Email and SMS marketing built for e-commerce, with AI baked in
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Postscript
SMS marketing built specifically for Shopify stores
Freemium
Free trial
Affiliate program
Overview
What Postscript Does
Postscript is an SMS marketing platform built only for Shopify and Shopify Plus stores. Brands use it to grow text-message subscriber lists, send promotional campaigns, and run automations like welcome flows, abandoned-cart reminders, and post-purchase follow-ups. Because it is Shopify-native, it reads order and customer data directly, so messages can reference real products and purchase history.
AI Campaigns and Replies
The AI features live on a dedicated plan. A Brand Center trains the AI on your voice so generated copy sounds like your store rather than a template. Infinity Testing then spins up and tests many on-brand message variants at once to find what converts. On the reply side, Shopper acts as an always-on 1:1 assistant that answers product questions over text and nudges shoppers toward checkout, which turns inbound SMS into a sales channel rather than just a broadcast.
Compliance and Deliverability
SMS carries real legal and carrier rules, and Postscript handles a lot of that in the background. It runs a built-in compliance engine and keeps an in-house legal team focused on text marketing, so opt-ins, opt-outs, and carrier requirements are managed for you. That removes a common source of risk for brands new to texting customers.
Pricing and Fit
Postscript uses platform fees plus per-message costs, so spend scales with volume. The Starter plan has a $0 platform fee with a monthly minimum, Growth runs $100 per month, and Professional is $500 per month, with Enterprise quoted on request. New stores get a 30-day trial backed by $100 in messaging credit. It fits Shopify brands of nearly any size, from early-stage stores testing SMS to large Shopify Plus operations.
Pros
- ✓Built only for Shopify, so data and personalization run deep
- ✓AI message generation and testing speed up campaign creation
- ✓Shopper assistant turns SMS replies into a sales channel
- ✓Compliance handled in the background to lower legal risk
Cons
- ✕Per-message costs mean spend grows with list size and volume
- ✕AI features sit on a separate plan rather than the base tiers
- ✕Only useful if your store runs on Shopify
Key features
Shopify-native SMS
Reads Shopify order and customer data directly to personalize texts and automations.
Campaigns and automations
Sends one-off promotions plus welcome, abandoned-cart, and post-purchase flows.
Brand Center AI
Trains the AI on your store voice so generated copy matches your tone.
Infinity Testing
Generates and tests many on-brand message variants quickly to find winners.
Shopper assistant
An always-on 1:1 reply agent that answers product questions and drives checkout.
Built-in compliance
Handles opt-ins, opt-outs, and carrier rules through a managed compliance engine.
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Frequently asked questions
- Yes. It is built specifically for Shopify and Shopify Plus, which is why it integrates so tightly with store order and customer data.
- Starter has a $0 platform fee with a monthly minimum, Growth is $100 per month, and Professional is $500 per month, all on top of per-message carrier costs that scale with volume.
- It generates on-brand SMS copy from your trained brand voice, tests many message variants at once, and runs a 1:1 Shopper assistant that answers questions and pushes shoppers to checkout.
- Yes. New stores get a 30-day trial that includes $100 in messaging credit so you can launch real campaigns before committing.
Editor’s note
Postscript is one of the cleaner SMS picks for Shopify because it does one platform well rather than spreading across channels. The AI plan is where the newer value sits, but budget for per-message costs since the platform fee is only part of what you pay.