DEVICES WITH IOS 7 AND BETTER.
Sometimes you may notice problems with performance on older devices with only 512MB RAM (like iPhone 4, iPhone 4S, iPad 2, iPad mini, iPod Touch 5). If this happens please try restarting your device and turn off any applications that may run in the background.
Minimum free space in device memory (before installation): 1.5GB
IN GENERAL, DEVICES WITH ANDROID 4.0 ICS AND BETTER.
Andreno 200, Andreno 205, PowerVR SGX 540 and equivalent
single-core, 1GHz Cortex-A8 like
Andreno 225, Andreno 305, Mali 400, Tegra 3 and equivalent
quad-core, 1,5GHz+ Cortex-A9 like
Andreno 320, Andreno 330, Tegra 4, PowerVR SGX544MP3, Mali-T628 MP6 and equivalent
dual-core, 1,2GHz Cortex-A9 like