One row per invoice, a date and an amount. You get back a description of the business: when the money arrives, how much of it rides on one client, and whether the work repeats or has to be won again. It says what it cannot know, and it refuses to call twelve months a season.
Drop a CSV of invoices
date + amount required · client column unlocks concentration & repeat business
Your file never leaves this tab. It is read here and nothing is sent — drop it with your network panel open and watch. The page itself loads one analytics script, which is disclosed rather than hidden: it counts the visit, never the file.