A good expense-splitting app solves one job well: add a bill, pick a split, see who owes whom, settle up. For that one job, plenty of tools already do it well.
The trouble starts with everything a plain expense tracker was never built for. Chores don't exist. Groceries don't exist. The running commentary of shared living ("locked out, spare key under the mat," "whose turn is bins") ends up back in a group chat that nobody can search. And a feature paywall on basics like itemized splits is a well-documented irritant for exactly the cost-sensitive renters who need it most.
The real question isn't whether a tool can split bills well, most modern tools clear that bar. It's whether it also handles the thing that actually causes flat-share friction: unequal effort. Money fights are visible and easy to point to. Chore fights are the quiet ones that build up until someone moves out.
That's the gap Roomailo is built to close: fair expense splitting, plus chore rotation with photo proof so "I did clean it" has evidence behind it, in the same app, without a paywall on the basics.