I'm 40% through getting my first 100 users for https://www.kruh.ltd. So far, I've only added a "banner" announcement on two of my products and mentioned it at the bottom of newsletters to their subscribers. It's taken a couple of months to get this far. I will probably launch in two phases of cohorts. I.e. in blocks of 50.
It also means circle in Czech and sounds like crew. When I happened upon the word, I was very proud of myself! I'm usually not great at naming projects.
