You're one step away from better formula work.
Choose your platform below. Install takes about 2 minutes — start free, no credit card required.
- Free plan — no credit card
- No credit card
- Upgrade only when you need more
Excel add-in or Google Sheets add-on
Pick your platform
Workspace add-on
Google Sheets
Turn Google Sheets into a maintainable formula environment.
- Multi-line editor with @@variables
- Excel-to-Sheets translator built in
- Snippets sync across your team
Opens Google Workspace Marketplace
Excel for the Web add-in
Microsoft Excel
Reuse logic across workbooks — without rebuilding the same formulas.
- Multi-line editor with @@variables
- Works in Excel for the Web
- Same library, both surfaces
Opens Microsoft Marketplace
How to install the add-in
From click to first formula in 2 minutes
- 01
Install from the marketplace
One click on the install button, then accept the marketplace permissions. We never ask for broad Drive or workbook scope — only the spreadsheet you have open.
- 02
Open Formula Foundry in any sheet
Find it under Extensions → Formula Foundry on Sheets, or in the Home → Add-ins ribbon on Excel. The editor opens in the sidebar and runs in your sheet. The AI assistant is opt-in and only sees what you reference.
- 03
Start free, no credit card
Install it, open any spreadsheet, and start building formulas on the free plan right away. No credit card, no countdown. Upgrade to Pro whenever you need more.
Trusted by formula professionals
“The variable syntax is brilliant. Changing a tax rate from 0.08 to 0.10 instantly updated 500+ formulas. Makes spreadsheets maintainable and formulas self-documenting. Perfect for financial modeling.”
Namrit ShethData AnalystAdd-on data privacy
The editor runs in your sheet. AI only sees what you reference.
The Formula Foundry editor runs inside your Sheets or Excel session. The AI assistant is opt-in and only sees the formula or range you reference. We never request broad Drive or global workbook scope. Variables you define are stored in a hidden sheet inside your own file — not on our servers.
Install FAQ
Before you install
- No. Install the add-on, open it in any spreadsheet, and you're on the free plan right away. You'll only see a billing page if you decide to upgrade to a paid plan.
- Nothing ticks down — the free plan is permanent. Use Formula Foundry as much or as little as you like, and upgrade only when you want Pro features.
- On Google Sheets, only the spreadsheet you currently have open — never broad Drive or global workbook scope. On Excel for the Web, only the active workbook. We never read other files.
- Yes. Your account, snippets, and variables sync across both surfaces. Install whichever you use most today; add the other later for free.
Free for Excel & Google Sheets
Pick a platform.
Start writing better formulas.
No credit card. Free plan. Cancel anytime — but most analysts don't.
Already installed? Open Formula Foundry in your spreadsheet to sign in.