Find the changes.
Keep the context.

Make the old list your baseline

Add the old and new files. Label them with meaningful names, such as “Supplier · 2026-09-01” and “Supplier · 2026-10-01”. Choose “Old vs new price lists” and set the old file as the baseline.

Tabel does not infer the date from ambiguous filenames or date formats. Your labels are the record of which list came first. Add more revisions if useful; each is compared to the same baseline.

Read the change on a comparable basis

Absolute change = new comparable unit price − baseline comparable unit price.

Percentage change = absolute change ÷ baseline comparable unit price × 100.

The pack looks cheaper, but the comparable price rose by 2 USD per kg, or about 8.33%. A change from zero has an absolute value but no finite percentage; Tabel shows “From zero”.

Separate changes from unresolved rows

The Price changes filter shows valid, nonzero changes against the baseline. Missing rows and new products have their own views. Invalid prices, absent exchange rates and incompatible units stay in Needs attention.

A name change is a suggestion to review, not proof of a price change. Check the product ID and specification before confirming a manual match.

Keep an evidence-backed price history

Download the report after each review. It includes the chosen baseline, file names, original rows, normalized edits and user-supplied exchange rates.

Choose Save on this device to retain comparison versions and reviewed mappings in this browser. Use Saved projects & profiles to start next week’s comparison, review history and export changes. There is no cloud sync or automatic alert. Keep a JSON backup and your original lists.