Postscript

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

As of 31 August 2026, Postscript starts at $49/month. Postscript is an SMS and MMS marketing platform wired deeply into Shopify, priced from a $0 base with a $49 minimum monthly spend. Softwr lists it under Marketing. Postscript is available on Web, iOS.

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Overview

What Postscript does

Postscript is a text message marketing platform for ecommerce brands. It covers subscriber acquisition through popups and keywords, one-off campaigns, automated flows such as abandoned cart and browse abandonment, two-way conversational messaging with a sales agent layer, segmentation from Shopify order and customer data, and revenue attribution reporting. It integrates directly with Shopify and supports non-Shopify and headless stores through an SDK. The distinguishing point is depth of the Shopify relationship rather than breadth. Segments can be built from order history, product and variant, discount usage and lifetime value without an ETL step, and messages can carry a link that reconstructs a cart. That is why Shopify-native brands choose it over general CPaaS or an all-channel marketing suite. The pricing structure follows usage: four tiers at $0, $100, $500 a month and custom, with SMS rates falling from $0.015 to $0.007 and MMS from $0.045 to $0.024 as you commit to a higher plan. Who buys it: direct-to-consumer brands on Shopify with enough list size for SMS economics to work. The trade-offs are that carrier pass-through fees sit on top of every message and are frequently left out of the cost model, that the true cost per send is only competitive on the higher monthly commitments, that US regulation around consent and quiet hours carries real legal exposure, and that it is a single-channel tool so email lives elsewhere.

What people use it 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

Where it falls short

Concrete and checkable, so you can decide whether any of them matter to you. This is the half of a review a vendor will not write about 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.

Cross-shopped

What people choose instead of Postscript

Each pairing was judged by two reviewers asking whether a buyer would genuinely weigh the two against each other. The ones that failed were deleted rather than published.

Postscriptvs
Klaviyo
Klaviyo: If you want SMS and email in one platform with shared segments and suppression
Postscriptvs
Omnisend
Omnisend: If you are a smaller store wanting email and SMS bundled at lower cost
Postscriptvs
Twilio
Twilio: If you have developers and would rather build messaging on a raw API than buy a marketing product

Pricing

What Postscript costs

Taken from the vendor's own pricing page. Prices move, so check before you buy.

Starter

$49 /mo

$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
Carrier fees charged separately, averaging $0.00418 SMS and $0.00841 MMS in the US
$100 credit during a 30-day free trial

Growth

$100 /mo

Lower per-message rates than Starter
Full campaign and automation feature set
No contract required

Professional

$500 /mo

Rates falling towards $0.007 SMS and $0.024 MMS
Suited to high-volume senders
Upgrade or downgrade at any time

Enterprise

On request

Custom pricing on a contract
Negotiated message rates and support terms

Capabilities

Features

Shopify segmentation
Segments built from order history, products, discounts and lifetime value without an integration layer
Automated flows
Abandoned cart, browse abandonment, welcome and win-back sequences
Subscriber acquisition
Popups, keywords, QR codes and checkout opt-in to grow the SMS list
Two-way conversations
Human or agent-led replies rather than broadcast-only sending
MMS campaigns
Image and GIF messages at a separate, higher per-message rate
Revenue attribution
Reports attributed revenue per campaign and flow
Headless SDK
Supports non-Shopify and headless storefronts through a developer SDK
Usage-based tiers
Plans upgraded or downgraded at any time with no required contract

Answered, with sources

Questions people ask

Each answer names the page it came from, so you can check it rather than take our word for it.

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.

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.

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.

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.

Keep looking

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Softwr does not host reviews and shows no star rating for Postscript, because a rating we did not collect is not ours to publish. What is here is the pricing and platform detail from the vendor’s own pages, limitations we could state concretely, and alternatives a reviewer confirmed people weigh against it. Tell us if any of it is wrong.

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