An API endpoint
Update the workbook — the API follows.
Run your Excel model from code — without rewriting it.
See in seconds which formulas compute exactly like Excel. Then call the model as an API.
No workbook at hand?
What do you need?
A web form
A calculator page to share or embed.
Bulk scenarios
Thousands of input sets in one request.
Why not rewrite it?
One source of truth
The model stays in Excel with its owner.
Milliseconds
Per scenario.
No surprises
Every difference from Excel shown before you ship.
Early access pricing
No sales call.
Developer
$49/mo
- 3 models
- 50,000 scenarios a month
Team
$199/mo
- 15 models
- 500,000 scenarios a month
Business
$499/mo
- 50 models
- 5 million scenarios a month
FAQ
What is WorkbookAPI?
WorkbookAPI checks which formulas in your Excel workbook compute exactly like Excel for its saved inputs, in your browser, for free. Next, in early access, it will run the same workbook as an API, a web form or bulk scenario runs, while the model stays in Excel with its owner. Only the browser check is live today.
Does my workbook leave my browser?
No. We count only anonymous totals — never values, formulas or file names. Privacy policy.
What is supported?
Most Excel formulas, including dynamic arrays and LAMBDA. Macros, Power Query and pivot tables are not run — the report flags them.
Why are some formulas not compared?
Volatile functions like TODAY, links to other files and cells without a saved Excel result are skipped.
When can I use it?
Early access opens in small batches. Join from any button above.