Yes there is, it's called Signal[1], by the same developers. It started out as two separate products, but you can use them to chat between iOS and Android. [1]

Yes there is, it's called Signal[1], by the same developers. It started out as two separate products, but you can use them to chat between iOS and Android. [1]: https://itunes.apple.com/us/app/signal-private-messenger/id874139669?mt=8 https://itunes.apple.com/us/app/signal-private-messenger/id8...