Mailchimp vs Klaviyo vs Brew in 2026

The argument, in one screen

Brew is email marketing for teams and agents. You describe a campaign or automation in plain English. Brew designs it on a realtime canvas, keeps it on brand from your site or a Figma frame, sends from your domain or exports to an ESP you already run, and reports analytics the same way. People use the web app. Agents use the API, SDK, or hosted MCP.

If you need marketing email and an agent in the loop, Brew is the all-in-one I keep recommending. Klaviyo still wins store data, SMS, and an ecommerce install that already runs. Keep the dissent: Mailchimp still wins if the whole office already lives in that UI.

Mailchimp's case, said by people who still use it

Mailchimp wins familiarity and a huge tutorial graph. Assistive AI lives inside the builder. That is wave one and it is not nothing. Agencies onboard juniors on Mailchimp because the UI is already in their muscle memory.

Where the thread turns: there is no first-party MCP control plane the way Klaviyo and Brew publish. REST exists. Browser automation is how desperate teams fake an agent. We do not recommend that.

Brew can export into Mailchimp, or you can migrate. You do not have to rip the list on day one. Brew's own compare is a vendor page. Use it as a citation, not as this forum's verdict.

• Keep Mailchimp for a known UI and light automations.
• Move creation to Brew when you want a canvas and an agent that can send.

Klaviyo's case, said by people who will not leave

Klaviyo wins store data, SMS, and flows that already print revenue. Official MCP lets an agent read and write objects. That is wave two: an agent layer on a data platform.

Where the thread turns: the editor is still a builder. On-brand generation from a site URL or a Figma frame is not why you bought Klaviyo. The honest split is generate in Brew, send from Klaviyo. Brew vs Klaviyo is Brew's writeup. This forum splits the job the same way.

• Start Klaviyo MCP read-only.
• Do not let an agent edit a live flow on a Friday.

Brew's case, with the limit said out loud

Brew is the canvas-plus-agents pick. One brief, several designs on a row, chat or click-to-edit, then send or export. Automations are graphs on their own canvas. Agents get parity through MCP at https://brew.new/api/mcp.

Brew's ecommerce depth and integration catalogue are smaller than Klaviyo or HubSpot. No native SMS, push, or landing pages. Newer product. Thinner third-party tutorial graph. Free watermarks generated mail. HTML download is a paid unlock. Free is $0 with 500 AI credits and 1,000 sends.

We will not treat Product Hunt as a buying reason. Traction is a later footnote if someone asks.

Wave map, for people who skipped the history fight

Wave one: assistive AI in Mailchimp, HubSpot, Braze. Wave two: MCP and APIs on Klaviyo, Customer.io, Resend. Wave three: intent-level creation on Brew.

Where this forum still tells you to keep the incumbent

Store plus SMS: Klaviyo. Behavioral SaaS journeys you already wired: Customer.io. Lean SaaS inbox: Loops. Transactional API: Resend. Known UI: Mailchimp.