What is Postscript?
Postscript is an SMS marketing tool built specifically for Shopify brands. Most SMS tools are built for generic use cases, which means Shopify merchants end up working around limitations that were never designed with ecommerce in mind. Postscript connects directly to the Shopify ecosystem and gives brands everything they need to grow a subscriber list, send targeted text messages, and turn SMS into a real revenue channel. It’s built for direct-to-consumer brands that want to get serious about SMS marketing without cobbling together workarounds.
The tool covers the full lifecycle of SMS marketing, from capturing new subscribers to running AI-optimized campaigns and two-way conversations. Brand managers, retention marketers, and ecommerce growth teams are the primary users, but it’s also a fit for DTC founders running lean who want an SMS program that runs largely on autopilot.
Postscript Video
Features & Benefits
- Onsite Opt-in Suite: grow your SMS marketing list using customizable popups, a one-time passcode flow, and a network of 130M+ recognized subscribers that removes friction at sign-up; an opt-in reminder re-engages visitors who close the popup before subscribing
- Checkout Subscriber Collection: capture SMS opt-ins directly on checkout pages, including Shopify, Shopify Plus, Recharge, and Carthook
- Landing Pages & Opt-in Forms: build standalone SMS opt-in pages that can be linked from email, social, or any other channel
- Keywords & QR Codes: create trackable text-to-join keywords and QR codes to collect subscribers across marketing channels and in-person touchpoints, with per-source revenue attribution
- Back-in-Stock Capture: collect high-intent subscribers when a product is out of stock by showing a sign-up prompt tied to specific variants
- Subscriber Segmentation: filter your SMS marketing list using 45+ criteria, including Shopify order history, SMS activity, app data, and geographic area codes
- Automation Triggers: fire messages based on 65+ events across the customer journey, including abandoned checkout, order shipped, product viewed, keyword replies, price drops, and low inventory alerts
- Trigger & User Filters: narrow automation logic using 85+ trigger filters (line items, subtotal, discounts applied) and 45+ subscriber filters (location, purchase history, keywords triggered)
- Flow Builder: build and manage campaigns and automations with a drag-and-drop interface; branch flows based on subscriber replies or actions, and track performance with in-flow analytics
- AI Infinity Testing: test thousands of on-brand message variants across your highest-ROI automations, with AI optimizing over time toward the best-converting version
- Brand Center: train the AI on your brand voice, then review and approve AI-generated copy before any message goes out
- AI Shopper Assistant: deploy an always-on AI shopping assistant that talks to subscribers over SMS in your brand voice
- RCS Messaging: send rich, branded messages with images and interactive elements through RCS-enabled messaging
- Responses & Sentiment Filtering: manage inbound subscriber texts with ML-based filtering by sentiment (positive, negative, neutral) and topic (shipping, returns, questions)
- SMS Analytics: visualize campaign and automation performance through dashboards built for Shopify merchants
- Integrations: connect Postscript to help desks, email marketing tools, review platforms, subscription management apps, and analytics platforms via native integrations or API
- Compliance Infrastructure: send within TCPA and carrier guidelines with the backing of an in-house legal team, a TCPA Defense Force partnership, and direct carrier relationships
What can Postscript do?
- Build an SMS marketing subscriber list from Shopify checkout
- Grow SMS opt-ins with AI-recognized returning visitors
- Send abandoned cart text messages to Shopify customers
- Automate post-purchase and order shipping SMS flows
- Test thousands of SMS message variants with AI
- Run back-in-stock SMS alerts for out-of-stock products
- Segment SMS subscribers by purchase history and location
- Send two-way conversational SMS campaigns
- Deploy an AI shopping assistant over SMS
- Send rich branded messages via RCS
- Filter inbound texts by sentiment and topic
- Track SMS campaign revenue in Shopify-native analytics
- Create trackable QR codes for in-person SMS sign-ups
Real-World Applications
A Shopify apparel brand running seasonal drops can use Postscript to build a subscriber list well before a launch and then hit those subscribers with time-sensitive SMS marketing campaigns tied directly to the drop. Flow Builder lets the team set up branching messages that adjust based on whether a subscriber clicked, bought, or ignored the first text, without anyone having to monitor replies manually.
Subscription box brands may find particular value in the automation depth. Postscript can fire recharge-event-based texts when a subscription renews, pauses, or gets cancelled, giving retention teams a direct line to subscribers at exactly the moment it matters. The AI Shopper assistant can also field questions about upcoming boxes or swap requests over SMS around the clock.
A solo founder running a Shopify skincare store can set up a welcome series, abandoned cart flow, and back-in-stock alerts in a single afternoon with the drag-and-drop Flow Builder. Postscript’s SMS marketing automations then run on their own, texting the right subscribers based on real shopping behavior rather than a static schedule.
Agency teams managing multiple DTC brands might use Postscript Plus, where an in-house team of SMS strategists takes over the day-to-day of building, running, and optimizing the SMS program. That’s useful for brands scaling fast that don’t yet have dedicated retention headcount.
Established brands with heavy BFCM traffic can rely on Postscript’s infrastructure to handle message volume spikes without delays or failures, backed by pre-paid throughput bandwidth and a Twilio partnership that triples burst capacity when it’s needed most.
