The first inbox where AI agents and humans work in the same threads. Upstream redesigns email around one assumption: agents are teammates, not add-ons. They read, reply, and act in the same inbox humans use - no separate dashboard, no integration layer. The shift from "AI helps with email" to "AI works in email alongside you" is subtle, but it changes the entire communication stack.
https://www.upstream.do/
https://www.upstream.do/