Speaking of expense trackers, it's probably something similar to to-do lists: there are tons of them, and they all just don't feel right, so of course I made my own a few years ago (pre-LLM). I was procrastinating for a few years and never made it into a real product, and then Claude and Codex made me stop even thinking about it, because why bother.
I made it because I wanted something really quick to use, and thought other people might want that too without building it themselves.
What did your own tracker do better than the apps you tried?