Nylas is two things:<p>1. APIs for developers that replace IMAP&#x2F;SMTP&#x2F;Exchange. Use this to build any app that integrates with a user&#x27;s mailbox, calendar, or address book.<p>2. A new extensible email app, built on web technologies (Chromium+NodeJS). This is called N1 and was released about 2 months ago.<p>We sell the APIs as an infrastructure business (like AWS).