Superhuman

Superhuman is a premium AI-powered email client designed for professionals who live in their inbox. Acquired by Grammarly in October 2025, it is widely regarded as the fastest email experience available, with a keyboard-first design that lets power users process email at remarkable speed.

The AI capabilities are central to the Superhuman experience. Auto Summarize provides instant one-line summaries of every email thread, letting users triage their inbox at a glance. Write with AI drafts complete emails from brief prompts, matching the user's personal tone and style. Instant Reply suggests contextual responses that can be sent with a single keystroke. AI-powered Smart Triage automatically labels and categorizes incoming email.

Superhuman's Split Inbox organizes email into customizable streams, separating VIP contacts, team messages, newsletters, and notifications. Read Statuses show when recipients open emails, providing sales-like visibility for any professional. Snippets enable templated responses with merge fields, and Reminders bring emails back at scheduled times.

The client supports Gmail and Outlook, with apps for Mac, Windows, iOS, and Android. There is no free tier; Superhuman is premium-only, reflecting its positioning as a professional tool where the time savings justify the cost.

Security features include enterprise-grade encryption, SOC 2 Type II compliance, and admin controls. Team features include shared snippets, team response time analytics, and centralized billing. The Grammarly acquisition brought additional AI writing capabilities into the platform.