[mattsears]

BudgetDuo is a joy to use and that's the key. Sure, you can make Facebook clone on google sheets, but no one will use it. It's not convenient fiction at all, it's much much easier to swipe and tap on a mobile app than to do work on a spreadsheet - who want's to do that?

[mlthoughts2018]

Huh? After visiting the BudgetDuo site, I’d definitely say that a traditional spreadsheet is easier and more organized.

Even more important is that I know my data would remain private and I would not have to trust a third party like BudgetDuo to be a safe steward of any of the data about shared expenses.

[mattsears]

Huh? You're in the minority here if you're saying that people would rather use a spreadsheet than web/mobile app. How can more than one person see or update their shared expenses if the Excel spreadsheet resides on your partner's computer? That doesn't sound easy to me.