I created something similar to this a while ago, but perhaps significantly more niche.
I like reading classical Dari poetry, but I'm not a native speaker. Every now and then, I read a couplet which has a word that I don't know, or that the dictionaries available to me (either from Iran or Afghanistan) don't provide clear explanations for.
I indexed a whole bunch of works from classical poets from across Central Asia, South Asia and the Middle East and created https://baytyab.com/ which lets me put in one of those words that I've come across, and see other couplets that the word has been used in to help me get a better, contextual understanding of its meaning(s) and usage(s).