Even isn't always fair
When one room is twice the size of another, or has its own bathroom, splitting the rent evenly means someone pays for space they never use. Quarters splits it in two parts: the shared spaces per person, because everyone uses the kitchen, and the rest by room size and what each room has. Change the shared part with the slider until everyone nods.
Questions
What's the fairest way to split rent?
Split the shared spaces (kitchen, living room, hallways) equally per person, because everyone uses them, and split the rest by bedroom size. Then add a premium for things like a private bathroom. Most people land on 30 to 50% for the shared part; 40% is a good start.
How much more should the room with an en suite pay?
A private bathroom usually adds about 20% to that room's weight, on top of any extra size. In a two-bedroom flat that tends to move the split from 50/50 to somewhere around 55/45 or 60/40.
How do we split rent with a couple in one room?
The couple's room pays its share by size like any other, and each of them pays a full per-person share of the shared spaces. Add a partner to a room and Quarters does both.
Do the amounts always add up to the rent?
Yes. Rounding is done so the parts add up exactly to the rent, to the whole unit or to the cent.
What about bills?
Add the monthly bills and they're split equally per person on top of the rent, since usage is hard to pin to one room.
Is it free? What do you store?
Free, no account. Your flat stays on this device and in the share link, so everyone can open the same split on their own phone.