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What is Postscript?
Postscript is an AI tool (by Postscript) that helps ecommerce stores, especially those selling on Shopify, retain customers with SMS, RCS and email messages. With version 2.0 the company rebuilt the platform from scratch to work with AI agents.
How does Postscript use AI?
Its foundation is the Agentic Context Platform (ACP), which holds customer and brand context so agents can read that data and act on each individual. Several products run on top of it:
- Shopper: 1:1 marketing with agents that decide which message each customer gets based on what is known about them.
- Infinity Testing: tests hundreds of message variants across campaigns and automations.
- Brand Center: manages tone, knowledge base, offers and catalog so the AI speaks like your brand.
What else does it include?
It offers a visual flow builder with templates for cart and browse abandonment, welcome, upsell and shipping; list growth tools such as popups, checkout collection and Onsite Opt-in; advanced segmentation with Shopify data; revenue and performance analytics; reply management; integrations and an API. The Postscript Plus service adds strategists who run your SMS program for you.
Postscript pros and cons
It stands out for its SMS focus on Shopify, built-in compliance tools and fast product releases. On the downside, its messaging service is built mainly for the US and Canada, the interface is in English and the most advanced AI features are add-ons.
Postscript features and use cases
How to use Postscript
Postscript FAQ
What is Postscript?
Postscript is an AI retention marketing platform that sends SMS, RCS and email campaigns and automations for online stores.
Is Postscript free?
It is not free, but it offers a trial with a 100 USD credit for 30 days. After that you pay per plan and per message sent.
Does it work with Shopify?
Yes, it is deeply integrated with Shopify and uses its data to segment and automate messages.
Does it have an API?
Yes, it offers an API for custom integrations, included from the Professional plan.
Does it work in Spanish?
You can write your messages in Spanish, but the platform and site are in English and published rates are for the US and Canada.
What is Shopper?
It is its 1:1 marketing product with AI agents that pick the right message for each customer based on their behavior.
What is Infinity Testing?
It is a feature that tests hundreds of message variants across campaigns and automations to find the best performers.
Does it offer a managed service?
Yes, Postscript Plus gives you strategists who build, run and optimize your SMS program.
What are the alternatives to Postscript?
In the directory you can compare it with Klaviyo, Omnisend or Attentive, which also combine SMS and email with AI.
Postscript pricing and plans
Reference price: 49 USD / month. Source · Verified: November 5, 2026
Information from the official site (Checked on: 05/11/2026). Rates for the US and Canada, plus carrier fees.
- Starter: 0 USD/month with a 49 USD/month minimum spend; 0.009 USD per SMS and 0.045 USD per MMS.
- Growth: 100 USD/month; 0.008 USD per SMS and 0.03 USD per MMS.
- Professional: 500 USD/month; 0.007 USD per SMS and 0.024 USD per MMS, with API access.
- Enterprise: custom pricing.
- Postscript AI Plan: 699 USD/month plus per-message rates from 0.003 to 0.30 USD.
The free trial includes a 100 USD credit for the first 30 days.
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