I was pretty excited to see a Norwegian flag on there, as not only do I sometimes not understand numbers, but there are a few different ways to say larger numbers. Click on the link and it is unavailable. I was sorely disappointed.
Hm, I'll look into it. Right now it is using the built-in SpeechSynthesis library in the browser. You may try installing the language in the accessibility settings for your OS. (Could you try this and let me know?)
I've considered adding a fallback API like Google's Cloud API if the browser is unavailable, but I haven't done that yet.
If you didn't, be sure to get on the feedback/email list and I'll let you know when I do.
Worked on Firefox on a Mac, but not on Firefox on Android.
I get about 40% correct in Norwegian, even though I've never studied the language before, since I'm studying Danish. I only get about 50% right in Danish :-(
"tre hundrede seks og halvfjerds"... mad! ("Three hundreds six and half-the-fourth-[multiple-of-twenty]", more-or-less.)
