Spreadsheetor is a Chrome extension developed by TabRail that allows users to seamlessly create and edit CSV and MD files in a convenient side panel. This tool enables users to work with local files without the need to switch tabs or windows, enhancing productivity and workflow efficiency.

Key features of Spreadsheetor include the ability to create spreadsheets directly in the side panel, view and edit local spreadsheet files such as XLSX and CSV formats, all without involving a server. Users can enjoy a hassle-free experience as no permissions are required, and the tool ensures no tracking or ads, prioritizing user privacy and convenience.