Most freelancers juggle a spreadsheet for expenses, one app for invoices, and a separate calculator at tax time. Nothing talks to each other. Simplance puts it in one workspace: send proposals and convert them to invoices in a click, track expenses by tax category, estimate federal, state, and self-employment taxes, forecast cash flow, and ask an AI advisor about your actual numbers. Built only for freelancers, so it isn't bloated for agencies. Free to start, no card required. US and UK.