Postscript

Postscript is a SaaS platform that lets Shopify merchants run SMS marketing in the U.S. and Canada. Pricing is tiered by monthly message volume: free to install for ≤50 messages, then mid-range plans from $0.0075–$0.01 per SMS plus platform fees that scale to enterprise. The product is sold only online, directly through the Shopify App Store and its own site. The company’s core edge is carrier-grade deliverability, built-in TCPA compliance tools, and two-click Shopify segment sync that turns store events (checkout, fulfillment, replenishment) into automated text flows. It is best-known for its “Conversational SMS” inbox that lets support agents answer customers in real time and for revenue attribution dashboards that tie every text to a Shopify order. Target users are fast-growing DTC brands on Shopify doing $1–$250 M in annual revenue and seeking owned, high-ROI retention channels. They value data-driven growth, want to reduce email clutter, and typically serve millennial/Gen-Z shoppers who prefer mobile-first communication. Postscript competes in the crowded Shopify marketing-app space against email-centric and omnichannel retention platforms. It differentiates by focusing exclusively on SMS, offering native Shopify depth that generic messaging tools lack, and providing in-house compliance counsel plus direct carrier relationships that smaller SMS plugins do not maintain.