What Is Postscript?
Postscript is a Shopify-exclusive SMS marketing platform founded in 2018. Unlike general marketing tools that bolt on SMS as an afterthought, Postscript was built from the ground up specifically for Shopify merchants who want to grow revenue through text marketing.
The platform covers the full SMS marketing lifecycle: growing your subscriber list, setting up automated flows (abandoned cart, welcome series, post-purchase), sending broadcast campaigns, and analyzing revenue attribution down to the individual message. As of 2026, Postscript is used by thousands of Shopify brands ranging from early-stage DTC stores to brands doing $50M+ in annual revenue.
Where Postscript differentiates itself is in two areas: community and Shopify depth. The Postscript merchant community is genuinely one of the most engaged in the ecommerce space — active Slack groups, flow libraries, and peer benchmarks. And the Shopify integration isn't just surface-level; Postscript pulls live inventory, order status, product data, and customer LTV into its segmentation engine.
Postscript Pricing (2026)
Postscript's pricing model combines a monthly platform fee with per-message usage costs. Here's the full breakdown:
| Plan | Monthly Fee | Best For | Key Features |
|---|---|---|---|
| Starter | $100/mo | Early-stage Shopify stores | Core flows, campaigns, basic analytics, subscriber growth tools |
| Professional | ~$500/mo | Growing brands, $1M–$10M revenue | A/B testing, dedicated sending numbers, advanced segmentation, priority support |
| Enterprise | Custom | High-volume brands, $10M+ revenue | Custom sending infrastructure, dedicated CSM, SLA guarantees, custom reporting |
Postscript offers a 30-day free trial on the Starter plan — one of the more generous trials in the SMS space. You can build flows, set up subscriber collection, and test campaigns before committing.
Core Features
📱 SMS & MMS Campaigns
Postscript supports both standard SMS (text-only) and MMS (with images, GIFs). The campaign builder is clean and intuitive — you pick a segment, compose your message, preview on a mock phone, and schedule or send. Message personalization is solid, pulling in first name, last product viewed, cart value, and other Shopify data points dynamically.
Campaign reporting shows delivered, clicks, conversions, and revenue attributed — all tied back to Shopify orders. The attribution window is configurable (7-day default), and you can see exactly which messages drove purchases.
🔄 Automation Flows
Postscript's flow builder is where it really shines for Shopify merchants. Pre-built flows include:
- Abandoned cart — triggered when a customer adds to cart but doesn't purchase (typically 2–3 messages over 24–72 hours)
- Welcome series — onboard new subscribers with a brand story, offer, and product education
- Post-purchase — order confirmation, shipping updates, review requests
- Winback — re-engage lapsed customers based on days since last purchase
- Browse abandonment — triggered when a customer views a product but doesn't add to cart
- Back-in-stock alerts — automatically notify interested customers when inventory restocks
The flow editor uses a conditional branching logic — you can split flows based on customer LTV, purchase history, or segment membership. It's not as visually polished as Klaviyo's email flow builder, but it covers the core ecommerce use cases well.
📈 Subscriber Growth Tools
Postscript has invested heavily in subscriber acquisition. Tools include:
- Pop-up forms — customizable SMS opt-in forms for your Shopify storefront
- Keyword campaigns — "Text JOIN to 12345" promotions for social or packaging
- Checkout opt-in — Shopify checkout integration to collect SMS consent at purchase
- QR codes — for print, packaging, and in-store subscriber collection
- Dual opt-in flows — collect email + phone together for cross-channel campaigns
The subscriber collection tools are TCPA and CTIA compliant, with double opt-in support and clear consent language built in.
🔍 Segmentation & Personalization
Postscript pulls live Shopify data — orders, products, customer tags, LTV, purchase frequency — into its segmentation engine. You can create segments like "purchased more than 2x in last 90 days and hasn't bought in 30 days" or "has viewed [specific product collection] but never purchased." The depth of Shopify data access is genuinely impressive compared to generic SMS tools.
📊 Analytics & Revenue Attribution
Revenue attribution is first-class. Postscript shows total SMS revenue, revenue per subscriber, revenue per message, and conversion rates at the campaign and flow level. The dashboard provides a clear view of SMS channel ROI without requiring custom reporting setup. For brands evaluating SMS ROI, this makes the business case easy to present.
Postscript Pros & Cons
✓ Pros
- Deepest Shopify integration of any SMS platform
- Strong merchant community (Slack, flow libraries, benchmarks)
- Excellent subscriber growth tooling
- Clear, honest revenue attribution tied to Shopify orders
- Pre-built DTC flows that actually work out of the box
- 30-day free trial — generous for an SMS platform
- Good compliance tooling (TCPA, CTIA, GDPR)
- Transparent pricing — no hidden fees, clear usage model
✗ Cons
- SMS only — no native email channel
- Shopify only — no WooCommerce, BigCommerce, or headless support
- Gets expensive at scale with per-message fees on top of monthly
- Flow builder less visually polished than Klaviyo's
- No mobile push, in-app, or web push channels
- Professional plan jump ($100 → ~$500) is steep
- Limited native email coordination (must use separate email tool)
Postscript Score Breakdown
Who Is Postscript Best For?
