What are the best startups/companies dealing in web/mobile application testing across the globe?

Can anyone please name some the best startups/companies dealing in web/mobile application testing across the globe.

Top Web/mobile application testing tools in 2020:

  • LambdaTest
  • TestingBot
  • Testingwhiz
  • Crossbrowsertesting
  • Saucelabs

Source: Comparing Top 10 Cross-Browser Testing Tools of 2019 - DZone Performance