CataleoSoftware
Get Your Software Listed Get Listed

Email Marketing Comparison

Mailchimp vs. Postmark

At a glance

At a glance

Mailchimp

Best for

Best for teams that want an email marketing platform with designed templates, automation and AI writing tools, and a Marketing API to connect their own data.

  • Freelancers
  • Small and mid-sized
  • Enterprise

Postmark

Best for

Best for product and engineering teams whose transactional email has to arrive, and who want promotional sending kept on separate infrastructure.

  • Freelancers
  • Small and mid-sized
  • Enterprise

Cataleo does not name a winner. Both statements come from the vendors themselves.

Full Comparison

Criterion Mailchimp Postmark
Starting price lower value From $13 / month Essentials plan; the price scales with the number of contacts. Free tier; Basic from $15 / month All three paid plans start at 10,000 emails per month and differ mainly by overage rate: Basic $15 at $1.80 per 1,000 extra emails, Pro $16.50 at $1.30, Platform $18 at $1.20.
Free trial Free plan available for up to 500 contacts Free tier: 100 emails per month, no overages permitted, never expires
API Yes, a Marketing API for audiences, automations and data sync, plus more than 300 integrations Yes, REST API and an SMTP service, with official libraries for TypeScript, Node.js, Python, Ruby, PHP, .NET and Java
Hosting Cloud (SaaS) Cloud (SaaS)
Campaign types Yes, email newsletters and campaigns, with A/B testing and scheduling on paid plans Transactional and broadcast email on separate Message Streams, plus inbound email processing that delivers received mail to your application
Automation and journeys Yes, automation flows, up to 3 steps on Essentials and up to 200 flows on Standard and Premium No journey or automation builder. Sends are triggered by your own application over the API or SMTP, and delivery events are pushed back out through webhooks.
Segmentation and personalisation Yes, segmentation and dynamic content, with predictive segmentation on Premium No stored audiences or segment builder. Recipients and their personalisation values are supplied per request, while Postmark maintains bounce state and suppression lists.
Templates and editor Yes, professionally designed templates and an editor, with custom-coded templates on Premium Reusable email templates with variable substitution, managed in the dashboard or over the Templates API; there is no drag-and-drop campaign designer
Deliverability and testing Yes, A/B testing and scheduling on paid plans Message Streams keep promotional sending on infrastructure separate from transactional mail. Message data is retained for 45 days, extendable to 365 days on Pro and Platform from $5 per month. Dedicated IPs start at $50 per month per IP and DMARC monitoring at $14 per month per domain.
Ecommerce and CRM data Yes, audience data with tags and more than 300 integrations No built-in ecommerce or CRM data sync. Contact data stays in your own application, which supplies it with each send.
Integrations and API Yes, a Marketing API for audiences, automations and data sync Yes, REST API with separate server and account tokens over TLS, plus an SMTP service with IP allowlisting. Endpoints cover email, batch sending, templates, bounces, inbound, message streams and suppressions. Official libraries for TypeScript, Node.js, Python, Ruby, Rails, PHP, .NET and Java, plus a WordPress plugin; community libraries add Go, Elixir, Laravel and Scala.
AI features stated Yes No
Deployment Cloud (SaaS), Browser-based Cloud (SaaS), Browser-based
Support more entries Email helpdesk, Chat, Phone Email helpdesk
Onboarding Not stated Documentation and knowledge base
Company size Freelancers, Small and mid-sized, Enterprise Freelancers, Small and mid-sized, Enterprise

Compare more tools

Row where the values differ The small markers point at the lower number, the longer list or the stated feature. They describe the data, they are not a verdict.

The short version

Key Differences

  • Starting price Mailchimp From $13 / month Postmark Free tier; Basic from $15 / month
  • Free trial Mailchimp Free plan available for up to 500 contacts Postmark Free tier: 100 emails per month, no overages permitted, never expires
  • Support Mailchimp Email helpdesk, Chat, Phone Postmark Email helpdesk
  • AI features Mailchimp Yes Postmark No
  • API Mailchimp Yes, a Marketing API for audiences, automations and data sync, plus more than 300 integrations Postmark Yes, REST API and an SMTP service, with official libraries for TypeScript, Node.js, Python, Ruby, PHP, .NET and Java

Every line is one datapoint from the table above, picked automatically. Nothing here is written text.

The trade-offs

Strengths and Limitations

Mailchimp

Strengths

  • Generative AI writing and design tools on the Standard and Premium plans
  • Marketing API with webhooks and OAuth 2 for audiences and automations
  • More than 300 integrations
  • Free plan for up to 500 contacts

Limitations

  • Prices scale with the number of contacts
  • Predictive segmentation and custom-coded templates are reserved for the top plans

Postmark

Strengths

  • Message Streams keep promotional sending on infrastructure separate from transactional mail
  • Standing free tier of 100 emails a month that never expires
  • Official client libraries for eight languages plus a WordPress plugin
  • Inbound email processing on the Pro and Platform plans
  • Message data retention extendable from 45 days to 365 days on Pro and Platform

Limitations

  • No automation, journey builder or stored audiences
  • Inbound email is not included on the Free and Basic plans
  • Dedicated IPs, extended retention and DMARC monitoring are priced as add-ons
  • The free tier permits no overage, so sending stops at 100 emails
  • All three paid plans start at the same 10,000 emails, so the choice is really about overage rate

Plans

Pricing

Mailchimp

  • Free $0 / month Up to 500 monthly sends and 250 contacts, with a limited set of templates.
  • Essentials From $13 / month Designed templates, A/B testing, scheduling and up to 3 automation flow steps. Scales with contacts.
  • Standard From $20 / month Adds AI writing and design tools and up to 200 automation flows. Scales with contacts.
  • Premium From $350 / month Adds unlimited contacts and seats, predictive segmentation, phone and priority support and custom-coded templates.
Visit site

Postmark

  • Free $0 100 emails per month with no overages permitted, and 45 days of data retention. Never expires.
  • Basic $15 Per month from 10,000 emails, overage $1.80 per 1,000. 45 days of data retention, no inbound email.
  • Pro $16.50 Per month from 10,000 emails, overage $1.30 per 1,000. Adds inbound email and data retention customisable to 365 days.
  • Platform $18 Per month from 10,000 emails, overage $1.20 per 1,000. Adds unlimited custom domains and message streams.
Visit site

What users say

Review Scores · opens after launch

Mailchimp

Ease of use
Not rated yet
User interface
Not rated yet
Onboarding
Not rated yet
Support and service
Not rated yet
Value for money
Not rated yet
Features
Not rated yet

No reviews yet. Be the first to review this tool. Every review is checked for fairness before it appears, and the vendor cannot have one removed.

Postmark

Ease of use
Not rated yet
User interface
Not rated yet
Onboarding
Not rated yet
Support and service
Not rated yet
Value for money
Not rated yet
Features
Not rated yet

No reviews yet. Be the first to review this tool. Every review is checked for fairness before it appears, and the vendor cannot have one removed.

Where this comes from

Where this comes from

Mailchimp https://mailchimp.com · checked against the official source on 2026-08-19

Postmark https://postmarkapp.com · checked against the official source on 2026-09-09

This table lists factual criteria taken from information the vendors publish themselves. For how we put it together, see the methodology.