Grid

GRID is a spreadsheet engine built for products that use AI agents. Instead of having a language model write and run code to work with a workbook, an agent calls spreadsheet operations directly through GRID's tools, which the vendor says uses roughly a third of the tokens and runs up to twice as fast, while noting that real results vary with the model, spreadsheet and task. The product has several pieces. The Spreadsheet Engine runs calculations natively inside an application, headless and compatible with Excel and Google Sheets, and its documentation lists dynamic arrays, LET and LAMBDA, iterative calculation, goal seek, data tables and external references. Agent Tools run on the same engine and are also offered as an MCP server, with operations such as writes that return change deltas, warnings, precedents and dependents, and what if analysis without writing. A Spreadsheet Viewer displays workbooks in a themeable view, and a Spreadsheet Editor adds familiar editing behavior such as fill, undo and a formula bar. Workbooks are read from and written back to XLSX with formulas, values, styles, comments and tables preserved. It is intended for developers building financial models, calculators, planning tools or AI assistants that must handle real world spreadsheets. The engine installs from npm, with a free evaluation license, and is licensed commercially when a product ships. No prices are published on the site. GRID started in Reykjavik in 2018, and the vendor states its engine supports 492 Excel functions.