Build a transparent rent splitting app for flatmates
12/15The Opportunity
Flex app has 301-upvote complaint threads. A dead-simple rent tracker with WhatsApp reminders and no hidden fees wins on trust alone.
Original Signal
“My flatmate insists he paid his share of the WiFi bill but Splitwise just shows a balance, not what it was for. We're arguing about a spreadsheet at this point. I need receipts, not a number.”
Score Breakdown
12/15How urgently people need this solved and how willing they are to pay for it. Based on complaint frequency and spending signals across platforms.
How open the market is. A high score means few or no direct competitors, or existing solutions are overpriced and underdeliver.
How quickly a solo developer can ship an MVP. 5 = weekend project with standard tools. 1 = months of infrastructure work.
Existing Solutions
Splitwise is the category standard but it's opaque — balances accumulate with no clear audit trail, and roommates constantly dispute what counts as paid. Tricount is simpler but has the same problem: totals without transparency.
Willingness to Pay
Flatmates paying for shared expenses would pay $2–$5/mo each for an app that provides a clear, irrefutable audit trail of who paid what and when.
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