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July 2026 · Available on all plans.
Historical note · July 2026 · Describes Brew as of July 2026. For current behavior, see Preview in Real Inboxes.

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What Shipped

Brew can now render any design across real email clients and devices (Gmail, Outlook, Apple Mail, iOS with dark-mode variants, and Yahoo). It returns a screenshot per client. Catch a broken Outlook table or a dark-mode contrast issue before the send goes out.
Inbox previews rendered from a chat prompt in Brew

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How to Use It

1

Add the email to chat

Open the email you want to check and click Add to chat. This brings that design into the conversation so the preview runs against it.
2

Ask for a preview

Prompt the chat for a preview. Name specific inboxes if you have them in mind:
“Preview this across real inboxes.”
“Preview this in Gmail mobile and Apple Mail dark mode.”
Leave it open-ended and Brew runs a default spread of Gmail, Outlook, Apple Mail, and iOS.
3

Open the full renders

Preview images come back per client in the chat. Click any of them to open the full-size render in a new tab. Slow clients show as Pending; ask again to fetch just those.

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From MCP

If Brew is connected to your AI client, previews run from any chat. Reference the email you want checked and ask:
“Preview the launch email in Apple Mail and Gmail.”
The agent calls preview_email_across_clients and replies with the preview images, hosted on Brew’s CDN. Click any of them to open the full-size render in your browser.
Claude running a Brew inbox preview over MCP, returning Apple Mail and Gmail renders

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From the API

The same feature is available at POST /v1/emails/{emailId}/client-previews and as brew.emails.previewClients(...) in the TypeScript SDK. See the API Reference for the full client catalogue.