Best for
Best for small businesses that want an email marketing platform with templates, automation and an AI content generator, and phone support to get started.
- Freelancers
- Small and mid-sized
Email Marketing Comparison
Constant Contact vs. Postmark
At a glance
At a glance
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 | Constant Contact | Postmark |
|---|---|---|
| Starting price | lower value From $12 / month Lite plan; the price scales with the number of contacts. Prepaying for 12 months saves up to 15 percent. | 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 trial available, no credit card required | Free tier: 100 emails per month, no overages permitted, never expires |
| API | Yes, a v3 REST API for contacts and email campaigns with webhooks and OAuth 2.0 | 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 campaigns, with 500 SMS messages a month and social posts on the Premium plan | Transactional and broadcast email on separate Message Streams, plus inbound email processing that delivers received mail to your application |
| Automation and journeys | Yes, automation templates, one on Lite, three on Standard and unlimited custom automations on 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, ten custom segments on Standard and unlimited custom segments with dynamic content 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, an email editor with templates and an AI content generator | 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, subject line A/B testing and automatic resend to non-openers on Standard and Premium | 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, contact management with integrations, plus revenue reporting on the Premium plan | 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 v3 REST API for contacts and email campaigns with webhooks and OAuth 2.0 | 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 Phone, Chat | Email helpdesk |
| Onboarding | Not stated | Documentation and knowledge base |
| Company size | Freelancers, Small and mid-sized | more entries Freelancers, Small and mid-sized, Enterprise |
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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 Constant Contact From $12 / month Postmark Free tier; Basic from $15 / month
- Free trial Constant Contact Free trial available, no credit card required Postmark Free tier: 100 emails per month, no overages permitted, never expires
- Company size Constant Contact Freelancers, Small and mid-sized Postmark Freelancers, Small and mid-sized, Enterprise
- Support Constant Contact Phone, Chat Postmark Email helpdesk
- AI features Constant Contact Yes Postmark No
Every line is one datapoint from the table above, picked automatically. Nothing here is written text.
The trade-offs
Strengths and Limitations
Constant Contact
Strengths
- AI content generator for on-brand emails, texts and social posts
- Automatic resend to non-openers and subject line A/B testing on the paid plans
- v3 REST API with webhooks and OAuth 2.0
- Prepaying for 12 months saves up to 15 percent
Limitations
- Prices scale with the number of contacts
- The Lite plan is limited to one user and one automation template
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
Constant Contact
- Lite From $12 / month One user, one automation template and basic reporting, with monthly sends up to 10x the number of contacts. Scales with contacts.
- Standard From $35 / month Three users, email scheduling, subject line A/B testing, resend to non-openers, three automation templates, AI campaign building and ten custom segments.
- Premium From $80 / month Unlimited users, unlimited custom automations and segments, dynamic content, revenue reporting, dedicated support and 500 SMS messages a month.
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.
What users say
Review Scores · opens after launch
Constant Contact
- 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
Constant Contact https://www.constantcontact.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.