Slip is a FREE one-page freelance invoice: offline HTML (any browser, Print → Save as PDF) plus Excel/Sheets. Yellow cells are yours; totals calculate. Not a tracker, no aging, no payments log. Need who-owes-you? Upsell Ops: nydaymuse.gumroad.com/l/ggnfxs. Static download. No support.
Freelancers often need one clean invoice they can use immediately without a subscription, account, or online service. Slip keeps the job focused: fill the yellow cells, let totals calculate, and print or save a PDF offline.