Simple is beautiful for budgeting. Every month I use their "goals" as budgets (Rent, recurring costs, motorcycle, day-to-day, insurance, etc.) and I set aside all the money I'm going to spend in each category for the month - and just mark the transactions from that goal. Makes it very easy to budget. There could be improvements - but this works wonderfully right now.

Simple is great but it's a bit confusing when looking at your balances. If you are just using the mobile app it's fine because it hides your stashes but the web app spills the beans when it tells you how much money you really have.