What AI email marketing tools do in 2026: generate designs, draft automations, audit programs and let agents operate your ESP. Tools compared by job.
Brew publishes this comparison. We reviewed the linked product documentation on September 28, 2026; this is a documentation comparison, not a claim of hands-on testing of every platform. Check current plan limits on the vendor's pricing page.
You click the AI button in your email platform and ask for next week's campaign, and it returns five subject lines. The layout, the copy and the images are still yours to build, block by block, in the editor.
The label "AI-powered" is on nearly every email platform's homepage, and it means something different in each. In one product it means that subject-line suggestion. In another, an agent drafts a whole campaign in your brand, builds the audience and schedules the send for your approval.
This guide sorts AI email tools by the job the AI does and names the tools that do each job. It also explains how to test them on your own work. It covers three jobs: designing the email, building the automation, and letting an agent operate the platform.
| Job | What the AI produces | Tools that do it |
|---|---|---|
| Design | A complete email, meaning layout, copy and images, that matches your brand | Brew, Klaviyo Composer, Stripo AI Assistant, Email Love AI Studio |
| Automation | A triggered flow with emails, waits and branches | Brew, Sequenzy, Resend Automations, Klaviyo Composer |
| Agent operation | Actions in your account: create, send, schedule, segment, report | MCP servers from Brew, Klaviyo, HubSpot, Customer.io, Brevo, Loops, Resend, Sequenzy |
We checked each vendor's own documentation and pricing on September 28, 2026. Features change often in this category, so confirm the details on the vendor's pages before you buy.
Brew is an email platform built around AI generation. It reads your website and any brand files you upload, writes an editable brand document called email-design.md, and generates complete emails from a prompt onto a canvas. It also builds automations from a description, or by published example sequences in its flows gallery. Brew sends from your verified domain or exports templates to supported email platforms.
For agents, Brew's MCP server exposes design, sending and scheduling, automations, audiences and analytics. Live sends require confirmation on OAuth and organization connections; a brand API-key client needs its own approval policy.
Brew's plans are Free (500 AI credits and 1,000 sends a month, with a Brew watermark), Growth at $99 a month, Pro at $249 a month, and Enterprise. Every plan includes every feature. See pricing.
Brew is email only, with no SMS or push. Event conditions can read the original payload or current Brew contact fields through contact.<name>. Put contact conditions after waits and keep those fields synced. For unsynced application state or invoice-specific eligibility, check the authoritative record in your application before firing a reminder event. See the automation guide.
Composer is Klaviyo's AI marketing agent. It audits your account's flows, campaigns, segments and forms and returns prioritized fixes. It also creates email, SMS and push campaigns, flows with their messages, and segments from a plain-language goal. It drafts from your configured brand voice, colors and fonts and your send history, and it never sends or publishes without your approval.
Klaviyo's MCP server extends this to Claude, Cursor and other clients, with more than 260 tools. It fits ecommerce brands whose data already lives in Klaviyo.
Customer.io lists an AI Agent in beta and AI-generated global styles in Design Studio on its pricing page. Its MCP server gives assistants access to its Journeys and Data Pipelines APIs. Read, write and delete are separate tools, and access is read-only by default. It fits multi-channel lifecycle teams with a mature data model.
Mailchimp includes its Intuit Assist AI features on the Standard plan and above, according to its pricing page. It also offers a Claude connector that plans and builds campaigns from your Mailchimp performance data. Its official MCP server covers Mailchimp Transactional. It fits existing Mailchimp users who want AI help without moving.
HubSpot's remote MCP server connects assistants to CRM records and marketing email. Its September 15, 2026 changelog adds creating drafts, configuring send details, scheduling, publishing and post-send analytics for marketing email. It fits teams whose CRM and email already live in HubSpot.
Sequenzy generates email sequences from your website content. Its sequences are billing-aware. Stripe activity becomes events like saas.trial_will_end, and each sequence has one stop condition checked before every step. It also generates subject lines and SMS text through its API and has an MCP server. Pricing is per email, with a free tier of 2,500 emails a month.
You can build Resend's Automations, generally available since April 2026, from a plain-language description. Resend supports React Email templates and a visual editor for Templates and Broadcasts. It fits developer-led teams already sending through Resend.
Stripo is a template editor with an AI Assistant that writes copy, suggests structure and builds sections from email-safe modules using your Brand Kit. It does not send campaigns. You export to your ESP or as HTML. Paid plans start at $20 a month.
Run the same test on every tool you shortlist:
The deciding question is usually how much work is left after the AI finishes. A tool that gives you a sendable first draft of the full email saves more time than one that suggests a subject line.
Generated promotional mail is commercial mail. It needs an honest subject, a physical address and a working unsubscribe under CAN-SPAM. Bulk senders must authenticate and keep spam complaints below the thresholds in Gmail's sender requirements. When an agent sends from your domain, you are the sender under these rules. What still applies when an agent sends covers the details.
