iPerf2 is a bandwidth performance measurement app for iOS and Mac OS. The app can operate as a client and/or server. iPerf2 can be used for Mac OS-to-Mac OS testing, Mac OS-to-iOS testing or iOS-to-Mac OS testing. iPerf2 should work with other operating systems that support iPerf2.x App has client mode and server mode. Windows size for TCP testing and datagram size for UDP testing can be customized. App is compatible with iPerf2 iOS app. iPerf2 has also been tested and is compatible with iPerf version 2.0.5 and jPerf.