After 16 months of development with over 4,200 commits from 105 contributors, Appium now has 1,139 stars and 922 forks on GitHub. It allows testing of mobile applications using the Selenium WebDriver protocol to access Apple's UIAutomation framework for iOS apps and Google's UiAutomator framework for Android apps without being tied to a specific programming language. Appium uses a client-server architecture to scale testing across devices and environments.