On: Google Duo, a simple 1-to-1 video calling app

[newscracker]

I had suggested Wire [1] in a comment above [2]. It's cross platform, has cross device sync, and end-to-end encryption. Sign up can be using the phone number or an email address.

[1]: https://www.wire.com

[2]: https://news.ycombinator.com/item?id=12296477