Flat Power Calculator
The flat power bill, minus the server's share, split five ways. The person whose machine runs all day pays for it.
Independent development. TypeScript calculation, formatting and Home Assistant integration.
Enter the bill, the period and the rate, and the app reads the server's kWh for that period from Home Assistant and turns it into a cost. The calculation is separate from the formatting, so the same numbers produce both the breakdown and the message that gets pasted into the flat chat.
TypeScript and Vite, no backend, and no tests yet.
State
A small tool that does one calculation and explains it. It ran on my machine for the flat and that was enough.