TREB logo (a leaf)
TREB logo (a leaf)
TREB is a fully-functional spreadsheet application that supports complex functions, formatting, styling, and layout. It’s lightweight and easy to embed in web pages and web apps. TREB can read and write XLSX and CSV files in addition to its native JSON file format.


Includes a complete library of spreadsheet functions, cell formatting and styling and layout options.


Comprehensive number and date formatting including standard and custom formats. Automatic locale-specific decimal rendering.


Themable with CSS (spreadsheet cells can still have their own text and background colors).


Access spreadsheet data with Javascript, use the API to make changes and subscribe to updates.