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Marketing · head to head

Convert vs Postscript

Convert logo

Convert

Marketing

A/B testing platform for enterprises

From
Free
Rated
-
Full reviewWebsite
Postscript logo

Postscript

Marketing

SMS marketing built for Shopify merchants, with carrier fees billed on top of message rates

From
$49/month
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; Postscript carrier pass-through fees are billed on top of the per-message rate, roughly $0.00418 per SMS and $0.00841 per MMS in the United States, and are routinely missing from the cost comparisons buyers build.
  • They diverge on capability: Convert covers A/B testing, Postscript covers Shopify segmentation.
  • Prices and features above were last checked on 2 September 2026.

Where they differ

Only the attributes on which Convert and Postscript actually diverge.

Attributes where Convert and Postscript differ
AttributeConvertPostscript
Starting priceFree$49/month
Pricing modelsubscriptionPer month plus per message sent
Free tierYesNo
PlatformsWebWeb, iOS
Founded2012Unknown

Identical on both: 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 Postscript

  • Shopify segmentation
  • Automated flows
  • Subscriber acquisition
  • Two-way conversations
  • MMS campaigns
  • Revenue attribution
  • Headless SDK
  • Usage-based tiers

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 Postscript
  • Full-stack experimentation on web and mobilenot Postscript
  • Sequential testing and statistical confidence trackingnot Postscript

Postscript

  • A Shopify direct-to-consumer brand that wants abandoned cart recovery by text rather than another email in an ignored inboxnot Convert
  • A brand running a product drop where a timed broadcast to an opted-in list is the whole launch mechanismnot Convert
  • A merchant segmenting by past purchase and variant to send replenishment reminders at the right intervalnot Convert
  • A store on headless Shopify or a custom stack that still wants SMS built on order data through the SDKnot 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

Postscript

  • Carrier pass-through fees are billed on top of the per-message rate, roughly $0.00418 per SMS and $0.00841 per MMS in the United States, and are routinely missing from the cost comparisons buyers build.
  • The cheapest per-message rates require the $500 a month plan, so a small sender pays more than double the headline low rate per text.
  • The $0 Starter plan carries a $49 minimum monthly spend, so it is not a free tier and quiet months still generate a bill.
  • US SMS marketing carries real legal exposure under consent, quiet hours and carrier registration rules, and the compliance obligation sits with the merchant, not the platform.
  • It is SMS and MMS only, so email, push and on-site messaging live in a separate tool and audience suppression between the two has to be managed across systems.

Pricing, plan by plan

Convert

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

Postscript

$49/month
  • Starter$49/month
    • $0 base fee but a $49 minimum monthly spend
    • SMS at $0.015 and MMS at $0.045 per message
    • Campaigns, automations, acquisition tools and analytics
  • Growth$100/month
    • Lower per-message rates than Starter
    • Full campaign and automation feature set
    • No contract required
  • Professional$500/month
    • Rates falling towards $0.007 SMS and $0.024 MMS
    • Suited to high-volume senders
    • Upgrade or downgrade at any time
  • Enterprise$undefined/month
    • Custom pricing on a contract
    • Negotiated message rates and support terms

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 Postscript if

  • You need shopify segmentation.
  • You work on Web, iOS.
  • You also want automated flows.
Postscript review

Questions people ask

Is Convert or Postscript better?
Neither clearly leads. Convert starts at Free and Postscript at $49/month, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Convert or Postscript?
Convert has a free tier; the other does not. Paid plans start at Free for Convert and $49/month for Postscript.
Does Convert or Postscript run on more platforms?
Convert runs on Web. Postscript runs on Web, iOS.
Can I use Convert for free?
Yes. Convert has a free tier, so you can try it without paying. Postscript starts at $49/month.
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 Postscript is typically brought in for.
What can Convert do that Postscript cannot?
Convert covers A/B testing, Multivariate testing, Analytics, API access. Postscript covers Shopify segmentation, Automated flows, Subscriber acquisition, Two-way conversations.

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
Postscript: Is Postscript only for Shopify?

It is built for Shopify and that is where its segmentation advantage lies, but headless and non-Shopify stores are supported through an SDK with more setup work.

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
Postscript: What is the real cost per text?

The plan rate plus carrier fees. On Starter that is about $0.015 plus roughly $0.00418 in US carrier fees per SMS, so budget close to two cents a message before discounts.

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
Postscript: Is the Starter plan free?

No. The base fee is $0 but there is a $49 minimum monthly spend, so it functions as a $49 floor.

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
Postscript: Do I need a contract?

No. Contracts are offered but not required, and plans can be moved up or down at any time under usage-based billing.

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