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Email Marketing Comparison

Campaign Monitor vs. Postmark

At a glance

At a glance

Campaign Monitor

Best for

Best for marketing teams and agencies that want a polished drag-and-drop builder, prebuilt journeys and a large integration catalogue.

  • 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 Campaign Monitor Postmark
Starting price Not stated 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 for up to 500 contacts on a 30-day trial, with a 500 email send limit Free tier: 100 emails per month, no overages permitted, never expires
API Yes, API access with 250+ 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 campaigns and newsletters, with a website builder available as a paid add-on Transactional and broadcast email on separate Message Streams, plus inbound email processing that delivers received mail to your application
Automation and journeys Yes, prebuilt customer journeys and drip campaigns, with unlimited automated emails on Essentials and above 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, with advanced engagement segments on the Premier plan 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, a drag-and-drop builder with 100+ responsive templates and support for custom-coded templates 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, link review, and design and spam testing 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, CRM and ecommerce connections among the 250+ 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, API access with 250+ integrations 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, 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

  • Free trial Campaign Monitor Free plan for up to 500 contacts on a 30-day trial, with a 500 email send limit Postmark Free tier: 100 emails per month, no overages permitted, never expires
  • Support Campaign Monitor Email helpdesk, Phone Postmark Email helpdesk
  • AI features Campaign Monitor Yes Postmark No
  • API Campaign Monitor Yes, API access with 250+ integrations Postmark Yes, REST API and an SMTP service, with official libraries for TypeScript, Node.js, Python, Ruby, PHP, .NET and Java
  • Campaign types Campaign Monitor Yes, email campaigns and newsletters, with a website builder available as a paid add-on Postmark Transactional and broadcast email on separate Message Streams, plus inbound email processing that delivers received mail to your application

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

The trade-offs

Strengths and Limitations

Campaign Monitor

Strengths

  • Drag-and-drop builder with 100+ responsive templates and custom-coded templates
  • Prebuilt customer journeys and drip campaigns
  • AI Writer, AI Email Booster and AI Segment Mapper
  • 250+ integrations, including CRM and ecommerce, with an API

Limitations

  • Advanced engagement segments are reserved for the Premier plan
  • The website builder is a paid add-on

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

Campaign Monitor

  • Free $0 / month Up to 500 contacts on a 30-day trial, with a 500 email send limit; no credit card required.
  • Lite Not stated Core email tools with up to 2,500 monthly sends.
  • Essentials Not stated Unlimited monthly sends and priority support.
  • Premier Not stated Unlimited monthly sends, advanced engagement segments and phone support.
  • Enterprise Not stated Custom pricing on annual contracts with a dedicated account manager.
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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.
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What users say

Review Scores · opens after launch

Campaign Monitor

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

Campaign Monitor https://www.campaignmonitor.com · checked against the official source on 2026-08-21

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.