Softwr

Marketing · head to head

Convert vs Postmark

Convert logo

Convert

Marketing

A/B testing platform for enterprises

From
Free
Rated
-
Full reviewWebsite
Postmark logo

Postmark

Marketing

No hidden fees, no guesswork. Just the features you need, at a price that makes sense

From
On request
Rated
-
Full reviewWebsite

The short version

  • Only Convert has a free tier, so it costs nothing to try first.
  • Each has a real cost: Convert pricing is driven by monthly tested users, starting at $399 per month for 100,000 monthly tested users on Growth and $599 on Pro; Postmark free tier caps at 100 emails per month with no overages allowed
  • Prices and features above were last checked on 2 September 2026.

Where they differ

Only the attributes on which Convert and Postmark actually diverge.

Attributes where Convert and Postmark differ
AttributeConvertPostmark
Starting priceFreeOn request
Pricing modelsubscriptionUnknown
Free tierYesNo
Founded2012Unknown

Identical on both: platforms (Web), user rating (Not yet rated), category (Marketing).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Convert

  • A/B testing
  • Multivariate testing
  • Analytics
  • API access
  • Google Analytics
  • SSL encryption
  • Cloud deployment
  • Web support

Only in Postmark

Nothing recorded that Convert does not also cover.

What people use each for

The jobs each tool is most often brought in to do.

Convert

  • A/B and multivariate testing for conversion optimizationnot Postmark
  • Full-stack experimentation on web and mobilenot Postmark
  • Sequential testing and statistical confidence trackingnot Postmark

Postmark

  • Sending password reset emails with industry-leading delivery speednot Convert
  • Processing inbound email replies into JSON objects for applicationsnot Convert
  • Tracking failed email deliveries and suppressing invalid addressesnot Convert
  • Separating transactional emails from marketing emails with message streamsnot Convert

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Convert

  • Pricing is driven by monthly tested users, starting at $399 per month for 100,000 monthly tested users on Growth and $599 on Pro
  • Single Sign-On requires the Pro plan at $599 per month
  • Multivariate testing, multi-page testing, full stack and feature flags, sequential testing and raw test data export are all withheld from the Growth plan
  • Phone support, change history and guided onboarding require Pro
  • The advertised $299 and $420 per month rates require paying the full year up front at $3,588 or $5,040
  • The Enterprise plan is price on request, is only available as an annual plan, and its data segregation feature carries additional costs
  • Listed prices exclude VAT, GST and other taxes, which are added at checkout
  • Above 5 million monthly tested users there is no published rate

Postmark

  • Free tier caps at 100 emails per month with no overages allowed
  • Basic plan ($15/mo) includes 10,000 emails then charges $1.80 per 1,000 extra; Pro and Platform tiers have their own lower per-1,000 overage rates ($1.30 and $1.20), so cost scales per email beyond the included volume
  • Custom high-volume pricing above the published tiers requires contacting sales

Pricing, plan by plan

Convert

Free
  • Growth$399/month
  • Pro$599/month
  • Enterprise$undefined/mo

Postmark

On request

No published plan breakdown. See the Postmark review.

Which should you pick?

Choose Convert if

  • You need a/b testing.
  • You want to start without paying.
  • You also want multivariate testing.
Convert review

Choose Postmark if

Nothing in the data separates Postmark from Convert on the points above - pick on price and on how each one feels to use.

Postmark review

Questions people ask

Is Convert or Postmark better?
Neither clearly leads. Convert starts at Free and Postmark at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Convert or Postmark?
Convert has a free tier; the other does not. Paid plans start at Free for Convert and On request for Postmark.
Does Convert or Postmark run on more platforms?
Both run on Web, so platform support will not decide this one for you.
Can I use Convert for free?
Yes. Convert has a free tier, so you can try it without paying. Postmark starts at On request.
What is Convert best used for?
Convert is most often used for a/b and multivariate testing for conversion optimization, full-stack experimentation on web and mobile, sequential testing and statistical confidence tracking. Of those, a/b and multivariate testing for conversion optimization and full-stack experimentation on web and mobile are not what Postmark is typically brought in for.
What can Convert do that Postmark cannot?
Convert covers A/B testing, Multivariate testing, Analytics, API access.

Answered from the vendors’ own pages

Convert: What is the starting price for Convert?

The Growth plan starts at $399/month (or $299/month billed annually for 25% savings) with 100K monthly tested users, 5 projects, and 5 active experiences per project.

Source
Postmark: What is the cheapest paid plan for Postmark email sending?

Postmark Basic plan is $15/month for 10,000 emails, with overages at $1.80 per 1,000 additional emails. Free tier limited to 100/month. No annual billing discount available. Source: https://www.postmarkapp.com/pricing

Source
Convert: What is the difference between Growth and Pro plans?

Both cap at 100K tested users/month, but Pro ($599/month or $420/month annual) adds 30 active projects (vs 5), unlimited experiences per project (vs 5), unlimited domains (vs 10), multivariate testing, full-stack testing, sequential testing, and phone support.

Source
Postmark: How are Postmark email overages calculated?

Overages are calculated at month-end and billed with your next plan cost. Basic tier overages: $1.80 per 1,000; Pro: $1.30 per 1,000; Platform: $1.20 per 1,000. Unused monthly emails do not carry over. Source: https://www.postmarkapp.com/pricing

Source
Convert: How much does the Enterprise plan cost?

Enterprise pricing is available 'on request.' It supports 1M+ monthly tested users (12M+ annually), unlimited projects, experiences, and domains, plus dedicated account manager and custom terms.

Source
Postmark: What payment methods does Postmark accept?

Postmark accepts Visa, MasterCard, American Express, Diners Club, and JCB. No PayPal or purchase orders accepted. Bootstrapped startups can request a $75 account credit. Source: https://www.postmarkapp.com/pricing

Source
Convert: What is the cost to exceed my monthly tested user limit?

Growth overages cost $399 per 100K additional users. Pro/Enterprise overages cost $699 per 250K additional users. Customers can also upgrade mid-cycle at any time.

Source
Postmark: Can I get a dedicated IP on Postmark without high volume?

No. Postmark dedicated IPs require minimum 300,000 emails per month and start at $50/month. Alternative: use Postmark's shared infrastructure included in all tiers. Source: https://www.postmarkapp.com/pricing

Source
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