Sauce Labs offers cross-browser and mobile testing service for teams validating user flows across devices.
It provides remote web and mobile test environments.
When validating user flows across devices, link failure recordings to test cases.
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.