Zuckerberg created his own Messenger chat bot for texting commands to his assistant (like "turn the bedroom lights off") and another standalone app for giving it voice commands.
Interestingly, his favorite method of interacting with his assistant is through the chat bot:
"One thing that surprised me about my communication with Jarvis is that when I have the choice of either speaking or texting, I text much more than I would have expected. This is for a number of reasons, but mostly it feels less disturbing to people around me. If I'm doing something that relates to them, like playing music for all of us, then speaking feels fine, but most of the time text feels more appropriate."
"Similarly, when Jarvis communicates with me, I'd much rather receive that over text message than voice. That's because voice can be disruptive and text gives you more control of when you want to look at it. Even when I speak to Jarvis, if I'm using my phone, I often prefer it to text or display its response."