Building
PotPlanner — a personal budgeting app built around the envelope method. You split your money into named "pots" (rent, food, fun, whatever), and you stop when a pot runs dry. Simple premise, surprisingly hard to stick to without the right tool.
I had a working version. Lost it entirely during an OS switch — a git mishap that I still think about. So I'm rebuilding from scratch. Slower this time. Better scaffolding. Fewer shortcuts I'll regret in six months.