Sauce Labs operates one of the world's largest cloud for automation testing. It supports Appium and Selenium for functional testing of web and mobile applications. With Sauce you can run tests in the cloud on various different browser platforms and devices, providing a comprehensive test infrastructure based on Selenium. There’s no infrastructure to maintain since you just point your tests to its Cloud.
The Sauce Labs advantage includes:
Sauce Labs’ testing services are based on the Selenium and Appium open-source tools.