Yep, the same one. You probably heard of us from our Show HN, [1] which I later found out was the 9th-most-popular Show HN, by upvote count. It really gave us a boost, and led to a flurry of media coverage!
We still have our browser plugins for web [2] and PDF, [3] but are now also integrated into education platforms, [4] and even some news websites. [5]
I've been bootstrapping it (and raising a family) so growth has not been as meteoric as some other startups, but it's been consistently up-and-to-the-right!
If there's ever a platform you'd like to see us work with, just let us know and we'll get on it.