Superhuman Go is an AI assistant app from Superhuman, the company Grammarly now belongs to, that helps you understand content, prepare for meetings and refine writing right on the page you're already working on. As of Nov 2026 you can run it as its own app on Windows, Mac, iOS and Android, as a Chrome or Edge extension, at go.superhuman.com, or inside the Grammarly you already have once you switch it on in settings.
Grammarly's help centre describes Go as a collaborator for information-heavy work. The idea is simple: instead of copying text into a separate chatbot, you ask for help where the text already is.
Every place you can run Go
| Surface | Where you get it | Note |
|---|---|---|
| Superhuman Go for Windows or Mac | Desktop app | Opens from the Superhuman Apps Manager, the Start menu or the dock, and may open by itself the first time for onboarding |
| Superhuman Go extension | Chrome or Edge | Click the Superhuman icon in your extensions list, then Open Go |
| Grammarly for Windows or Mac | Your existing Grammarly desktop app | Only after you switch Go on in settings |
| Grammarly browser extension | Chrome or Edge | Only after you switch Go on in settings |
| Web | go.superhuman.com | Full-screen Go in any browser |
| Mobile | iOS and Android | Your tasks follow you across devices |
The keyboard shortcut to open a chat is worth learning on day one: Ctrl + Cmd + Shift + G on a Mac, or Ctrl + Alt + Shift + G on Windows. For connector jobs you just ask in plain words, such as 'What's on my calendar tomorrow?' or 'Draft a reply to this email'.
Turning Go on inside Grammarly
If Grammarly's already installed, you don't need a new download.
- Open the settings in your Grammarly browser extension or desktop app.
- Switch on the option called Use Superhuman Go.
- Open Go from the Superhuman icon, or visit Superhuman Go and select Open Go, which opens it in your Grammarly client.
- Type what you want done in the chat box, or highlight text on the page and ask about it.
What changes when you switch: Grammarly's explainer says you'll still see the Grammarly button in text fields, and the underlines stay. Grammarly's generative AI features are replaced by Go, and the plagiarism and AI detection agents open from the sidebar. Documents you saved in docs or the Grammarly Editor stay where they are. If you'd rather go back to plain Grammarly, or switch it off on certain sites, there's a guide to turning Grammarly off.
Upload limits and file types in Go chat
You can attach files so Go has context: a report to summarise, a screenshot to get feedback on. Grammarly says uploads work on both Superhuman Free and Pro. As of Nov 2026 the limits are:
- Images in JPEG, PNG, GIF or WebP: up to 7 MB each.
- Every other file type: up to 30 MB.
- Up to 5 files per chat.
Supported files go well beyond PDFs: Word and other document formats, Excel and CSV spreadsheets, PowerPoint and Keynote decks, Google Docs, Sheets and Slides, and plain text and code files. Use the plus button in the lower-left corner of the chat box and choose Add photos and files, drag and drop, or paste a copied image straight in.
Free versus paid: the connector line
The Go app itself works on the free plan. The line Grammarly draws is connectors. Connectors let Go pull in context from apps such as Gmail, Outlook and Calendar, Slack, Salesforce, Superhuman Docs, Notion and Zoom, and Grammarly's FAQ says they're available only on paid, Pro-level subscriptions.
So on the free plan, Go knows what's on the page and what you upload. On a paid plan, it can reach into your inbox and calendar to draft a reply or prep a meeting. Grammarly's help page doesn't list a separate price for Go on its own, and I'm not going to guess one. It's part of Superhuman Pro, and Grammarly says you can also reach it through an existing Grammarly subscription.
When you add a connector, the Connectors list lets you click any app to see what it can do and what data it uses before you press Sign in. Read that screen. It's where you find out what you're about to hand over.
What Go does on a page
Depending on where you're working, Grammarly says Go can:
- Underline content that may need your attention before you share it.
- Respond to text you highlight, without you losing your place.
- Chat about the page in front of you.
- Label emails that need a response or a follow-up.
The examples in the help centre are refreshingly ordinary: explain a complex passage in simpler terms, summarise the key decisions in a long thread, build a daily briefing of finished, in-progress and priority work, prep for a meeting from your notes, draft an email reply, or make a message clearer, shorter or a better tone for a client. You review every suggestion and accept, edit or ignore it.
Go also runs in the cloud. Start a task, close the tab, and it keeps working in the background. It tells you when a job's done, or when it needs more information or your approval, and puts anything for review on your task list. The left panel holds your agents, your recent tasks and your connectors, and you can install more agents from the Agent Store or build your own. The Humanizer agent is in Go too, if you want AI drafts to sound more like you.
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Billing and cancelling Go
Because Go comes through Superhuman or Grammarly, there's no separate Go subscription to hunt for. Grammarly's cancellation guide adds one line that's easy to miss: if you're a Superhuman user, cancelling through your associated Grammarly account applies across all the other apps in the Superhuman suite. So cancelling Grammarly to stop paying for writing checks can switch off your paid Go connectors as well.
Where I'd start with Go
I'd try it on one real document first: a long proposal or a client thread you need to get through this week. Highlight a section, ask for the key decisions, then ask for a reply in your tone, and see whether it saves you time. Skip connecting your inbox until you've read what each connector can reach, and when you do connect, start with one app rather than five.
If your team already lives in Grammarly, Go is the lowest-effort AI assistant to trial, because you're flipping a setting rather than rolling out a new tool. If you're still learning the basics, start with how to use Grammarly day to day, then add Go. And if what you're after is a different email app, here's a look at alternatives to Superhuman.
Features shift quickly here, so check Grammarly's own Superhuman Go app guide for the latest; everything above is as of Nov 2026.
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Frequently asked questions
Is Superhuman Go free?
The Go app works on Superhuman Free, file uploads included. Connectors to apps like Gmail, Slack and Zoom need a paid, Pro-level subscription.
Do I need to install anything new to use Go with Grammarly?
No. In your Grammarly extension or desktop app settings, switch on Use Superhuman Go.
What's the file size limit in Superhuman Go?
Up to 7 MB for images and up to 30 MB for other files, with up to 5 files per chat, as of Nov 2026.
Does Go keep working if I close the tab?
Yes. Go runs in the cloud, so tasks continue in the background and you can pick them up on other devices.
Will cancelling Grammarly cancel Superhuman Go?
If you're a Superhuman user, cancelling through your associated Grammarly account applies across all the other Superhuman suite apps.
