Questions I didn't find answers to at a first glance: you're calling this "the most private personal finance app", and then mention e2ee, but there is no mention of why encryption is needed. Does the app offer sync across devices? Is there a mobile version? Can I use it offline or does it need to talk to a server?

I'd personally happily pay for a good offline only finance app, or one that uses iCloud app sync or whatever it's called, but I'd probably not pay for an excellent online only app.