Percy offers visual regression testing and screenshot comparison for teams detecting visual changes from CSS edits.
It compares screenshots against baselines.
When detecting visual changes from CSS edits, control fonts and animation to reduce noisy diffs.
Applitools offers visual testing and interface comparison for teams comparing interface differences across browsers.
Argos offers screenshot diffs and visual testing for teams checking whether a PR changes existing pages.
BrowserStack offers a real device and browser testing platform for teams reproducing a web issue on a specific phone.