Free · No upload · No account
Scan your workbook for spreadsheet risks
Drop a single Excel file and get a static audit of what's risky — circular references, error cells, formulas that break their own pattern, numbers stored as text, hidden data. No second file, no Excel, no install.
Audit one workbook in your browser
Drop a workbook below. The scan runs locally via WebAssembly — the file never leaves your computer.
Drop a workbook to scan (.xlsx, .xlsm, .xlsb, .xls)
.xlsx .xlsm .xls .xlsb
or click to browse
No file needed — scan a sample SaaS operating model & DCF valuation.
What the scan checks
A deterministic, static audit — the same rules run, in the same way, every time. No formula execution, no AI guesswork.
Circular references
Every cycle of cells that depend on each other — reported in full, not one at a time the way Excel does.
Error cells
#REF!, #DIV/0!, #N/A, #VALUE! and the rest — found across every sheet at once.
Inconsistent formulas
A cell that breaks the pattern of a filled row or column — the classic overtype or mis-fill that hides a wrong number.
Numbers stored as text
Values that look numeric but are text, so SUM and other functions silently skip them.
Hidden & concealed data
Populated very-hidden sheets and cells hidden by a ";;;" number format — common concealment patterns.
Hard-coded constants
Significant numbers buried inside formulas instead of living in a labelled input cell.
The scan is free. The gate is the product.
Scanning one file, once, in your browser is free — and always will be. What you pay for is everything a one-shot scan can't be:
- → Risk of a change. Compare two versions and see not just what changed, but what's now dangerous — a formula overtyped with a constant, protection removed, an error newly introduced.
- → Assertions that hold the line. Declare what must stay true ("this total equals that one") and re-verify it on every future version — a regression-test suite for your spreadsheet, especially for changes made by AI agents.
- → Continuous governance. Every change to a watched file is checked automatically and gated on sign-off, with waivers and an audit trail.
