Postscript
Why Postscript
Postscript is a retention marketing platform for Shopify stores that centres on SMS and also sends RCS and email. It combines campaigns, automated flows, subscriber growth tools and segmentation built on store data. It is aimed at e-commerce brands that want text messaging to be a real revenue channel.
What it does
Postscript is a retention marketing platform. Its core is SMS, and it also sends RCS messages from a branded profile and email. You run campaigns, build automated flows in a visual builder, collect subscribers through pop-ups and opt-in links, and reply to customers who text you back.
Segmentation uses your Shopify data and data from connected tools, so you can message people by purchase history, location or engagement.
Why you would need it
Email inboxes are crowded and open rates are hard to move. A text message gets read, and for a store that means a cart reminder or a back-in-stock note that reaches the customer at the right moment.
The catch is that SMS has rules. Consent, quiet hours and opt-out handling can sink a sloppy programme. A platform built around that, with compliance guardrails and a team that knows the rules, saves you from learning them the hard way.
Where it fits
It sits next to your Shopify store and your email tool. The store feeds it customers, orders and discount codes. It feeds back messages, replies and attributed revenue.
You can run it alongside Klaviyo, and there are help articles on using Klaviyo lists to segment subscribers. It replaces a plain SMS add-on or a generic bulk text service that knows nothing about your catalogue.
What stands out
- A visual flow builder with templates for cart and browse abandonment, welcome, upsell and shipping messages.
- Subscriber acquisition tools, including pop-ups, checkout collection and an onsite opt-in, so list growth is part of the product.
- Custom attribution windows, so you can decide how long after a text a sale still counts.
- Billing by message with carrier fees shown on their own line, instead of a flat plan tied to list size.
My take
I would pick Postscript when a Shopify brand is serious about SMS and wants a specialist rather than a feature bolted onto an email tool. The compliance support and opt-in tools are the reasons to choose it over a generic option.
What I would watch is the pricing shape. You pay per message and carrier fees come on top, so costs follow your sending. That is fair, but it needs a forecast. It is also built for Shopify, so a store on another platform should check the fit first.
Verdict
Pick it when you sell on Shopify and want SMS to carry real revenue, with the compliance handled for you. Skip it when you are not on Shopify, or when email is your only channel and you have no plan to add text messages.
Notes
Your note
Before you choose
Cost follows message volume
Plans charge per message and add carrier fees. A busy sale week costs more than a quiet one. Model a normal month and a peak month before you commit, and check which tier gives you the lower rate for your volume.
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What each tier includes
API access for custom integrations is listed on the Professional tier and above. Unlimited opt-in keywords and live chat support start one step lower. If you plan to build on the API, check that the tier you want includes it.
Compliance is on you too
Postscript gives you guardrails and compliance help, but you still send the messages. Know the rules for the countries you sell to, and keep your consent records clean. Rates on the page apply to the United States and Canada, so check other regions.
Shopify focus and alternatives
It is built around Shopify. If you want one tool for email and SMS with a broader channel mix, compare Klaviyo, Omnisend and Privy. If email is the main channel and SMS is a side project, an email-first tool may be enough.