EmailOctopus vs. Postmark

At a glance

Best for

Best for creators and small businesses that want low-cost newsletters, automation and landing pages without paying for features they will not use.

Freelancers
Small and mid-sized

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	EmailOctopus	Postmark
Starting price	lower value From $9 / month Pro plan, billed yearly; the price scales with the number of subscribers. A free Starter plan covers up to 2,500 subscribers and 10,000 emails per month.	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 Starter plan for up to 2,500 subscribers and 10,000 emails per month, with EmailOctopus branding	Free tier: 100 emails per month, no overages permitted, never expires
API	Yes, a public API to manage lists, contacts, campaigns and automations	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 scheduled sending	Transactional and broadcast email on separate Message Streams, plus inbound email processing that delivers received mail to your application
Automation and journeys	Yes, automated sequences that engage subscribers based on triggers	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 using custom fields and tags	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 editor with auto-generating templates that adapt to your colours	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, with over a decade of email delivery experience and real-time open and click reporting	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	Through integrations rather than a built-in sync: an official WordPress plugin for sign-up forms, and Zapier for the rest, with Shopify connected that way	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 public API for lists, contacts, campaigns and automations, plus over 1,000 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.
Deployment	Cloud (SaaS), Browser-based	Cloud (SaaS), Browser-based
Support	Not stated	Email helpdesk
Onboarding	more entries Documentation and knowledge base, Video tutorials	Documentation and knowledge base
Company size	Freelancers, Small and mid-sized	more entries Freelancers, Small and mid-sized, Enterprise
Integrations	Zapier, WordPress, Shopify	Not stated

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 EmailOctopus From $9 / month Postmark Free tier; Basic from $15 / month
Free trial EmailOctopus Free Starter plan for up to 2,500 subscribers and 10,000 emails per month, with EmailOctopus branding Postmark Free tier: 100 emails per month, no overages permitted, never expires
Company size EmailOctopus Freelancers, Small and mid-sized Postmark Freelancers, Small and mid-sized, Enterprise
API EmailOctopus Yes, a public API to manage lists, contacts, campaigns and automations Postmark Yes, REST API and an SMTP service, with official libraries for TypeScript, Node.js, Python, Ruby, PHP, .NET and Java
Campaign types EmailOctopus Yes, email newsletters and campaigns, with scheduled sending 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

EmailOctopus

Strengths

Generous free plan for up to 2,500 subscribers and 10,000 emails per month
Low-cost Pro plan from $9 per month
Automation, tag-based segmentation, and landing pages and forms
Public API and over 1,000 integrations

Limitations

The free plan carries EmailOctopus branding
The lowest Pro price is billed yearly

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

EmailOctopus

Starter $0 / month Up to 2,500 subscribers and 10,000 emails per month, with EmailOctopus branding.
Pro From $9 / month Billed yearly; removes branding and adds custom email design, unlimited landing pages, forms and reports. The price scales with the number of subscribers.

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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

EmailOctopus

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

EmailOctopus https://emailoctopus.com · checked against the official source on 2026-08-22

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.