What Are the Best Budgeting Apps

I’m looking specifically for experts in the finance field who can distinguish between the various apps for budgeting (debt relief apps, tax relief apps). Other questions I’d like answered are: What is your preferred tax relief/debt relief/budgeting app? Which is the most popular? Why do people prefer one app over the other? What’s the number one reason people get into debt trouble. I would also welcome any debt relief anecdotes you might have. Please respond as to whether or not you are open to back-and-forth guest blogging opportunities. Requirements: Finance Expert (specifically in Tax Relief or Debt Relief). Preferably with some expertise in debt or tax law.