Fair Rent Split
“One bedroom is bigger — how much more should they pay?”
Everyone says privately what each room is worth to them, and this finds prices where nobody would rather have somebody else's room at somebody else's price. That's a real mathematical property, not a figure of speech — and it shows you the check.
- Tries every way of handing out the rooms and picks the one that makes everyone happiest
- Then solves for prices nobody envies, which is a shortest-path problem underneath
- Shows the test: for each person, would they swap, and by how much
- Handles up to eight rooms, and says so honestly when the numbers make it impossible
- Because square footage was never what anybody actually cared about
- This one is finished and tested — not on the build list
- It will be $9, same as every other tool
- One email when it goes up, no list, no spam
Three steps, then you're done
Then everyone splits the whole rent across them, privately.
The assignment and the prices come out together.
Every person, against every other room, shown on screen.
Questions
Do I need to install anything?
No. Each tool is a single file. Double-click it and it opens in Chrome, Edge, Safari or Firefox — whichever you already have. No account, no password, no software.
Does anything get uploaded?
No. Your numbers and files never leave your computer — the tools have no way to send them and no internet connection is needed to run them. You can switch your wi-fi off and they still work.
I'm not good with computers. Is this too hard?
The first thing every tool does is walk you through it in five short screens with pictures. Then there's a button that fills it with example numbers so you can watch it work before touching anything.
Will it work on my phone?
Yes. Email yourself the file and open the attachment, or drop the files in iCloud Drive, Dropbox or Google Drive and open them from there — then they're on every device you own.