Ledger
One line per expense, integer cents, and a month that adds itself up by category.
Running here in the page — the same app the desktop opens.
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Budget apps want your bank login. This wants a number and a note. Each entry is an amount (stored as integer cents — no floating-point pennies), a category, and a local calendar day; the month view totals itself and draws a category breakdown you can read at a glance.
Because it lives inside the OS, the month is also data: send it to the SQL Playground as CSV and query it, or to Convert to reshape it. No accounts, no sync, no server — the Settings backup carries it between machines.
What people open it for
- Tracking a month of spending without a bank connection
- Answering "where did it go" with a category bar chart
- Sending the month to SQL for the questions the app doesn't ask