Product
Mono Bank
·
2024
A calmer way to split expenses
Designing shared accounts and expense splitting for a challenger bank, from research to launch in four markets.
Role
Senior product designer (contract)
Duration
9 months
Team
3 designers, 12 engineers, 2 PMs
Outcome
220,000 shared spaces created in the first quarter
This case study is protected because the work was done under an NDA. The password is in my CV, or ask me for it.
Context
Mono Bank wanted to let couples, flatmates and friends share money without opening a joint account. The feature had to work across four countries with different rules about shared liability.
Approach
We ran diary studies with 24 households, then prototyped three models: a shared pot, mirrored accounts and a running tally. The running tally won on clarity and lost on control, so we combined it with spending limits per member.
Highlights
A ledger that reads like a conversation, not a statement.
Settling up in one tap, with the maths explained on request.
Rules that adapt to the country of each member.
Outcome
220,000 shared spaces were created in the first quarter after launch, with a 4.7 average rating for the feature in app store reviews mentioning it.