Postscript

Postscript is a software platform for SMS marketing — the practice of reaching customers through text messages — built primarily for brands running on Shopify, the e-commerce platform. It gives merchants the tools to grow a list of subscribers who opt in to receive texts, send promotional campaigns such as sale announcements and product launches, and run automated flows triggered by customer behavior, like a text reminding someone about an abandoned cart or welcoming a new subscriber. Because it is designed around Shopify, Postscript integrates tightly with a store's product catalog, customer records, and order data, so texts can be personalized and tied to what a customer actually browsed or bought. It also handles the practical machinery of compliant SMS — collecting proper opt-in consent, managing opt-outs, and working within carrier and regulatory rules — which is essential, because text messaging is a heavily regulated, permission-based channel.

SMS is a distinctive marketing channel: text messages are short, land directly on a phone, and are usually read quickly, which makes the channel high-attention and immediate but also intrusive if misused. That combination is why platforms like Postscript emphasize consent, frequency control, and relevance — a well-run SMS program feels like timely, wanted updates, while a poorly run one feels like spam and drives opt-outs. For a Shopify merchant, Postscript is typically used alongside email rather than instead of it: email carries longer, richer content, while SMS carries short, urgent, high-open messages. The two are often coordinated so that each channel does what it does best. Placing Postscript correctly means seeing it as a Shopify-focused SMS specialist that adds a text-messaging layer to a store's marketing, complementing email and integrating with the commerce data that makes the messages relevant.

Postscript's most direct comparison is Attentive, another leading SMS marketing platform, and the two are often weighed against each other. Both do the core job: growing opted-in text-message subscriber lists, sending campaigns and automated flows, personalizing with commerce data, and handling the consent and compliance that SMS demands. So at the category level they are direct competitors in e-commerce text-message marketing. The differences are matters of positioning and fit. Postscript has built its reputation around a deep focus on Shopify and a strong fit for small and mid-sized Shopify merchants, with tight integration into that ecosystem. Attentive is often positioned for a broader and more enterprise range of clients and platforms, with its own emphasis on list-growth technology and scale. Neither is universally superior; the right choice depends on a brand's platform, size, budget, and the specific features and support it needs.

The practical decision, then, is not which platform is better in the abstract but which fits the business. A smaller or mid-market brand built entirely on Shopify may find Postscript's focus and integration a natural match, while a larger, multi-platform, or enterprise brand may weigh Attentive's scale and breadth. Pricing models, deliverability, list-growth tools, automation depth, and quality of support all factor in, and both platforms evolve, so evaluations should rest on current capabilities rather than reputation alone. The key point for a marketer is to treat Postscript and Attentive as peer SMS platforms in the same category — chosen on fit — rather than assuming a single default. And whichever is chosen, the harder work is the SMS strategy itself: consent, relevance, and frequency matter far more to results than the choice between two capable vendors.

Using Postscript — or any SMS platform — well starts with consent and respect for the channel. Grow the subscriber list through genuine opt-ins, make the value of subscribing clear, and honor opt-outs immediately, because SMS is permission-based and heavily regulated, and abuse carries both legal and reputational cost. Once the list is built, protect it with restraint: text is intrusive, so send fewer, more relevant, more timely messages rather than blasting frequently. Use the Shopify integration to personalize — trigger flows from real behavior like abandoned carts, tie offers to what a customer bought, and segment so messages fit the recipient. Coordinate with email so each channel plays its strength: email for depth, SMS for short, urgent, high-attention moments. And measure results against the opt-out and complaint rates too, since a campaign that drives sales but burns the list is a bad trade.

The failures in SMS are unforgiving because the channel is so personal. Over-messaging is the classic mistake — texting too often drives opt-outs and complaints, shrinking the very list that makes the channel valuable. Weak or improper consent creates compliance risk and erodes trust. Sending irrelevant, untargeted blasts wastes the channel's high attention and trains people to ignore or leave. Treating SMS as a standalone silo, uncoordinated with email, misses the point that the two work best together. And chasing short-term sales at the expense of list health quietly destroys long-term value. The discipline is to build the list on clean consent, message sparingly and relevantly using commerce data, coordinate with email, respect opt-outs and regulation, and watch list-health metrics as closely as sales. Used that way, Postscript makes SMS a high-return channel; misused, it turns a permission asset into spam.

Postscript takes its name from the note added after a letter's signature, evoking a short follow-up message, applied to a Shopify SMS-marketing platform.

Etymology: source.

Search interest for this term over the last five years:

View interest-over-time on Google Trends →

Areas of marketing where postscript is a core concern: