Ask HN: Text Editor Solo Project by Japanese Dev

I remember a cool text editor project - it was a solo dev project with a free trial and a small subscription after that.

I can't remember the name of it though (ink something?) and the keywords I can remember make it impossible to search for. It had a really nice design.

I recall it being on HN a while back.

Not sure if that's enough to go on, but does anyone know what I'm talking about?