Compare two .xlsx or .xlsm workbooks without sending them to our server. Start instantly in the browser, then use the downloadable CLI when the comparison must run offline, in scripts, or in CI.
One comparison, two workflows
The browser reads the workbooks on your device and performs the comparison in a background worker. The files are never posted to the Node server.
The downloadable executable runs without a browser and can be called from PowerShell, Terminal, build scripts, scheduled jobs, or CI pipelines.
A focused workflow
Select the baseline workbook and its revised version. “Choose” grants browser access to those files; it does not upload them.
Compare cells by position, or identify a sheet and key column so inserted or reordered rows do not create a wall of false changes.
Inspect added, removed and changed values or formulas, then download a self-contained HTML report or machine-readable JSON.
Privacy you can verify
The comparison page uses locally hosted code and contains no advertising or third-party analytics. Your browser performs the workbook processing. When a comparison finishes, only its mode and change count are reported to this site for an operational Telegram notification; workbook names, paths, contents, and reports stay on your device.
Read the complete privacy explanation →Only the files you explicitly choose are read, in browser memory, for the current comparison.
WorkbookLens reads workbook data and formula text. It does not run VBA or recalculate formulas.
HTML and JSON reports are generated with browser Blob downloads, not uploaded and returned by an API.
Useful when the question is “what moved?”
Find changed assumptions, values and formula text without placing confidential workbooks in a cloud comparison service.
Match rows by SKU, account number or another key so sorting and inserted records do not drown out meaningful changes.
Compare expected and actual workbooks, archive HTML/JSON evidence, and fail a pipeline when the export changes unexpectedly.
Practical workbook guides
A clear workflow for finding changed values, formulas, sheets, and records.
Read the guide →Compare reordered tables without turning every moved row into noise.
See the keyed example →Use exit codes and saved evidence to catch unexpected Excel export changes.
Build a regression check →Choose the right edition
Focused by design
WorkbookLens focuses on the workbook evidence teams use most: values, cached displayed values, formula text, cell types, sheet changes, and keyed-row comparison.
WorkbookLens CLI · Personal
The browser comparator remains free. The Personal license is for one person who wants a self-contained executable on their own devices, scripts and CI jobs.
Personal license: one named user, a self-contained download, and offline automation for $39.00 once.
Buy the CLIQuestions before you compare
No. A browser file picker grants the page temporary access to that selected file. WorkbookLens does not call a comparison API or send its contents to the server.
The CLI removes the manual browser step. It works in scripts, scheduled jobs and CI; returns reliable exit codes; writes reports to chosen paths; and can run fully offline after download.
It is a command-line program. Extract the ZIP, open PowerShell in that folder, and run .\workbooklens.exe "before.xlsx" "after.xlsx" --html ".\report.html".
No. WorkbookLens compares stored formula text and cached workbook values. It does not execute macros or reproduce Excel's calculation engine.