By sector
Plumbers, electricians, builders, painters: quote by line item, keep track of materials, and invoice without losing your afternoons to the computer.
Each line accepts its own unit of measurement, with shortcuts to add transport, haulage or mileage. You set the amount.
A timer with alerts, a materials inventory, and it all flows into the draft invoice.
Income minus the cost of materials and your hours: you know which jobs are worth it.
When the client accepts, one button turns it into an invoice without retyping anything.