(disclaimer: I'm an appium committer) While Frank and Appium provide a similar set of solutions to a similar problem, we're driven by slightly different philoso

(disclaimer: I'm an appium committer) While Frank and Appium provide a similar set of solutions to a similar problem, we're driven by slightly different philosophies. Two of Appium's core tenets are (1) you shouldn't have to modify your source code or add 3rd-party libraries to test, and (2) it's better to leverage existing successful "driver" protocols. To that end, we've designed things so that all of the interaction takes place between Appium and your un-modified app, whereas Frank requires compiling in its own libraries for testing. Likewise, we opted to make Appium a Selenium WebDriver-compatible server, so that the thousands of developers who are already familiar with using their favorite WebDriver library can jump in and start writing tests without having to wrap their heads around a new automation model. Frank is an extremely impressive piece of technology, but we felt the need for an approach born out of a different philosophy.