Upstream

Upstream is a messaging application built on top of email infrastructure that streamlines workplace communication and inbox management for teams. It intelligently organizes messages into segments like "Needs Reply," "VIP," and "Noise" so critical communications get priority attention, and generates AI-powered draft replies that match the user's writing style, accounting for recipient context and conversation history. Upstream automatically times follow-up messages based on thread context, filters out cold emails and newsletters, and supports multi-user workspaces with shared inboxes and channel organization across web and iOS.