A first party AI baked into the Microsoft 365 suite versus a polished email client that replaces Outlook entirely. Here is the honest comparison plus a third option to consider.
Microsoft Copilot is the AI Microsoft built into the M365 suite. It sits inside Outlook, Word, Excel, PowerPoint and Teams with one generic AI that summarises, drafts, analyses and answers questions across your files. It is broad and reliable but rarely sounds like you.
Superhuman is at the other end of the spectrum. It is not really an AI tool first. It is an email client. A polished, fast, keyboard driven application that replaces Outlook and Gmail with its own user interface. AI features were added on top of that, but the headline reason people pay for Superhuman is the speed and the experience, not the AI.
Microsoft Copilot is around £25 per user per month and requires an existing Microsoft 365 subscription. Superhuman is around £33 per user per month and works with both Outlook and Gmail accounts. They solve different problems. There is also a third option that solves a problem neither of them does.
SMART Reply is a Microsoft certified Outlook add in. It lives inside Outlook the way Copilot does (no migration), but trains on your business the way neither tool does. Your last 400 emails, your website, your documents and your customers' websites build a private knowledge base so every email, LinkedIn post and meeting follow up sounds like you. Plus travel planning, booking pages, meeting intelligence and one click filing to OneDrive and SharePoint. £35 per user per month with a 14 day free trial.
Try SMART Reply free for 14 daysSuperhuman replaces your email client and your team has to migrate. SMART Reply is a Microsoft certified add in that lives inside the Outlook you already use. No new app to learn. No inbox migration.
Copilot drafts in a generic professional voice. Superhuman's AI is light. SMART Reply learns from your last 400 emails, your website, your documents and your customers' websites. The drafts sound like you and know your business.
Copilot is generic across the suite. Superhuman is just email. SMART Reply covers Outlook drafts, LinkedIn posts and comments, travel planning with diary blocking, branded booking pages, meeting intelligence and one click filing to OneDrive and SharePoint.
Microsoft Copilot is built into the Microsoft 365 suite and lives inside Outlook alongside Word, Excel and Teams. Superhuman is a dedicated email client that replaces Outlook with a faster keyboard driven experience. If you live in Microsoft 365 and want a generic AI assistant across the suite, Copilot is the cleaner fit. If you want a polished standalone email experience and are willing to migrate from Outlook, Superhuman is the choice.
Microsoft Copilot is around £25 per user per month and requires a Microsoft 365 subscription. Superhuman is around £33 per user per month and works with any Gmail or Outlook mailbox. The price difference is small. The bigger difference is what you get for it: Copilot adds AI to your existing M365 apps, Superhuman replaces your email client.
Yes. Superhuman works with both Gmail and Microsoft Outlook accounts. The catch is that you migrate to the Superhuman client. You stop using the Outlook app or Outlook on the web. Your email itself stays where it is, but the user experience changes entirely.
Yes. Microsoft Copilot inherits the full Microsoft Graph permissions of the user, including SharePoint and OneDrive access. Documented incidents have shown Copilot surfacing payroll, HR or strategy documents that the user had stale or over broad permissions to. Superhuman processes only your email, not your wider files.
Yes. SMART Reply is a Microsoft certified Outlook add in that lives inside the Outlook UI without replacing it. It learns from your last 400 emails, your website, your documents and your customers' websites, and covers LinkedIn posts and comments, travel planning, branded booking pages, meeting intelligence and one click filing to OneDrive and SharePoint. £35 per user per month with a 14 day free trial.
14 days free. No credit card. Cancel anytime. Microsoft certified, lives inside Outlook, trained on your business.
Get SMART Reply for Outlook