"After I wrote my post about Apple's dictionary files, I got a mysterious email showing up in my inbox. The email was from someone who's spent some time writing code to do the same thing, but doesn't want to post it under his own name in case he falls fowl of his country's DMCA equivalent. Crazy. He said I could post his code under the condition that I took his name off it."

https://josephg.com/blog/apple-dictionaries-part-2/

Vocab adds a few other features such as adding new words, so it's a welcome addition to this space. It seems that most custom dictionaries use the Stardict format, so perhaps adding that file format would be a way to bring in more of the community.