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Build your own AI extension

The OpenAI extension on GitHub is a 150-line template: run it, swap the model for Claude or Ollama, add your own formulas and ship it as your extension.

Build or buy a collaborative spreadsheet backend

What a collaborative spreadsheet backend involves, where the time goes when teams build one, and what Jspreadsheet Server provides.

Intrasheets 6: the Excel experience as a library

One call puts a complete Excel-like application in any page: ribbon, formula bar, AI assistant and real-time collaboration on Jspreadsheet Server.

An AI agent that works inside your spreadsheets

A streamed chat that reads the live document and edits it with spreadsheet tools, under your authentication, with quotas and usage hooks.

Connect Claude to your spreadsheets with MCP

Claude Code, Claude Desktop and your own agents read and edit Jspreadsheet Server documents through the Model Context Protocol.

Gantt charts inside the JavaScript spreadsheet

A new extension draws a project timeline on the rows of a worksheet. Drag bars, draw dependencies and zoom the scale, with every change written back to the cells.

The new Formula Pro v7

525 functions, spill ranges, unions, 3D references, functions as values and Excel argument validation, for Jspreadsheet v13.

Build a Spreadsheet App with Windsurf and Jspreadsheet

Windsurf's Cascade agent edits HTML, JS, and CSS in a single prompt. Build a Jspreadsheet Pro expense tracker with formulas, dropdowns, and date pickers.

ChatGPT for Excel vs. Building Your Own AI Spreadsheet

Microsoft's add-in sends your data to OpenAI. Here's how to build a private alternative with Jspreadsheet Pro and a local AI model running on Ollama.

You've Seen AI Excel Agents. Here's How to Build Your Own.

Excel has Agent Mode. Google Sheets has Gemini. They send your data to the cloud. Build a spreadsheet agent you own, running on your own infrastructure, with any LLM you pick.

Build a Spreadsheet App with Bolt.new and Jspreadsheet

Everything runs in the browser. No install, no terminal. Prompt Bolt.new and get a full Jspreadsheet Pro app with XLSX export, formulas, and a live preview.

Export Jspreadsheet to SPSS (.sav) files

A new extension that writes native SPSS system files straight from the browser or Node.js — with column types, value labels, and measure levels mapped automatically.

Best Spreadsheet Components for Business Applications in 2026

Five JavaScript spreadsheet components compared on price, formulas, Excel support, and bundle size. Jspreadsheet Pro, AG Grid, Handsontable, SpreadJS, and Syncfusion.

JavaScript Pivot Tables: Analyze Data Without Leaving Your App

Your users export to Excel just to build pivot tables. Keep that analysis inside your app with 12 aggregation functions and multi-level grouping.

What's New in Jspreadsheet 12.3

A proper time editor, collaboration controls that prevent duplicate writes, and smarter mobile dropdowns. Plus targeted fixes for frozen panes and formulas.

Build a Spreadsheet App with Lovable and Jspreadsheet

Loveable lets you transform a text into a functional web app. This guide shows you how to use it to build a spreadsheet application without having to write any code.