PuzzleBeat is a daily puzzle habit. roughly.is belongs next to that habit: it is a family of daily estimation games, run by an independent developer.
You already come here for a new puzzle each day. roughly.is is daily in that same sense, and the games are estimation games. Estimation means judging a quantity and settling on an answer. That is a different daily task from the puzzles on this site, so it sits beside PuzzleBeat rather than inside it. The site is that family of games, and an independent developer runs it.
This page is a short introduction for people who already play here. A daily game from another independent developer is a natural fit when a daily puzzle is already part of your day. Open the link in a new tab, then come back to today's puzzles when you are done.