Funny seeing this site here again!
I made WordSafety five years ago as a two-night quickie side project:
https://news.ycombinator.com/item?id=10117297
It is sadly neglected by me since then. Fortunately the code is extremely simple so it just runs with zero maintenance.
Actually I'd love to hand this site over to someone who would take better care of it than me. If that's you, drop me an email or Twitter DM (details in my HN bio).