Softwr

Marketing · head to head

Postmark vs Postscript

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
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

  • Each has a real cost: Postmark free tier caps at 100 emails per month with no overages allowed; 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.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Postmark and Postscript actually diverge.

Attributes where Postmark and Postscript differ
AttributePostmarkPostscript
Starting priceOn request$49/month
Pricing modelUnknownPer month plus per message sent
PlatformsWebWeb, iOS

Identical on both: free tier (No), 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 Postmark

Nothing recorded that Postscript does not also cover.

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.

Postmark

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

Postscript

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

Where each one falls short

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

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

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

Postmark

On request

No published plan breakdown. See the Postmark review.

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 Postmark if

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

Postmark review

Choose Postscript if

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

Questions people ask

Is Postmark or Postscript better?
Neither clearly leads. Postmark starts at On request and Postscript at $49/month, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Postmark or Postscript?
Postmark starts at On request and Postscript at $49/month.
Does Postmark or Postscript run on more platforms?
Postmark runs on Web. Postscript runs on Web, iOS.
What is Postmark best used for?
Postmark is most often used for sending password reset emails with industry-leading delivery speed, processing inbound email replies into json objects for applications, tracking failed email deliveries and suppressing invalid addresses, separating transactional emails from marketing emails with message streams. Of those, sending password reset emails with industry-leading delivery speed and processing inbound email replies into json objects for applications are not what Postscript is typically brought in for.
What can Postmark do that Postscript cannot?
Postscript covers Shopify segmentation, Automated flows, Subscriber acquisition, Two-way conversations.

Answered from the vendors’ own pages

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
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.

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
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.

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
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.

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
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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