Your spreadsheet runs your business.
We make it dispute-proof.
Formualizer turns your Excel models into live web applications — your formulas, your logic, your math — with built-in audit trails, automated runs, and AI-powered explanations. No conversion. No rewrite.
Your most important model lives in a spreadsheet nobody else can touch.
Compensation plans. Financial models. Allocation formulas. The logic that determines who gets paid what — it lives in a spreadsheet that one person understands, updated by hand every month, emailed as 30 separate PDFs.
When someone asks “why did my number change?” the answer takes 45 minutes of manual cell-tracing. When the board asks “what if we change the assumptions?” someone rebuilds the model by hand.
The standard advice is: rewrite it. Migrate to a platform. Hire developers. Spend six months and six figures replacing logic that already works. We think that’s backwards.
Keep your spreadsheet. Lose the busywork.
Upload
Drop your .xlsx — formulas, named ranges, multi-sheet references and all. We read the actual formula graph, not a flattened copy.
Map
We identify your inputs, calculations, and outputs. You confirm what goes in and what comes out. Your formula logic stays untouched.
Run
Upload new data. Results recalculate instantly. Every output is traceable back to the cell that produced it. An AI agent can explain any change in plain English.
Built for the people who own the spreadsheet —
and the people who depend on it.
I run critical operations in Excel
Comp models, royalty calculators, commission plans, deal models — your stakeholders see their own numbers. Every output traces to a cell.
See use cases →I build with spreadsheets
Embed a full recalculation engine in Rust, Python, or WASM. 320+ Excel-compatible functions. Open source.
Read the docs →I want AI agents that understand spreadsheets
Give your LLM agent tools to read, edit, recalculate, diff, and explain any workbook. MCP server + CLI.
See agent-spreadsheet →Open-source engine. Production-grade execution.
Formualizer is the spreadsheet engine under the hood. Arrow-backed storage, incremental recalculation, deterministic evaluation. Battle-tested and permissively licensed.
Explore on GitHub →Send us your workbook. We’ll show you what it looks like operational.
No rewrite. No six-month timeline. Just your logic, running live, in 48 hours.
Book a demo