I have looked into other sources. From what I've gathered so far, the best thing I could do is to pick a very prominent dictionary format that many other format

I have looked into other sources. From what I've gathered so far, the best thing I could do is to pick a very prominent dictionary format that many other formats can convert into with existing open source tools. Then, I would let users import their custom dictionaries themselves. This would reduce maintenance on my part while ensuring very broad support for a lot of languages. I'm thinking that a format like DSL should work out. Beyond my plans for more language support, I also want to extend the tap to select functionality to the other CJK languages, so I've been looking at text segmentation libraries I could port to Dart for Chinese and Korean. Otherwise, drag to search should work out for most languages, though a lack of deconjugation would get in the way. Jisho.org's deconjugation is why I query their site for definitions rather than just use their data sources -- I actually have a Chinese-English branch already working by scraping MDBG, but the owner explicitly disallows any scripted use of the site, so I can't release it. I really wish the websites for other languages were as scrape friendly.