Firefly III
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Firefly III is a free, open-source personal finance application you host on your own server. It tracks income, expenses, and transfers across multiple accounts with fine-grained categorization. The interface is clean and straightforward, making it simple to record transactions and set rules to automate regular categorizations.
The app appeals to privacy-conscious users and those who want complete control over their financial data. You'll find it particularly useful if you run your own server or have the technical skills to host it, as there's no managed service. Unlike proprietary tools, you can review the code and host everything behind your own security.