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Numo
An offline-first Android expense tracker. No account required. No cloud. No privacy policy to scroll through. Everything lives in SQLite on your phone. My sister and I use it daily.
"Most finance apps require an account, sync to the cloud, and have someone else's server holding your data. Numo doesn't do any of that."
— The reason I built itMonthly spending vs budget at a glance. Remaining budget, recent transactions, one tap to add a new expense.
Full transaction history grouped by date. Search by name, filter by category (Alimentación, Hogar, Ocio, Salud...).
Set up subscriptions once. Configure periodicity (monthly/quarterly/yearly), billing day, and advance notification (1 day, 3 days, same day).
Set spending caps per category with a visual progress bar. Edit or remove limits at any time.
Pie chart by category, 6-month evolution bar chart, month-over-month comparison with % change.
Export all expenses to CSV or generate a monthly PDF report. Your data, your format, your device.
Designing a local-first app means thinking differently about data. There's no API to fall back on — if the SQLite schema is wrong, everything breaks. I spent more time on the database design than I expected, especially around the recurring expenses logic.
The recurring expenses feature was the trickiest part: figuring out when to trigger notifications, how to handle missed payments, and how to make the periodicity logic work cleanly without overcomplicating the data model.
Also: export to PDF from an Android app is way more annoying than it sounds. But it works, and that's the point.