Budget Buddy

A year of money, read at a glance.

Home opens on net worth and the last 30 days of income and spending. Statistics breaks any period down into an overview, spending by category, net worth and cashflow. The transaction list groups entries by day and shows each account's balance after every entry.

Every expense in a few taps.

An expense is a move from one account to another: from the card it was paid with to the category it was spent on. Categories are illustrated tiles grouped into sub-accounts, so Groceries sits one tap inside Food. Every entry is double-entry underneath.

• 111 illustrated categories come with a new install.
• Splits send one payment to several categories.

Balances that cannot drift.

The ledger is three tables: transactions, their entries and opening balances. No total on screen is kept up to date by hand. Cached balances are marked stale by the database itself, and running balances are never stored at all.

• Equivalence tests hold the fast paths to the same answer as a full recomputation.

The bank statement checks the app.

Import a statement and the app matches each bank row to its own entries. Rows the bank has and the app does not become review cards. Then each day's closing balance is compared with the bank's, so a gap shows up on the day it appeared.

• Six bank formats are read natively, Revolut and monobank among them, plus any CSV.
• When only the time of an entry differs, one tap aligns it with the bank.

The same ledger on a bigger screen.

On the same Wi-Fi, the phone serves a web console to a browser. The browser asks for a four-character passcode, the phone asks its owner to confirm, and the computer then works with the ledger on the phone. The data does not leave the local network.

• The console is a Vue 3 app with ECharts, served by a small shelf server inside the Flutter app.