In 2007 it was $25: https://web.archive.org/web/20070202002238/https://www.hogba... (and crikey wasn't design beautiful back then? Look at that snapshot of web design history.)
That same $25 would, calculated by inflation, cost $35 now. Which is the price of this app, Bike.
UI, UX, websites, software -- it was a good time and we've lost a lot.
I dig that it has AppleScript support, rare (and great!) to see a new app supporting that.
I am on 10.14 because there are some 32-bit apps I can't replace (either because there are no 64-bit versions, for instance some old emulators, or because there are but they cost money, or there are but they have other changes which I don't like. MS Office is an example of both of the latter.
It does work, but it's a little clunky IMHO. For instance, if you press Return in the middle of a line, I expect it to split the current paragraph into 2, but not in OutlineEdit (or Outlinely or OmniOutline).