Built from scratch in a day in the Base44 editor. Base44 entities hold the clients, projects, quotes, review notes, invoices and activity; the pricing, round counting, invoice numbering and reminders are app logic on top of them. The design is a custom system I specified prompt by prompt: Instrument Serif for display type, Inter Tight for the UI, JetBrains Mono for every timecode and amount, a near-black "cutting room" palette with one record-light orange, and a playhead motif that carries the project's stage through the whole product (the landing hero scrubs itself through the six stages, every desk card carries a mini scrubber, and the client's notes sit as markers on a real scrubber under the video). Mobile-first on every page: a bottom tab bar on the desk, a sticky estimate bar on the brief, sticky actions on the review page.