Let's say you just built a nice system that opens and closes your curtains, it would be nice to control it using your voice, or from your phone, or from a web browser, or just using any of your devices in the way that is more convenient for you, but this would require you to program your device to connect to each service, probably set up your own server, configure it in a safe way, manage web requests, and so on... or you can just sign up and use Smartnest, you can have it running in less than 10 minutes.