Margin

A scratch calculator and ledger for costs, comparisons, budgets and more.

Collect numbers from the web, calculate with them, and keep every figure connected to its source. Margin is a side-panel workspace for turning scattered figures into something useful. Capture a number or short selection from a webpage, and Margin keeps the value together with its label and source. Arrange what you collect in a sheet, run calculations, and turn your findings into a clear summary. You can also enter values manually or start from a reusable template. Use Margin for research, price comparisons, trip planning, budgeting, project estimates—anything that involves gathering figures across tabs. Margin lives in Chrome’s side panel, so your working ledger stays available while you browse. Your Margin data stays on your device, stored locally in your browser. No account is required, and your working data is not sent to an external service.