Softwr

Marketing · head to head

Postscript vs RudderStack

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
RudderStack logo

RudderStack

Automation Integration

The open-source customer data platform

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only RudderStack has a free tier, so it costs nothing to try first.
  • 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.; RudderStack on the free plan data processing stops after a second consecutive overage rather than being billed, so exceeding 250,000 events twice breaks the pipeline
  • They diverge on capability: Postscript covers Shopify segmentation, RudderStack covers Data collection.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Postscript and RudderStack actually diverge.

Attributes where Postscript and RudderStack differ
AttributePostscriptRudderStack
Starting price$49/monthFree
Pricing modelPer month plus per message sentfreemium
Free tierNoYes
PlatformsWeb, iOSWeb, Self-hosted
CategoryMarketingAutomation Integration
FoundedUnknown2018

Identical on both: user rating (Not yet rated).

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 RudderStack

  • Data collection
  • Event tracking
  • Audience segmentation
  • Warehouse ingestion
  • Real-time sync
  • Data transformation
  • Privacy controls
  • 200+ destinations

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 RudderStack
  • A brand running a product drop where a timed broadcast to an opted-in list is the whole launch mechanismnot RudderStack
  • A merchant segmenting by past purchase and variant to send replenishment reminders at the right intervalnot RudderStack
  • A store on headless Shopify or a custom stack that still wants SMS built on order data through the SDKnot RudderStack

RudderStack

  • Collecting event data from apps and websites and routing it to warehouses and toolsnot Postscript
  • Building a warehouse first customer data pipelinenot 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.

RudderStack

  • On the free plan data processing stops after a second consecutive overage rather than being billed, so exceeding 250,000 events twice breaks the pipeline
  • The free plan allows 250,000 events a month
  • Growth starts at $265 a month for 1 million events, with volume sold in tiers up to 25 million
  • Overage is charged as the gap to the next tier's price rather than per event, so a small excess costs a full tier step

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

RudderStack

Free
  • FreeFree
    • 250K events per month
    • 16 SDK sources
    • 200+ cloud destinations
  • Growth$265/month
    • 1 million events per month (up to 25 million available)
    • Unlimited team members
    • Tracking plans
  • Enterprise$null/mo
    • 5-minute warehouse sync
    • Unlimited transformations
    • Access to Profiles & Data Apps

Which should you pick?

Choose Postscript if

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

Choose RudderStack if

  • You need data collection.
  • You want to start without paying.
  • You work on Web, Self-hosted.
  • You also want event tracking.
RudderStack review

Questions people ask

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

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.

RudderStack: What is RudderStack's free plan limit?

RudderStack's free plan includes 250K events per month with 16 SDK sources, 200+ cloud destinations, warehouse destinations, and Reverse ETL at no cost.

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.

RudderStack: How much does RudderStack Growth plan cost?

RudderStack Growth plan costs $265 per month with annual billing discount available, providing 1 million events per month (up to 25 million available), unlimited team members, and 2 workspaces.

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.

RudderStack: What happens if I exceed my RudderStack event limit?

On the free plan, data processing stops after your second consecutive overage. Paid plan customers face overage fees calculated as the difference between the next tier's pricing and their current plan.

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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