What are some alternatives?
When comparing Zoom and Google Duo, you can also consider the following products
GoToMeeting - GoToMeeting is a web conferencing service offering a range of services which are available on Mac, PC, iOS and Android devices.
WhatsApp - WhatsApp Messenger: More than 1 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere.
join.me - Instant screen sharing. Instant Aha!
Skype - Stay in touch with your family and friends for free on Skype. Download Skype today to chat and call on desktop and mobile.
Houseparty - Brining empathy to online communication.
Skype Meetings - Click a button to start a free video call