Postscript
SMS marketing and sales platform built exclusively for Shopify stores, with AI-driven message optimization and a 34x average ROI.
If SMS is your main revenue driver and you're on Shopify, Postscript is hard to beat. The 34x ROI is backed by first-party data, and AI tools like Infinity Testing and Shopper go beyond what most competitors offer. But it's overkill for small lists or brands needing email in the same platform. Compare with Klaviyo for basic flows and Attentive for enterprise scale.
Verified 22h ago · liveness 87/100 · cite: rightaichoice.com/tools/postscript
- Shopify-based DTC brands scaling SMS as a top revenue channel
- Marketers wanting AI-powered message optimization and testing (Infinity Testing)
- Brands needing compliance support with an in-house legal team
- Stores aiming to grow SMS list 3X faster with popups and CashBack
- Brands needing an all-in-one email, SMS, and push marketing platform
- Stores on non-Shopify ecommerce platforms (WooCommerce, BigCommerce, etc.)
- Small businesses looking for self-serve free or low-cost SMS tool
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Skip Postscript if you're not on Shopify, need email and SMS in one platform, or run a small list where the $49 monthly minimum and per-message fees won't pay off.
After the $100 free trial credit, you'll be charged at the Free package rate ($0.015/SMS) unless you upgrade to a paid plan, which can add up quickly.
Postscript's pricing fits scaling Shopify brands that see SMS as a top revenue channel, with rates dropping as you move up tiers. It's pricier than basic SMS tools like Klaviyo's SMS add-on, but cheaper than Attentive's enterprise-focused pricing for similar AI features.
In short
Postscript — SMS marketing and sales platform built exclusively for Shopify stores, with AI-driven message optimization and a 34x average ROI. Best for Shopify-based DTC brands scaling SMS as a top revenue channel, Marketers wanting AI-powered message optimization and testing (Infinity Testing), Brands needing compliance support with an in-house legal team. Free to start; paid plans from $49/mo.
What's new in Postscript
Checked todayAcross the latest 4 updates: 4 feature updates.
Ask Shopper — query customer conversations for insights
Ask Shopper lets brands query subscriber conversations for themes and patterns, shareable by link. Available for Shopper users.
Shopper Escalates Directly to Your Help Desk
Shopper can now escalate conversations to Gorgias/Zendesk; handles 92% without escalation.
Group A/B Testing for Popup Strategies
Test groups of popups against each other at the strategy level, not just individual variants.
Dynamic Product Photos for RCS Cards
RCS cards now support dynamic product photos pulled from trigger events, synced with fallback messages.
Viability Score
How well maintained and how widely used is Postscript? Built from what the vendor actually publishes (docs, changelog, tutorials, integrations, pricing), whether the site is live, and how much real users discuss it. How we calculate this
Last calculated: August 2026
How we score →Key Features
- SMS marketing campaigns and automations
- Visual Flow Builder with automation templates
- Postscript AI for message generation and optimization
- Infinity Testing: AI-powered testing for campaigns and automations
- Shopper: conversational AI shopping assistant
- Ask Shopper: query customer conversations for insights
- RCS rich messaging with dynamic product photos
- CashBack smart coupon alternative
- Popup Editor with group A/B testing
- Onsite Opt-in forms
- Embedded opt-in forms on product pages and blog posts
- Unlimited segments and advanced segmentation
- Dedicated toll-free number
- Postscript Plus managed SMS service
About Postscript
Postscript is a specialized SMS marketing and sales platform designed exclusively for Shopify stores. Unlike all-in-one platforms that treat SMS as an afterthought, Postscript focuses entirely on text-message revenue, helping DTC brands grow their lists, send high-performing campaigns and automations, and convert more shoppers through conversational AI. It's built for merchants who see SMS as a top revenue channel and want a tool that goes deep on SMS-specific capabilities rather than trying to do everything. The platform combines list-growth tools like Popup Editor, CashBack, and Onsite Opt-in forms with a Visual Flow Builder and automation templates for cart abandonment, welcome, and upsell flows. For scaling brands, Postscript offers AI-powered products: Postscript AI for message generation and optimization, Infinity Testing to replace traditional A/B tests with hundreds of on-brand variants, and Shopper, an always-on 1:1 shopping assistant that handles 92% of conversations without escalation and can pass complex queries to Gorgias or Zendesk. Ask Shopper lets you query customer conversations for themes and insights, shareable by link. RCS rich messaging now includes dynamic product photos in cards, and group A/B testing at the popup strategy level was recently added. Pricing starts free with a $49 monthly minimum spend, then scales through Growth at $100/mo and Professional at $500/mo, with Enterprise custom-priced. Every plan includes unlimited segments, a dedicated toll-free number, response management, and analytics. Postscript also offers Postscript Plus, a managed service where in-house strategists run your SMS program, plus an in-house legal team for compliance support. Where Postscript differs from competitors like Klaviyo or Attentive is its laser focus on SMS and its AI-driven features that drive measurable ROI. Merchants report a 34x average return on SMS spend and 22% of online revenue attributed to Postscript. If SMS is your primary channel and you're on Shopify, Postscript goes deeper than any all-in-one alternative.
