Key features at a glance:

* Chat with anyone out of billions of people -- using their e-mail address!
* Instant messaging and synchronization across devices.
* Privacy by design: no silos, no tracking, no uploads of personal data.
* Standards based -- making use of the existing, massively distributed e-mail server network.
* Automatic end-to-end encryption using the Autocrypt Level 1 standard
* Downloads for Android, iOS, Mac OS, Linux with Windows in the works.
* Open Source development with many contributors and a diverse community.
* No Spam -- only messages of known or accepted users are displayed by default.