The main difference is that gecko with the web apis to access hardware features provide a very nimble layer that makes quite easy to develop apps with JS that previously could only be developer with Java or Obj-C&#x2F;Swift. Its like phonegap without wrappers.<p>Imagine if your web app could directly talk to hardware sensors, disk and phone features if the user gave it permission.<p>The difference is that blink does not offer such APIs not this tight integration with the OS to the point where gecko is the OS. It used to be called &quot;boot 2 gecko&quot; for a reason