I tried a couple other WiFi garage door openers but they depended on my opener being and to accept a new code. Basically, those devices were like another remote control you would have in your car.
Nexx is nice because it is hard wired into the opener much the same way the wall button would be. The sensor gives a more dependable indicator for if the door is open. This was easy to install and set up. Just make sure you are using the correct app which is Nexx Home.
Replacement Mounting Brackets for Sensors