on what's unique to your business, we'll manage the technical details of integrating with arcane email server protocols.

Amazon Polly belongs to "Text-To-Speech as a Service" category of the tech stack, while Context.IO can be primarily classified under "Email API".