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Pi for Excel
A powerful, open-source agent inside Excel·pi-for-excel.vercel.app
Pi for Excel is a free, open-source AI agent that runs inside Excel as a sidebar add-in. It reads the actual workbook — structure, formatting, formulas, and current selection — and can make changes directly, without needing an export. It includes built-in multi-provider web search and page fetch, and works with any AI model the user already has access to via login or an API key. Users can extend it with custom sidebar widgets, sub-agents, and tools.
What it's for
Clean up raw pasted data and build a summaryExplain assumptions and logic behind a modelCross-check spreadsheet data with web search and PDFsFetch live FX rates and update a currency column automaticallyBuild custom extensions such as sidebar widgets or specialist toolsUse tmux to integrate with Claude Code to build a webpage from a file's analysis
Features 16
- Auto-context on every turn
- Automatic checkpoint with one-click undo between saves
- Automatic updates on reopening the sidebar
- Built-in multi-provider web search and page fetch
- Conversation history
- Custom house rules / formatting conventions (e.g. number formats, cell colors)
- Extensible via custom extensions (sidebar widgets, sub-agents, live data feeds, SaaS integrations)
- Extensions can call LLMs, fetch HTTP data, persist storage, and register tools
- Local CORS proxy helper for OAuth login
- Login with existing AI subscription (e.g. Claude, Copilot) or API key
- Makes changes directly inside the workbook
- Multiple session tabs
- Open source and MIT licensed
- Reads workbook structure, formatting, formulas, and current selection
- Supports Skills and files as custom instructions
- Works with any AI model the user already has
At a glance
free tieropen source
TypePlugin / add-on
DeploymentInstalled (local)
PlatformsmacOS, Windows
Integrations
ClaudeCopilotClaude CodeGitHubtmux
Pricing
Product is free and open source; no paid plans are stated.
FreeFree
No pricing tiers; entirely free and open source.