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, so the file never leaves your computer.
Drop a workbook to scan (.xlsx, .xlsm, .xlsb, .xls)
Drop the workbook here, or 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 rather than 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. Both are 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 it stays free. What you pay for is everything a one-shot scan can't be:
- → Risk of a change. Compare two versions and see what changed and 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.
