One replaces your email client. The other lives inside the Outlook you already use. Here is the honest comparison for professionals on Microsoft 365.
Superhuman is a beautiful, fast email client. To use it, your team migrates off Outlook into a separate app. If you are an individual on Gmail and you want a faster keyboard driven inbox, Superhuman is genuinely loved.
SMART Reply is a Microsoft certified add in. It does not replace Outlook. It runs inside it, on desktop and on web. Your emails never leave your tenant, your team keeps their existing setup, and you get AI drafting, meeting follow through, booking pages, travel planning, document filing and brand controls in the same product.
The choice is rarely about features alone. It is usually about whether your organisation wants a different email client, or wants to keep Outlook and add the missing layer on top.
Pricing accurate as of May 2026. Check competitor sites for current rates.
SMART Reply Signal turns important meetings and emails into tracked follow through. It captures actions, drafts replies, detects responses, updates action status, finds related emails and keeps the conversation moving until everything is complete.
Signal decides what should happen next. SMART Reply writes the actual email using the normal drafting pipeline.
Superhuman is a separate hosted email client. To use it, your inbox content is processed on Superhuman's servers, not inside your Microsoft 365 tenant. Integrations with Teams, SharePoint and shared mailboxes also break in the migration. SMART Reply layers on top of Outlook as a Microsoft certified add in. Your email data never leaves your tenant, and nothing changes for the rest of your stack.
Superhuman is an email client. SMART Reply covers email, LinkedIn, meetings, travel, booking pages and document filing. For a sales lead or founder whose day spans Outlook, LinkedIn and back to back calls, that scope matters more than a faster inbox.
SMART Reply Signal turns important meetings and emails into tracked workflows. It captures actions, drafts replies, detects responses, reconciles completion and recommends the next step. Superhuman has no equivalent. For enterprise teams, this is the differentiator.
Superhuman is a dedicated email client that replaces Outlook, so you migrate your inbox into a different app. SMART Reply is a Microsoft certified add in that runs inside the Outlook you already use. If your team is on Microsoft 365 and you do not want to migrate, SMART Reply is the lower friction choice.
SMART Reply is £35 a month or £350 a year. Superhuman is around £33 a month, plus the cost of moving your team off Outlook. SMART Reply also includes meeting intelligence, branded booking pages, travel planning, OneDrive filing and brand identity controls in the same price.
No. Superhuman is an email client. SMART Reply ships a Chrome extension that adds an AI draft button to LinkedIn comments and direct messages, so you can reply on LinkedIn without leaving the page.
If your organisation runs on Microsoft 365 and your team uses Teams, SharePoint and shared mailboxes, switching to a separate email client breaks that integration. SMART Reply layers on top of Outlook, so you keep your existing setup and add AI drafting, meeting follow through, booking pages and filing.
Yes. Superhuman is a separate hosted email client. To use it, your team migrates from Outlook into Superhuman's app, and your inbox content is processed on Superhuman's servers. SMART Reply works the opposite way: it runs as a Microsoft certified add in inside your existing Outlook, so your email data never leaves your Microsoft 365 tenant. For regulated industries and any team handling client confidential information, that distinction is the difference.
Yes. SMART Reply Signal is an enterprise add on that captures important meetings and emails as tracked follow through. It identifies actions, drafts replies, detects responses, reconciles completion, finds related emails, recommends the next step and keeps the conversation moving until it is marked complete. Superhuman does not have an equivalent.
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