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Email Marketing Comparison

Iterable vs. Postmark

At a glance

At a glance

Iterable

Best for

Best for enterprise marketing teams running email together with mobile channels such as in-app, Mobile Inbox and embedded messages.

  • 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 Iterable 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 Not stated Free tier: 100 emails per month, no overages permitted, never expires
API Yes, a REST API for lists, events, user data, revenue tracking and campaign triggers, with native SDKs for Android, iOS and React Native 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)
Made in United States Not stated
Campaign types Yes, email, SMS, push notifications, web push, in-app messages, Mobile Inbox and embedded messages Transactional and broadcast email on separate Message Streams, plus inbound email processing that delivers received mail to your application
Automation and journeys Yes, cross-channel journeys and workflows with milestones synchronised across touchpoints, plus Nova Agents for journey optimisation 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, real-time audience segmentation on behavioural, product and engagement data, with Nova Decisioning for next best action 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, five template types covering email, in-app, push, SMS and web push, with an optional WYSIWYG editor alongside the standard editors 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, spam reports to test whether messages land in the inbox, plus A/B and multivariate experimentation 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, unifies behavioural, product and engagement data into customer profiles 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 REST API for lists, event data, user updates, revenue tracking and campaign triggers, with native SDKs for Android, iOS and React Native 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 Not stated Email helpdesk
Onboarding Documentation and knowledge base Documentation and knowledge base
Company size Enterprise more entries 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

  • Company size Iterable Enterprise Postmark Freelancers, Small and mid-sized, Enterprise
  • AI features Iterable Yes Postmark No
  • API Iterable Yes, a REST API for lists, events, user data, revenue tracking and campaign triggers, with native SDKs for Android, iOS and React Native Postmark Yes, REST API and an SMTP service, with official libraries for TypeScript, Node.js, Python, Ruby, PHP, .NET and Java
  • Campaign types Iterable Yes, email, SMS, push notifications, web push, in-app messages, Mobile Inbox and embedded messages Postmark Transactional and broadcast email on separate Message Streams, plus inbound email processing that delivers received mail to your application
  • Automation and journeys Iterable Yes, cross-channel journeys and workflows with milestones synchronised across touchpoints, plus Nova Agents for journey optimisation Postmark 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.

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

The trade-offs

Strengths and Limitations

Iterable

Strengths

  • Mobile Inbox and embedded messages sit alongside email, SMS, push and web push
  • Real-time segmentation with A/B and multivariate experimentation
  • Nova agents automate audience building and journey optimisation
  • REST API plus native SDKs for Android, iOS and React Native

Limitations

  • No published pricing, every tier is quoted by sales
  • Positioned for enterprise scale rather than small lists
  • The WYSIWYG editor is a project setting rather than the default

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

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

Iterable

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

Iterable https://iterable.com · checked against the official source on 2026-09-03

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.