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BOM Diff Tool

Compare two Bills of Materials — see added, removed, and changed parts

BOM A (original)

Format: part_number, description, qty, ref (CSV, TSV, or semicolon)

BOM B (revised)

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About the BOM Diff

Engineering change orders live or die by what actually changed between BOM revisions. Comparing spreadsheets by eye hides the part that quietly changed quantity, reference designator, or manufacturer.

This diff compares two BOMs (CSV/TSV with automatic delimiter and header detection) and classifies every line as added, removed, changed, or unchanged — with a color-coded table and CSV export for the change record. Your BOMs describe your product; they stay in your browser.

How to use

  1. Paste the old and new BOM files.
  2. Review added, removed, and changed parts with field-level detail.
  3. Export the diff as CSV for your ECO documentation.