Keybase is a chat app that features end-to-end encryption and a variety of security features. I just recently discovered it and I love it so far.
Using each of your devices generated key, Keybase will encrypt all of your messages. Your keys are stored in your device, and Keybase doesn't have them at all.
Sending Bank Passwords or super-sensitive documents? Encrypt them even more! Using Keybase's Crypto feature, you can use Saltpack encryption to encrypt your files before they're sent. You can even encrypt it so that only specified people can decrypt the file.
Is double-decker encryption not enough? It'd just be best if you never sent it right? Enter Exploding Messages! Set a timer on your messages, to have them explode when the timer ends! For your most important documents and secrets, using Keybase's Crypto feature and Exploding Messages together are an incredible combination.
Do you need to host files for your team? With Keybase, host them privately so that only your team can access them. Anyone from your team can view the files when they need to, and the files are always both signed and encrypted.
These are some of the reasons I immediately liked Keybase. Want to chat? You can find me on Keybase here!
I promise this wasn't paid I just love Keybase