Overlayer (Devoteam Knowledge Services) vs Superhuman

Combines shared inboxes and team chat with AI assistance, but feels less optimized for solo speed.

AI-powered knowledge base that turns documents into fast answers

Provides a smart inbox and AI writing tools across devices, but offers less advanced custom triage shortcuts.

Bring ChatGPT, Claude and Gemini into Google Docs, Sheets, Slides and Gmail

Delivers cross-platform AI email management with strong privacy focus, but has a more traditional interface.

SpecialistAn AI executive assistant that works across your inbox, calendar and meetings

A private, visual AI space to save and remember anything — no folders, no tagging

Offers an AI-native email client with automated summaries and bundles, but lacks Superhuman's extreme speed focus.

Your files, notes and meetings in one drive — with an AI that knows all of it.

Transforms email threads into conversational chat workspaces with AI summaries, but changes the traditional email layout.

Free / Open-sourceProvides an open-source AI assistant for email sorting and cold email blocking, requiring self-hosting for full control.

Agentic AI enterprise search with custom agents and no-code workflows