TinyGem Listen is similar, has speed control and different voice quality.

https://tinygem.org/listen

Curious if you like it. It (TinyGem) has been a passion project of mine for a while now.

Just tried this on https://craftinginterpreters.com/a-map-of-the-territory.html and I'm getting weird pauses in the middle of sentences

Know what it is (sometimes text parses with extra spaces causing pauses). Will fix soon.

I do not think extra spaces are the issue (since there aren't any in the link). I suspect it is converting fix chunk of words into audio and before the next chunk there is an awkward pause. Still, very soothing and natural voice.

Seems like that uses azure text to speech, right?

On Chrome: right click on the audio player and "Download audio as..."?

A download option could lead to copyright violation claims.

That makes zero sense. It is already being downloaded to the browser.

You mean into the local cache like youtube videos? Try making a youtube to mp3 site and wait for the content industry to recognize it.

Also, if you don't do anything with it afterwards, what kind of claims does anyone have?

Right?! This is honestly a service I would pay for and it’s… up for free?

There must be some type of cost on their end. Heck I’m happy to invest!

I explained in my comment here on how I achieved something very similar for free in my android app:

https://news.ycombinator.com/item?id=28176237

Not trying to steal from the dev here, but this same ability is built into Pocket that is run by Mozilla, and Mozilla will happily take your money.