Let me add visual diffing constraint to the discussion, otherwise I need the same as OP. percy.io is a cool visual diffing tool I used and liked a lot. Last ti

Let me add visual diffing constraint to the discussion, otherwise I need the same as OP. percy.io is a cool visual diffing tool I used and liked a lot. Last time when I used it it supported only chrome/firefox, but both mobile and desktop. Please let me ask how is visual testing supported in other solutions like: selenium, appium, browserstack, webdriver.io, etc aka what do you use for crossbrowser visual testing?