Rapid Charge, as defined by Ventev Mobile, is charging your device at greater than 1 Amp via a 5 Volt output. This means that devices like the Samsung Galaxy S5, Apple iPhone 6 or 6+ and the iPad Air, which all charge at between 1.5A -2.4A, are utilizing rapid charging.
QuickCharge, on the other hand, is a form of charging developed by Qualcomm. Qualcomm is a leader in the production of chipsets for most Android devices today. Unlike Rapid Charge, QuickCharge Technology is only available for Android or non-Apple devices.
