Polite Notice is a $39 one-time, browser-only billing kit for US freelancers and tiny agencies. You get an invoice, a change order, and a late-payment pack (statement plus day 1, day 7, and day 14 chase emails). Unzip and double-click index.html. Data stays in localStorage. Not SaaS, not AI, not a mailer, not accounting software. Polar is merchant of record.
I kept rewriting late-payment emails until they all sounded like I was apologizing for billing. I wanted a stationery kit instead of another cloud app.