What are some alternatives?
When comparing Instant Video on Facebook Messenger and Allo and Duo, you can also consider the following products
Google Duo - Google's answer to Facetime, high-quality video calling on iOS and Android.
Houseparty - Brining empathy to online communication.
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.
M - A personal assistant built inside Facebook Messenger
Snap Map for Web - Snap Map, now on the web 🌎
GroupMe - GroupMe is a mobile group messaging app owned by Microsoft.