Pennies - Incredibly simple personal budgeting app for iOS
Lunch Money - A personal budgeting tool with multi-currency support
Unspent - Track your spending money. Keep it simple.
Actual Budget - Robust and simple budgeting that works
Budgy 2 - Your best free budget assistant on the go
Wallet - Wallet is the simplest and easiest way to keep track of and secure your most sensitive information.