Short answer: Superhuman added two things to its Mail MCP this month. You can now add and update Superhuman Reminders from Claude, ChatGPT or another AI tool. You can also share a live view of an email and comment on it from Claude and ChatGPT. Both need a Superhuman Business or Enterprise plan. If your day already runs inside an AI chat and you want email actions there, Superhuman is the better fit for that job. Jace works the other way round. It works on mail as it lands in Gmail or Outlook, so drafts and follow-ups wait for you.
This page was written on 12 November 2026 from Superhuman's two update posts, linked below. We make Jace, so keep that in view when you read the Jace parts. We have not tested either Superhuman feature ourselves.
What Superhuman shipped
Both are add-ons to the Superhuman Mail MCP that already exists. The MCP itself is not new. Superhuman's Reminders update says: "You can now add and update Reminders from Claude, ChatGPT, or your favorite AI tool. If you don't hear back, we'll bring the thread to the top of your inbox at the right moment."
The second post, Superhuman's sharing and commenting update, covers team sharing. Superhuman Mail already let you share a live view of an email so your team can comment on it "even if they don't use Superhuman". Now you can "share and comment directly from Claude and ChatGPT". Superhuman adds: "You'll always see who gets access, and nothing is shared without your confirmation."
Both posts state that "the Superhuman Mail MCP is available on Business & Enterprise plans". Neither post lists a price, so check Superhuman's own site for that.
Two ways to put AI on your email
The real choice is where you want to work.
Email controlled from your AI chat. You sit in Claude or ChatGPT, and the chat reaches into your mailbox through MCP. You ask it to set a reminder on a thread or share an email with a colleague, and it does that in Superhuman. This suits people who spend the day in an AI chat and read mail in Superhuman.
Email handled as it arrives. The assistant watches new mail and does a first pass before you look. That is how Jace works. Per jace.ai, Jace prepares a draft for threads it labels Needs reply and saves it to your normal drafts folder in Gmail or Outlook. It applies AI labels, Needs reply and Waiting among them, as mail arrives. Threads where you wait on someone get the Waiting label, and when a conversation goes quiet, Jace can prepare a follow-up draft for you to review.
Neither way is better for everyone. They fit different habits.
MCP in Jace points the other direction
Both products mention MCP, and they use it in opposite directions. Superhuman opens your mailbox to outside AI tools, so Claude or ChatGPT can act on it. Jace connects to outside MCP servers. The Jace MCP integrations guide describes connecting remote MCP servers such as Notion or Salesforce under Settings. Jace can then use those tools in Flows and in its own chat. For example, it can look something up before it drafts a reply.
Jace's documentation describes MCP only as something Jace connects to, so we don't claim it offers the Superhuman feature set inside Claude or ChatGPT. If you need to set reminders or share threads from those chats, pick Superhuman.
When Superhuman is the better fit
- You live in Claude or ChatGPT and want email actions available from there.
- Your team comments on shared threads, and some of them don't use Superhuman.
- You already pay for Superhuman Business or Enterprise, or plan to.
You also do not need Superhuman Mail or a chat app to get drafting help from Superhuman. It launched Email Assistant for Gmail and Outlook on 3 November. We cover it in Superhuman Email Assistant vs Jace. Our Jace vs Superhuman comparison covers the wider differences, so this page does not repeat them.
When Jace is the better fit
Jace suits you if you want the inbox worked before you open it and you stay in Gmail or Outlook. Drafts land in the usual drafts folder, labels sync as Gmail labels or Outlook categories, and Flows deal with the emails you get again and again. Two groups whose replies lean on long threads: lawyers working matter threads and consultants handling several client inboxes.
Plans and inbox limits are on the Jace pricing page. To try it on your own mail, start a Jace trial and connect a Gmail or Outlook account.
FAQ
Is the Superhuman Mail MCP new? No. The November posts add Reminders and sharing with comments to the existing Superhuman Mail MCP.
Which Superhuman plans include the MCP? Superhuman says the Mail MCP is available on Business and Enterprise plans.
Can Jace set reminders from ChatGPT or Claude? Jace's documentation describes it using MCP servers from its own chat and Flows, and we don't claim it can set reminders from Claude or ChatGPT. For that, Superhuman is the documented option.
Does Superhuman share an email without asking? Superhuman says you will always see who gets access, and nothing is shared without your confirmation.
Does Jace send replies on its own? Not by default. Jace saves replies as drafts for you to review and send. Automatic sending is a separate setting you have to turn on.
Sources
- Superhuman, Reminders update
- Superhuman, Sharing and commenting update
- Jace, Using MCP integrations and jace.ai, read 12 November 2026
