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Marketing · head to head

Postscript vs Wunderkind

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
Wunderkind logo

Wunderkind

Marketing

Identity resolution and triggered messaging for high-traffic retailers, formerly BounceX

From
On request
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: 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.; Wunderkind pricing is never published and deals are annual with revenue-share terms and a floor, so the effective cost only becomes clear after a year of attributed revenue you have already paid against.
  • They diverge on capability: Postscript covers Shopify segmentation, Wunderkind covers Identity resolution network.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Postscript and Wunderkind actually diverge.

Attributes where Postscript and Wunderkind differ
AttributePostscriptWunderkind
Starting price$49/monthOn request
Pricing modelPer month plus per message sentquote
PlatformsWeb, iOSWeb, API

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 Postscript

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

Only in Wunderkind

  • Identity resolution network
  • Triggered email
  • Text message marketing
  • Onsite behavioural messaging
  • Performance-linked pricing
  • Managed service model
  • Attribution reporting
  • Email service provider integration

What people use each for

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

Postscript

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

Wunderkind

  • A large apparel retailer that captures email addresses from only a small share of its traffic and wants to message the rest of its cart abandonersnot Postscript
  • A publisher converting anonymous readers into newsletter subscribers and paid subscription prospects at volumenot Postscript
  • A travel brand with long consideration cycles that wants triggered messaging on browse behaviour without waiting for a form fillnot Postscript
  • A retailer that already has a capable ESP and wants an additional revenue channel layered on top rather than a platform replacementnot Postscript

Where each one falls short

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

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.

Wunderkind

  • Pricing is never published and deals are annual with revenue-share terms and a floor, so the effective cost only becomes clear after a year of attributed revenue you have already paid against.
  • You pay against Wunderkinds own attribution of the revenue it claims to have driven, so the lookback window, credit rules and whether a genuine holdout test is run are commercial terms that materially change your bill and are easy to leave vague.
  • The model needs scale: a site without substantial traffic generates too few identity matches to clear a contract floor, which makes it uneconomic for mid-market retailers however good the pitch sounds.
  • Messaging people who never gave you their email address on your own site carries privacy exposure and brand risk, and it sits uncomfortably with several regulatory regimes and with some consumers regardless of legal defensibility.
  • The identity network is densest in the United States, so a European or Asian retailer gets materially lower match rates and a weaker business case, and the model interacts badly with strict consent regimes such as GDPR.

Pricing, plan by plan

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

Wunderkind

On request
  • Wunderkind for Email$undefined/year
    • Identity resolution and triggered email programmes
    • Managed strategy and campaign operation
    • Annual contract with performance-linked commercial terms
  • Wunderkind for Text$undefined/year
    • SMS programmes against the identity graph
    • Consent and suppression management
    • Annual contract with performance-linked commercial terms

Which should you pick?

Choose Postscript if

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

Choose Wunderkind if

  • You need identity resolution network.
  • You work on Web, API.
  • You also want triggered email.
Wunderkind review

Questions people ask

Is Postscript or Wunderkind better?
Neither clearly leads. Postscript starts at $49/month and Wunderkind at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Postscript or Wunderkind?
Postscript starts at $49/month and Wunderkind at On request.
Does Postscript or Wunderkind run on more platforms?
Postscript runs on Web, iOS. Wunderkind runs on Web, API.
What is Postscript best used for?
Postscript is most often used for a shopify direct-to-consumer brand that wants abandoned cart recovery by text rather than another email in an ignored inbox, a brand running a product drop where a timed broadcast to an opted-in list is the whole launch mechanism, a merchant segmenting by past purchase and variant to send replenishment reminders at the right interval, a store on headless shopify or a custom stack that still wants sms built on order data through the sdk. Of those, a shopify direct-to-consumer brand that wants abandoned cart recovery by text rather than another email in an ignored inbox and a brand running a product drop where a timed broadcast to an opted-in list is the whole launch mechanism are not what Wunderkind is typically brought in for.
What can Postscript do that Wunderkind cannot?
Postscript covers Shopify segmentation, Automated flows, Subscriber acquisition, Two-way conversations. Wunderkind covers Identity resolution network, Triggered email, Text message marketing, Onsite behavioural messaging.

Answered from the vendors’ own pages

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.

Wunderkind: Is Wunderkind the same as BounceX?

Yes. BounceX rebranded as Wunderkind in 2019; the identity resolution and triggered messaging model is the same lineage.

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.

Wunderkind: How is Wunderkind priced?

It is not published. Contracts are annual and structured around a share of revenue Wunderkind attributes to its messages, usually with a minimum commitment.

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.

Wunderkind: Does it replace my email platform?

No. It runs alongside your existing ESP and adds a triggered channel; it is not a campaign management replacement.

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.

Wunderkind: Will it work outside the United States?

Less well. The identity network is concentrated in the US, and consent requirements in Europe reduce both match rates and the legal room to message unidentified visitors.

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