I want furigana on display glasses, like Even Realities. Since the application would know my vocabulary, it can show just the words that I'm not likely to know.

Assuming you could hint the furigana from the application, the phonetic transcript would make it more accurate.

nice, we could do a lithuanian stress font this way too

This could be really useful as a decoding tool when you don’t know the kanji

If you want to make romaji, I built Pingtype:

https://pingtype.github.io/japanese.html

It also supports line breaking, so that words don't get cut in half when wrapping text.

This is cool!

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> javascript is required ... due to browser limitations

confusing when you don't explain which limktations this is