A free plan and a website builder against social posts and events in one account.
Choose Mailchimp if you want a free plan to start, a website builder next to your email, and SMS outside the US.
Choose Constant Contact if you want social posting and event registration next to your email, and unsubscribed contacts left off your bill.
Choose Brew if you want a fully agentic setup, where your AI agent drives lifecycle marketing to engage and retain customers. Brew designs every email from your brand and runs your automations agentically.
THE BROWSERCOMPANY
Brew is the third column, for teams that want an agent to design and send their email.
| Mailchimp | Constant Contact |  Brew | |
|---|---|---|---|
| Key differences | |||
| Billed on | Mailchimp: Contacts, counted once per audience | Constant Contact: Active contacts, with sends capped at a multiple | Brew: Emails sent and AI credits |
| Fully agentic | Mailchimp: Partly. Partly: AI assists with copy; your team does the work in the app | Constant Contact: Partly. Partly: AI drafts campaigns; your team finishes them in the app | Brew: Yes. Your agent designs, sends and runs automations end to end |
| Designs finished, on-brand emails | Mailchimp: No. Writes copy and subject lines; you design each email | Constant Contact: Partly. Partly: Builds a branded draft that you finish in the editor | Brew: Yes. Layout, copy and images from your brand, ready to send |
| Your agent takes it live | Mailchimp: No. Claude and ChatGPT connectors draft; you finish and send in Mailchimp | Constant Contact: Partly. Partly: ChatGPT app drafts; a separate transactional MCP can send | Brew: Yes. Sends, schedules and runs automations; OAuth and org-scoped MCP require confirmation, brand API keys do not |
| Automations on the cheaper plans | Mailchimp: Partly. Partly: Up to 4 steps on Essentials; none on Free | Constant Contact: Partly. Partly: Templates on Lite and Standard; custom paths on Premium | Brew: Yes. No step or flow limits on any plan |
| Landing pages, websites and events | Mailchimp: Yes. Landing pages and a website builder | Constant Contact: Yes. Event registration, payments and landing pages | Brew: No. Email only |
| Mailchimp | Constant Contact | Brew | |
|---|---|---|---|
| Creating emails | |||
| Remembers your brand for every email | Mailchimp: Partly. Partly: Brand kit takes colors and fonts from your site; logos by hand | Constant Contact: Yes. BrandKit scans your site for logo, colors and fonts | Brew: Yes. Brand files your agent reads every time |
| Visual editor | Mailchimp: Yes. Drag-and-drop builder with 250+ templates | Constant Contact: Yes. Drag-and-drop editor and email templates | Brew: Yes. Infinite canvas, edit by hand or in chat |
| Bring the emails you already have | Mailchimp: Partly. Partly: Custom-coded templates; sending them needs Standard | Constant Contact: Yes. Custom code editor for your own HTML | Brew: Yes. HTML, MJML, React Email, Figma or a forwarded email |
| Automation | |||
| Event-triggered automations | Mailchimp: Yes. Signups, store activity and dates | Constant Contact: Yes. Contact activity, store activity and dates | Brew: Yes. Stripe, Shopify, Clerk, Supabase or your own events |
| Channels | |||
| Email from your own domain | Mailchimp: Partly. Partly: Marketing; transactional is a paid add-on from Standard | Constant Contact: Partly. Partly: Marketing; transactional through a separate API | Brew: Yes. Marketing and transactional on every plan |
| SMS | Mailchimp: Yes. Paid add-on in the US, Canada, UK, Australia and parts of Europe | Constant Contact: Yes. US only; on Premium, add-on from $10/month | Brew: No. Email only |
| Agents and developers | |||
| MCP server for AI agents | Mailchimp: Partly. Partly: Searches the docs; a separate one for transactional email | Constant Contact: Partly. Partly: Only on its separate transactional email API | Brew: Yes. Every Brew tool, in Claude, ChatGPT, Cursor and Grok |
| Works in Claude and ChatGPT | Mailchimp: Partly. Partly: Connectors draft campaigns, Standard and up | Constant Contact: Partly. Partly: ChatGPT app drafts campaigns you send in the app | Brew: Yes. Designs, sends and runs automations from the chat |
| API | Mailchimp: Yes. Marketing API and webhooks | Constant Contact: Yes. V3 API and SDKs | Brew: Yes. REST API, typed SDK and CLI |
| Pricing | |||
| Unlimited contacts | Mailchimp: No. Priced by contacts, unsubscribed ones included | Constant Contact: No. Priced by active contacts; unsubscribes don’t count | Brew: Yes. On every plan; you pay for sends |
| Getting started | Mailchimp: Free plan: 250 contacts, 500 sends a month | Constant Contact: 30-day free trial | Brew: Free trial with 500 AI credits and 1,000 sends |
| First paid plan | Mailchimp: Essentials, from $13/month for 500 contacts; no AI features | Constant Contact: Lite, from $12/month for 500 contacts; sends up to 10x contacts | Brew: Growth, $99/month: 10,000 AI credits and 50,000 sends |
| Next plan | Mailchimp: Standard, from $20/month for 500 contacts; adds AI and longer flows | Constant Contact: Standard, from $35/month for 500 contacts; adds AI campaign builder | Brew: Pro, $249/month: 25,000 AI credits and 200,000 sends |
| Top plan | Mailchimp: Premium, from $350/month for 10,000 contacts: phone support and SSO | Constant Contact: Premium, from $80/month for 500 contacts: custom automations and SMS | Brew: Enterprise: custom volume and a dedicated account manager |
| Security and compliance | |||
| SOC 2 | Mailchimp: Yes. SOC 2 reports and ISO 27001 | Constant Contact: Yes. SOC 2 report on request | Brew: No. Not yet; security review and DPA on request |
Neither designs a finished, on-brand email. Mailchimp’s AI writes copy and subject lines; Constant Contact’s AI builds a branded draft that you finish in the editor.
