@kevin
The FOSS finance tracking app Buckwheat was revolutionary for me. It's because it's so ridiculously quick and simple that even I don't put off using it. With the widget on the home screen, the results are so instant and visible that it actually keeps my finances and spending constantly top of mind.

Before, my bank accounts were a black box, I never really had a sense of, that I only opened to feel bad once a month or so.

This app saved me literally thousands of dollars of impulse buys.