I've built an expense tracker that is heavily privacy oriented. All your data is stored on your device, it works offline and you can also use it on multiple devices with real time sync (e2e encrypted).
Recently, I've implemented bunch of new features like detailed statistics and your custom defined categories. You can also export all your data in form of sqlite database whenever you want.
Have a look, you might find it useful. If you're missing a feature, let me know, I'll be happy to implement it!
lofextra
sounds like a medication I'd see on a TV commercial lol