Postscript

Sweet spot: a Shopify DTC brand at $1M–$50M/year where SMS is already a meaningful revenue line and the team is willing to operate conversational features (Postscript Sales, two-way replies). The Shopify-native data plus the conversational layer is what justifies the premium over Klaviyo SMS. Failure modes. Brands sign up for Postscript, treat it like a one-way blast tool, and never touch the conversational features. At that point you are paying a premium for capabilities you are not using — Klaviyo SMS would be cheaper and good enough. The other failure is opt-in cost: aggressive popup-based list growth on a small base produces a list that does not respond well, and SMS unsubscribes burn list value faster than email. Carrier filtering on toll-free numbers can also cause silent delivery issues that go unnoticed for weeks. What to pilot. Run Postscript on Growth tier ($100/mo) for 60 days against your top three SMS use cases (abandoned cart, post-purchase, one Black Friday-style campaign). Track revenue per SMS and SMS-attributed revenue against your prior tool or against Klaviyo SMS. If Postscript drives ≥20% more revenue per send and your team uses the conversational features at least once per week, the investment is real; if not, consolidate into Klaviyo and save the bill.

Postscript is an SMS marketing platform purpose-built for Shopify. It handles the full lifecycle: opt-in capture (popups, checkout, keywords, dedicated landing pages), list management with consent and quiet hours, campaign sends, automated flows (abandoned cart, browse abandonment, post-purchase, win-back), conversational two-way messaging, and analytics tied to Shopify revenue attribution. The product differentiates from generic SMS tools (Twilio, Attentive) on two axes. First, Shopify-native data: every event, segment, and flow can reference Shopify orders, products, and customer attributes without ETL. Second, the conversational layer — Postscript Sales is a human-in-the-loop product where AI suggests responses to inbound texts and a sales team closes the order via SMS. For DTC brands where SMS is a real revenue channel, that combination is the moat. Pricing has two components: a base monthly subscription ($0 starter with $49 minimum spend, $100 Growth, $500 Professional, custom Enterprise) and per-message rates ($0.007–$0.015/SMS, $0.024–$0.045/MMS) that drop with tier. Carrier fees apply on top, which surprises some operators. Postscript and Klaviyo SMS are the two serious choices for Shopify brands; Postscript wins on SMS-native depth, Klaviyo wins on email + SMS unification.