Money Doesn’t Break Friendships. Unclear Money Does.

In shared households, small expenses often turn into coordination problems. Who paid? Who still owes? Did someone already buy detergent? In interviews with 9 people living in shared households, most described shared expense coordination as stressful and awkward.

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To address this, I designed a shared expense coordination system that improves shared financial visibility and reduces coordination friction between housemates.

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The problem was not splitting bills.

It was maintaining clear financial visibility across multiple housemates without creating friction.

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What Breaks in Shared Living

Our interviews revealed that the frustration was rarely about the amount of money. It was about the coordination.

• The Visibility gaps
• Responsibility ambiguity
• Mental load accumulation

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The breakdown did not happen at the moment of payment. It happened in the lack of shared clarity.

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The Challenge

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Not Another Bill Splitting App

Design a system that makes shared expenses transparent and effortless across multiple housemates.

• Reduce mental load.
• Eliminate ambiguity.
• Remove awkward reminders. </aside>

Design Principles

To address these behavioural breakdowns, we defined four guiding principles:

1. Make responsibility visible

   Every shared expense should have clear ownership and status.

2. Reduce coordination effort

   Tracking should require minimal input and minimal follow up.

3. Lower social friction

   The system should reduce the need for direct confrontation or repeated reminders.

4. Reframe the emotional experience

   Shared expense management should feel collaborative and reassuring, not tense or awkward.