The most effective debt tracking system is the one you actually use. Both apps and spreadsheets have genuine advantages and real drawbacks. Here's an honest comparison.
The Case for Spreadsheets
Spreadsheets offer complete customization. You can build exactly the view that's meaningful to you — payoff order, monthly payment schedule, projected debt-free dates, total interest calculations. For people who are comfortable with numbers and like building their own systems, a spreadsheet creates ownership and engagement.
They're also free, accessible everywhere, and don't depend on a company staying in business or an app remaining available. Many people who successfully pay off large amounts of debt use nothing more than a Google Sheet they built themselves.
The Case for Apps
Apps provide structure without the setup. They handle the amortization math automatically, visualize progress, and often provide motivational features — streaks, milestone notifications, projected payoff dates that update in real time. For people who don't want to build a system but want to use one, an app is faster to start and often more engaging over time.
Apps also tend to be more portable and accessible — most people have their phone with them; they don't always have their spreadsheet open.
The Hybrid Approach
Some people use a spreadsheet for planning (building the payoff schedule, calculating order) and an app for tracking (logging payments, monitoring progress). The spreadsheet is the strategy; the app is the accountability.
What Matters Most
Whatever you choose, the critical feature is: does it show you your debt-free date, and does that date update when you make payments or add extra money? A system that produces a specific, moving date is infinitely more motivating than one that just shows you a diminishing balance. The date is the goal. Make it visible.