Interesting, I'm interested in something like this, but the page doesn't have much information. - What languages are supported? - How many voices are available? - Is it possible to use without a monthly subscription? I'd rather pay only based on my usage (I don't use it every month).

For my use case, I'd need access to a wide variety of languages, and ideally 5+ voices per language. I'm currently using Amazon Polly, but I wonder if there's something better now.