GLBenchmark, a creation by Kishonti Informatics that also made DXBenchmark and the CLBenchmark, has been a part of our smartphone review benchmark list for a while and now it is finally available across all platforms, including Apple's App Store in case you want to try it on your iOS device.
After launching on Android, GLBenchmark/DXBenchmark 2.7 launched for Windows 8 and Windows RT back in late March and now it is also available on Apple's App Store as well making it a perfect benchmark in case you want to compare cross-platform and cross-API devices.
Currently, the Apple iPad 4 is leading the pack (excluding Windows 8 and desktop graphics cards) in DX/GLBenchmark 2.7 T-Rex HD offscreen 1080p benchmark followed closely by Xperia Z and the HTC's flagship HTC One. The same Apple iPad 4 also leads in the DX/GLBenchmark 2.5 Egypt HD offscreen 1080p test. The next in line is surprisingly Nvidia's Shield handheld console showing that Tegra 4 can pack a punch at least if Nvidia has it in their hands.
You can check out more about GLBenchmark here while comparable results across platforms can be found here.