Is your spreadsheet lying to you?

Most spreadsheet errors go undetected. Yours might have them right now.

Drop a file here to find out

or pick a file

xlsx, xls, csv, tsv, txt — up to 10 MB

What gets checked

Benford's Law: The digit distribution test forensic accountants use. If your numbers don't follow the expected logarithmic curve, something may have been made up.
Duplicates: Exact duplicate rows, plus columns with suspiciously low variation. Copy-paste mistakes and double-counted entries surface here.
Outliers: Two independent statistical methods (Z-score and IQR) run separately. We only flag a value when both agree it doesn't belong.
Data integrity: Missing values, numbers stored as text, mixed date formats, invisible whitespace. The slow rot that accumulates in every spreadsheet over time.

Files are analyzed in memory and discarded immediately. Nothing is stored.