Enter the source list
Paste the full inventory or set you want to check into List A.
A minus B calculator
List Difference – Find Items Missing from B
Calculate A minus B: every unique value in the first list that is not present in the second. Switch the list order when you need the reverse difference.
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List Difference
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How to use List Difference
Enter exclusions
Paste existing, completed, blocked, or comparison values into List B.
Get A minus B
The result contains unique items present in A but missing from B.
Common uses
Migration checks
Find records that have not reached a destination system.
SEO audits
Find URLs or keywords missing from another export or report.
Inventory gaps
Identify expected SKUs, IDs, or labels missing from a list.
List Difference FAQ
What does A minus B mean? +
It means values that exist in List A after removing every value that also appears in List B.
How do I find values only in List B? +
Swap the two input lists and run the difference again, or use the full Compare Lists tool.
Are repeated values included repeatedly? +
No. The result returns unique difference values in their original List A order.
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