User interface, speed, keyboard shortcuts, usability.

Responsiveness of interface, stability, speed of processing, good offline capabilities, keyboard shortcuts, easy to figure things out.

The speed is the whole point, and it delivers. Once you commit to the keyboard shortcuts and stop reaching for the mouse, triaging email gets dramatically faster. Split Inbox is the feature I'd miss most if I switched away; separating VIPs, calendar, and news from everything else means I actually see what matters first. Snippets save me from retyping the same replies, Send Later with the built-in "cancel if they reply first" logic is smarter than it sounds, and Undo Send has saved me more than once. The newer AI additions — Auto Labels, Auto Archive, and AI-drafted replies in my own voice — have cut down the manual sorting noticeably. It also works across both Gmail and Outlook, and the native desktop apps feel like real software, not a browser tab. On top of the product itself, the Superhuman team is genuinely responsive and helpful — they ship regular updates with new features aimed at getting through the inbox even faster, and it's clear they're actively improving the experience rather than letting it stagnate.