Free playground
Build any spreadsheet formula right here. No signup.
The real Formula Foundry editor, running in your browser. Multi-line editing, named variables, and instant Google Sheets ⇄ Excel translation.
No account · No credit card · Nothing to install
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Everything here is free. Inserting into your real sheet, AI, and cross-device sync live in the add-on.
Ready to use it in your actual spreadsheet?
The playground is the real editor — the add-on adds the three things a browser tab can't.
Insert into your real sheet
One click drops the formula into the exact cell you're on — in Google Sheets or Excel.
AI writes & explains
Describe what you want in plain English, or ask the assistant to explain any cell.
Sync, save & share
A formula library that follows you across devices and your whole team.
Install free Free plan · No credit card · Google Sheets & Excel