All terms
Visual regression testing
Automatically comparing screenshots of a site before and after a change, to catch unintended visual differences.
Visual regression testing guards against accidental change: it renders pages before and after a deploy and diffs the pixels, flagging anything that moved. It answers "did we break how it looked yesterday?", which makes it a developer tool first.
It differs from design comparison, which checks the page against the design file rather than against a previous screenshot. Regression testing catches what changed unexpectedly; design comparison catches what never matched the design in the first place. Mature teams end up wanting both.
Because feedback shouldn’t be the hard part.
One link for your clients to review, one list for your team to resolve.