The idea was a single page a team could glance at to see what the current tasks or priorities are. There may also have been an activity stream for individuals' updates, though I don't recall for sure.
This was not a full project collaboration tool like http://www.nozbe.com, and far simpler than even https://taskant.com/.
It was more like a pinboard of note cards of what a team should be working on.
The minimum viable product aspect and black background stuck with me, but I can't recall the name or even search terms to look for it.
Any ideas what web app I'm thinking of?