Behind the Verdict
Postscript earns its reputation as the SMS specialist for Shopify. The platform's laser focus means SMS-specific features you won't find in all-in-one tools like Klaviyo: group A/B testing for popups, Infinity Testing that replaces manual A/B tests with hundreds of on-brand variants, and Shopper, an AI assistant that handles 92% of conversations without escalation. The new Ask Shopper feature lets you query those conversations for insights, effectively turning your SMS channel into a source of customer intelligence. The pricing model, while not the cheapest per message, is transparent—rates drop as you move up tiers, and the monthly minimums are clear upfront. For brands with serious SMS revenue, the ROI justifies the cost. However, the Shopify-only stance is a real constraint—if you ever move off Shopify, you're locked out. And for smaller lists, the $49 monthly minimum and per-message fees may not pencil out. The upcoming email launch (announced for Sept 23) could change the value proposition, but until it ships, Postscript remains a single-channel play. If you need email, SMS, and push in one place, you're better off with Klaviyo or Attentive—but if SMS is your number one channel, Postscript is the tool to beat.
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Real-world workflow fit
Concrete scenarios for the personas Postscript actually fits — and what changes day-one when you adopt it.
You want to set up cart abandonment automations and start A/B testing message copy.
Outcome: Install Postscript, connect Shopify, and use the Visual Flow Builder to enable the Cart Abandonment template within minutes. Start Infinity Testing to automatically generate and test on-brand message variants, driving higher conversion rates.
You want to implement a VIP concierge service using Shopper AI.
Outcome: Enable Shopper to handle 1:1 customer inquiries 24/7, escalating to Gorgias/Zendesk when needed. Use Ask Shopper to analyze conversation themes and refine your SMS strategy, improving subscriber LTV.
You're just getting started with SMS and need to grow your list.
Outcome: Use the Popup Editor with group A/B testing, CashBack offers, and Onsite Opt-in forms to grow your list 3X faster. Start with the free trial, which includes a $100 credit, to test campaigns without upfront cost.
Use Cases
- Run an SMS abandoned cart flow triggered minutes after abandonment.
- Build a VIP concierge program where high-CLV customers text a human for recommendations.
- A/B test SMS copy and send time on Black Friday campaigns with Shopify revenue attribution.
- Capture SMS opt-ins via Shopify checkout and post-purchase, syncing with Klaviyo.
- Use Shopper AI to answer product questions and drive sales 24/7 without human intervention.
- Launch CashBack campaigns to boost list growth and increase margins over coupons.
- Automate post-purchase upsell and shipping updates using Shopify order data.
- Segment subscribers by LTV, product affinity, or engagement for targeted win-back.
Models Under the Hood
as of 2026-08-10
Limitations
- SMS marketing platform exclusively for Shopify brands.
- Pricing includes per-message rates plus carrier fees and monthly minimums, which may raise effective cost.
- International coverage is not detailed.
- Features like RCS and conversational AI may have specific requirements.
as of 2026-08-14
Verification history
We have re-verified Postscript 17 times since . Each pass re-reads the vendor's own pages and re-checks every listed field against that evidence; passes where nothing had changed are marked as such.
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
- — re-checked, vendor evidence unchanged
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
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12-month cost
Project the real annual outlay, including the implied monthly cost when only an annual tier is published.
Vendor list price only. Add-on usage, seat overages, and contract minimums are surfaced under Hidden costs & gotchas.
Plans compared
For each published Postscript tier: who it actually fits, and what it adds vs. the previous tier. Cross-reference the cost calculator above for projected annual outlay.
Starter
$0/mo + $49 monthly minimum spend
Ideal for
Brands just getting started with SMS who want to test the platform with a low commitment, benefiting from unlimited segments and basic list growth tools.
What this tier adds
Starting tier: $0/mo + $49 min spend, includes 2 opt-in keywords and $0.015/SMS rate.
Growth
$100/mo
Ideal for
Brands building their SMS program with a growing subscriber list, needing unlimited keywords and live chat/email support.
What this tier adds
Adds unlimited opt-in keywords and live chat/email support; drops per-message rates to $0.01/SMS.
Professional
$500/mo
Ideal for
Brands scaling SMS as a top revenue channel, wanting API access and enhanced analytics for deeper optimization.
What this tier adds
Adds Enhanced Analytics, API access, and removes 'Powered by Postscript' from opt-in; rates drop to $0.007/SMS.
Enterprise
Contact us
Ideal for
Brands ready to make SMS their #1 revenue channel, needing dedicated support and custom product recommendations.
What this tier adds
Adds Onboarding Launch Specialist, custom product recommendations, and Data Warehouse Push; custom pricing.
Where the pricing makes sense
The company stage and team size where Postscript's pricing actually pencils out — and where peers do it cheaper.
Postscript's pricing fits scaling Shopify brands that see SMS as a top revenue channel, with rates dropping as you move up tiers. It's pricier than basic SMS tools like Klaviyo's SMS add-on, but cheaper than Attentive's enterprise-focused pricing for similar AI features.
Setup time & first value
How long it actually takes to get something useful out of Postscript — broken out by persona, not the marketing-page minute.
For a new store: 10-15 minutes to install the app, connect Shopify, and set up a basic flow. For a scaling brand: 1-2 hours to configure advanced segments, enable Shopper, and customize RCS. Postscript Plus includes dedicated onboarding for Enterprise.
Switching to or from Postscript
How to bring data in from common predecessors and how to get it back out — written for the switcher, not the buyer.
- →From Klaviyo SMS: Export your subscriber list and opt-in history, then import into Postscript—use the migration support in the Help Center for a smooth transition.
- →From Attentive: Similar data export/import process, but you'll need to rebuild automations in Postscript's Flow Builder.
- ↗To Klaviyo: Export your subscriber list and message history, then re-create automations in Klaviyo's Flow Builder.
- ↗To Attentive: Use the data export feature to move your list and then set up your automations on Attentive.
Integrations
Resources & Guides
Tutorials & Learning
Official links
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