GnuCash

GnuCash is a desktop application you install and run on your own computer, giving you full ownership of your financial data with no cloud storage and no subscription fees. It uses proper double-entry bookkeeping, the same method accountants and businesses use, which catches errors automatically and gives you a more complete picture of your finances. Multi-currency support is built in, making it practical for retirees with international investments, travel accounts, or family with money in different countries.

This option appeals to retirees with accounting knowledge or those who simply prefer not having their financial information on someone else's servers. The learning curve is steeper than app-based budgeters, and the interface feels less polished than modern mobile apps, but the accuracy and control make that trade-off worthwhile for detail-oriented people. It's free to use and has been around for decades, so you're not betting on a startup's survival.