- Shopify brands doing $500K–$20M in annual revenue where SMS is a meaningful revenue channel
- DTC brands with an existing email tool (Klaviyo, Omnisend) who want a dedicated SMS platform alongside it
- Brands that value community and peer learning — the Postscript merchant community is one of the best in DTC
- Stores with meaningful SMS list potential — at least 5,000 subscribers to justify the monthly fee
- Brands focused on SMS flows — abandoned cart, winback, post-purchase sequences
Postscript is NOT right for: non-Shopify stores, brands that need email + SMS in one platform, early-stage stores with minimal subscriber lists (the $100/mo base fee won't pay for itself with 500 subscribers), or brands that want enterprise-level SMS with custom sending infrastructure (look at Attentive instead).
Postscript vs Competitors
| Platform | Best For | Starting Price | Shopify? | Email Included? | SMS Focus |
|---|---|---|---|---|---|
| Postscript | Shopify SMS specialists | $100/mo + usage | Shopify only | No | ⭐⭐⭐⭐⭐ |
| Klaviyo | Email + SMS all-in-one | $20/mo | Yes + others | Yes (core) | ⭐⭐⭐⭐ |
| Attentive | Enterprise SMS (high volume) | ~$400/mo (custom) | Yes + others | Add-on | ⭐⭐⭐⭐⭐ |
| Omnisend | Budget email + SMS | $16/mo | Yes + others | Yes (core) | ⭐⭐⭐ |
Postscript vs Klaviyo
This is the most common comparison. Klaviyo wins if: you want email and SMS managed together with unified customer profiles, you're budget-conscious, or you're not ready to pay separately for two platforms. Postscript wins if: SMS is your primary revenue channel, you want deeper SMS-specific analytics, or you want the best Shopify SMS community for peer learning and flow templates. Many mature DTC brands actually run both: Klaviyo for email + Postscript for SMS. The downside is managing two platforms and syncing subscriber data between them.
Postscript vs Attentive
Attentive is the enterprise competitor. Attentive wins for brands doing high SMS volume ($2,000+/mo), needing enterprise compliance infrastructure, or wanting AI-powered conversational SMS. Postscript wins for self-serve access, transparent pricing, and the community angle. Most brands under $20M revenue are better served by Postscript (or Klaviyo) before graduating to Attentive.
Frequently Asked Questions
Postscript starts at $100/month for the Starter plan, plus per-message usage fees (~$0.01–$0.015/SMS). Professional is around $500/month. Enterprise is custom. There's a 30-day free trial on Starter. At scale, a brand sending 200,000 SMS/month would pay roughly $500–$800 monthly in platform + usage fees combined.
For pure SMS functionality on Shopify, yes — Postscript offers deeper Shopify integration and a better SMS community. But Klaviyo wins for brands that want email + SMS in one platform. If you're starting from scratch and only have budget for one tool, start with Klaviyo. If you already use Klaviyo for email and want to upgrade your SMS specifically, Postscript is a strong upgrade.
No. Postscript is Shopify-exclusive. If you're on WooCommerce, BigCommerce, or any other platform, Postscript is not available to you. Instead, look at Klaviyo (supports most platforms), Omnisend (also multi-platform), or Attentive (enterprise, multi-platform).
Yes — 30 days free on the Starter plan. You'll need to enter billing information but won't be charged during the trial. This is one of the more generous trials in SMS marketing; enough time to build flows, collect subscribers, and run your first campaign.
The main alternatives are Klaviyo (best all-in-one, email + SMS), Attentive (enterprise SMS), and Omnisend (budget-friendly email + SMS). For Shopify brands that need email + SMS in one tool and want to stay with one platform, Klaviyo is the most popular alternative. See our Klaviyo review and best SMS platforms roundup for more detail.
Yes, for the right brand. If you're a Shopify store doing over $1M revenue, already using a separate email tool, and want to invest specifically in growing SMS as a revenue channel — Postscript is worth the $100+/month. The community, flow templates, and Shopify data depth are genuinely better than what you get with Klaviyo's SMS module. Start the 30-day trial and see if it pays for itself in the first month of running your abandoned cart flow.
Bottom Line
Postscript scores 8.6/10 and earns our "Best Shopify-Native SMS Platform" badge. It's the right tool for Shopify merchants who are serious about SMS as a dedicated revenue channel and want purpose-built tooling, genuine community, and best-in-class Shopify data integration.
The limitations are real: SMS only, Shopify only, and the per-message pricing adds up at scale. But for the right brand — a Shopify store between $1M–$20M revenue where SMS is a meaningful channel — Postscript is the best purpose-built tool available.
If you want email + SMS in one platform, or if you're not on Shopify, Klaviyo is your answer. If you need enterprise SMS, look at Attentive.
🔗 Related reading: Klaviyo Review · Attentive Review · Best SMS Marketing Platforms for Ecommerce