ClientOS - the freelancer tracker that knows what you are owed Freelance admin goes wrong the same way every time: clients in one place, hours in a notes app, invoices in email, and the answers to "what am I owed?" and "which project ate my margin?" nowhere at all. ClientOS is one workbook that holds all of it. You type rows; it does the counting. No app, no login, no subscription - a file you own, with formulas you can inspect. What is inside - the seven tabs Read me - one minute of orientation: which tab to type in, which to leave alone, and the one rule that keeps the totals honest (add rows inside a block, never below it). Settings - the tab that makes it yours: currency symbol, your business name, the number your invoices start from, and the three status lists (clients, projects, invoices) that every dropdown reads. Yellow cells mean yours to change; everything else computes. Client
Watch it work - the real flow, no sound needed:
Long answers to the job this file does: How to keep track of unpaid invoices without a system you hate · What to look for in a client tracker before you pay for one · How to write a late payment reminder that actually gets paid · The client onboarding checklist that prevents every later argument · The one-page weekly review for a one-person business · What every invoice line item should say (and what never to write).