Teams that move to Brew tell us AI drafts from tools like these rarely look like their brand, so someone still redesigns them.
Both price on the size of your list, so contacts you rarely email still cost money.
At 500 contacts, Constant Contact Lite starts at $12/month and Mailchimp Essentials at $13/month. One plan up, Mailchimp Standard is $20/month and Constant Contact Standard $35/month; both add AI features at that level. Constant Contact Premium, with custom automations and SMS, starts at $80/month for 500 contacts; Mailchimp Premium starts at $350/month for 10,000 contacts.
Mailchimp counts unsubscribed contacts, once for every audience they are in, and has a free plan for 250 contacts. Constant Contact bills active contacts and caps monthly sends at 10, 12 or 24 times your contacts, depending on the plan.
Brew bills on emails sent and AI credits, with unlimited contacts: Growth is $99/month for 50,000 sends and 10,000 AI credits.
Brew is fully agentic: your agent designs on-brand emails, sends them and runs your automations. Unlimited contacts on every plan. OAuth and organization-scoped MCP connections ask you to confirm live sends and launches. Brand-scoped API keys can execute permitted calls without the MCP confirmation step.
Connect Claude, ChatGPT, Cursor or Grok over MCP and your agent gets every Brew tool. It designs emails from your brand, builds audiences, runs automations and schedules sends. OAuth and organization-scoped MCP connections ask you to confirm live sends and launches. Brand-scoped API keys can execute permitted calls without the MCP confirmation step.
Paste your website and Brew writes your brand into two files your agent reads for every email. Describe the email and it appears on the canvas, ready to edit by hand or in chat.
We're here to help! Feel free to schedule a call.
Can't find what you're looking for? Contact us at +1-(332)-203-2145 or support@brew.new.
It depends on what else you want in the account. Constant Contact adds social posting to Facebook, Instagram and LinkedIn, and event registration with payments. Mailchimp adds a free plan, a website builder and product recommendations on every plan. Both have a drag-and-drop editor and automations triggered by store activity and dates.
At 500 contacts, Constant Contact Lite costs $12/month and Mailchimp Essentials $13/month. On the next plan Mailchimp costs less: Standard is $20/month against $35/month. Mailchimp also has a free plan for 250 contacts, but it counts unsubscribed contacts. Constant Contact does not, and caps monthly sends at a multiple of your contacts.
Constant Contact goes a little further on design: its AI builds a branded draft that you finish in the editor, from the Standard plan. Mailchimp’s AI writes copy, subject lines and preview text on Standard and up. Both connect to ChatGPT to draft campaigns that you send in the app, and Mailchimp also connects to Claude. Mailchimp’s MCP server searches its docs, and Constant Contact’s belongs to its separate transactional email API. Neither designs a finished, on-brand email; Brew does.
Brew, if you want an agent to run your email. Your agent designs finished, on-brand emails from your brand, sends them and runs your automations, with unlimited contacts on every plan. Brew is email only, so SMS, social posts, events and landing pages stay in another tool.
Yes. Connect Mailchimp in Brew and save any email as a Mailchimp template, ready for your campaigns and flows. For Constant Contact, export the finished email as HTML and paste it into its custom code editor.
Brew publishes this comparison. Brew Team reviewed the linked first-party documentation. This is a documentation review, not a claim of hands-on testing of every product. Pricing and plan limits can change.
Work at Mailchimp or Constant Contact? If anything on this page is wrong or out of date, email support@brew.new and we will correct it. We want to compete on the product, not on a mistaken comparison.
Updated October 2026
