A powerful, open-source agent inside Excel

Sees what you see

Excel is both your calculator and your interface. This gives your agent that same interface.

Pi for Excel reads the actual workbook: the structure, the formatting, the formulas, your current selection. It doesn't need an export and you can see it work in real time. It's working in the same place you are.

Built for real work

Multiple session tabs, conversation history, auto-context on every turn, any model you want. Built-in multi-provider web search and page fetch help you cross-check assumptions quickly.

Between saves, every edit gets an automatic checkpoint with one-click undo.

Make it work exactly how you want

I have very specific opinions about how my spreadsheets are set up. You might too.

Set your format conventions once and they're baked into Pi's tools. Give it Skills and files. Set house rules for yourself or specific files — like AGENTS.md and CLAUDE.md, but for spreadsheets.

Ask it to extend itself

You can ask Pi for Excel to build its own extensions — sidebar widgets, sub-agents, live data feeds, specialist tools, SaaS integrations. Extensions can call LLMs, fetch HTTP data, persist storage, and register tools through the built-in bridge.