Postscript
Shopify-native SMS, RCS, and now email retention platform with AI agents, Infinity Testing, and per-message pricing.
If SMS or RCS is a top-three revenue channel for your Shopify store, Postscript's AI stack — agentic Shopper Automations (shipped Aug 13, 2026), Infinity Testing, and Brand Center on the Agentic Context Platform — plus in-house compliance is a genuinely narrow, deep product, and the email channel that once held it back has now launched. The catch is cost structure: Starter is $0/mo but carries a $49 monthly minimum spend, and per-message rates ($0.009/SMS, $0.045/MMS on Starter) plus carrier fees stack on top. The AI Plan itself is $699/mo with per-message rates from $0.003 to $0.30. Compare against Klaviyo if you need one platform across channels with a shared data layer, or Attentive if
Verified 7h ago · liveness 87/100 · cite: rightaichoice.com/tools/postscript
- Shopify DTC brands where SMS or RCS is a top revenue channel
- Retention marketers who want AI-generated on-brand variants via Infinity Testing
- Teams that need an always-on agentic assistant handling 1:1 product questions and journeys
- Brands that want SMS compliance covered by an in-house legal team
- Stores on WooCommerce, BigCommerce, or other non-Shopify platforms
- Small senders who won't clear the $49 monthly minimum spend plus per-message and carrier fees
- Brands whose subscriber list is too small for AI-driven variant testing to produce a signal
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Skip Postscript if your store isn't on Shopify, or if your monthly SMS volume won't cover the $49 minimum spend plus per-message and carrier fees on top of any subscription you'd need to justify the AI features.
Carrier fees pass through at cost on a separate line — $0.00330 per SMS, $0.00799 per MMS, $0.0047 per text RCS, and $0.0087 per media RCS for US 50 states and Canada — so your per-message rate is not the whole bill.
Fits Shopify DTC brands doing enough SMS or RCS volume to clear the $49 monthly minimum and benefit from paid tiers — Starter ($0/mo + $49 minimum), Growth ($100/mo), Professional ($500/mo), and Enterprise (custom). The Postscript AI Plan at $699/mo is priced for brands where AI-driven 1:1 journeys and Infinity Testing will measurably move revenue. Compared with Klaviyo or Attentive, Postscript undercuts on per-message SMS rates and claims 20–30% lower email pricing than legacy providers;
In short
Postscript — Shopify-native SMS, RCS, and now email retention platform with AI agents, Infinity Testing, and per-message pricing. Best for Shopify DTC brands where SMS or RCS is a top revenue channel, Retention marketers who want AI-generated on-brand variants via Infinity Testing, Teams that need an always-on agentic assistant handling 1:1 product questions and journeys. Free to start; paid plans from $100/mo.
What's new in Postscript
Checked todayAcross the latest 1 update: 1 launch.
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: September 2026
How we score →Key Features
- SMS marketing campaigns and automations
- RCS rich messaging with branded profile
- Email channel built on the same AI-native foundation
- Visual Flow Builder with cart and browse abandonment, welcome, upsell, and shipping templates
- Agentic Context Platform (ACP) holding brand and customer context, included on every plan
- Brand Center for training brand voice, knowledge base, offers, and product catalogue
- Infinity Testing: hundreds of on-brand variants for campaigns and automations
- Shopper AI-powered 1:1 marketing journeys
- Shopper Automations: agentic 1:1 journeys curated from behavior and past conversations
- Transparent test-vs-control revenue reporting for AI features
- Onsite Opt-in with patented list-growth technology
- Popup Editor with group A/B testing
- CashBack smart coupon alternative with built-in A/B testing
- Checkout collection and opt-in forms for subscriber acquisition
- Unlimited segments and advanced segmentation on Shopify data
About Postscript
Postscript is a retention marketing platform that began as a Shopify-only SMS tool and has since expanded into RCS and email. The company rebuilt the platform ("Postscript 2.0") around an Agentic Context Platform (ACP) — a data layer holding brand context (voice, offers, catalogue, knowledge base) and customer context so AI agents can act at the individual subscriber level. ACP is included on every plan at no extra cost. The AI bundle, priced as the Postscript AI Plan at $699/mo plus per-message rates of $0.003–$0.30, unlocks Brand Center (train brand voice, knowledge base, offers, catalogue), Infinity Testing (hundreds of on-brand variant tests for campaigns and automations), and Shopper (1:1 agentic marketing journeys). As of August 13, 2026, Shopper Automations ships agentic 1:1 journeys that curate messages from customer behavior and past conversations, with transparent test-vs-control revenue reporting. Marketing plans start at a $0/mo Starter tier with a $49 monthly minimum spend and $0.009/SMS, then Growth at $100/mo, Professional at $500/mo, and Enterprise custom. Email is now live and priced 20–30% below legacy providers. Postscript positions itself against Klaviyo and Attentive as the non-bolted-on option, and keeps an in-house legal team for SMS compliance. This is for Shopify DTC brands that treat retention as a revenue line, not a checkbox.
Behind the Verdict
Postscript's original pitch was narrow on purpose: SMS done properly for Shopify, with no all-in-one sprawl. That has now broadened — RCS is live, email has launched (priced 20–30% below legacy providers), and the company has rebuilt the platform from the ground up as what it calls Postscript 2.0. The foundation of that rebuild is the Agentic Context Platform (ACP), which holds brand context (voice, knowledge base, offers, catalogue) and customer context in one place so AI agents can act at the individual subscriber level. ACP is included on every plan — you pay to message customers, not to store your data. The products that sit on top split into three buckets. First, list growth: Onsite Opt-in (patented, up to 3x more subscribers), Popup Editor with A/B testing, CashBack (a smart coupon alternative with built-in A/B testing that only pays out when the customer redeems), and checkout collection. Second, messaging: a Visual Flow Builder with cart and browse abandonment, welcome, upsell, and shipping templates, unlimited segments, a dedicated toll-free number with custom contact card, and response management for replying to subscribers. Third, the AI layer, sold as the Postscript AI Plan at $699/mo: Brand Center, Infinity Testing, and Shopper. Infinity Testing produces hundreds of on-brand variants for campaigns and automations; Shopper runs 1:1 agentic journeys, and as of August 13, 2026, Shopper Automations curates those journeys from behavior and past conversations with transparent test-vs-control revenue reporting. Strengths: the Shopify data model is the moat — segmentation, attribution windows, and cart/browse triggers are wired directly into Shopify objects rather than bolted on. The list-growth toolkit (especially Onsite Opt-in and CashBack) is genuinely differentiated versus SMS-as-a-checkbox competitors. Compliance is handled in-house with an actual legal team. And the pricing model is honest about its shape: no prepaid balances, no expiring credits, no overages, no auto-upgrades, and carrier fees passed through at cost on their own line. Weaknesses: the floor is real. Starter is $0/mo but a $49 monthly minimum spend applies, and every plan pays per message on top of the subscription — $0.009/SMS and $0.045/MMS on Starter, falling to $0.007/SMS and $0.024/MMS on Professional — plus carrier fees ($0.00330 SMS, $0.00799 MMS, $0.0047 text RCS, $0.0087 media RCS for US 50 states and Canada). Small lists won't clear the minimum and still pay per send. The AI Plan at $699/mo is a meaningful step up and stacks another $0.003–$0.30 per-message rate depending on product and message type; if Shopper and Infinity Testing won't move revenue enough to justify that, the entry tiers are the right call. And the build is still Shopify-only — WooCommerce, BigCommerce, and other platforms are out of scope. Where it fits: DTC brands already on Shopify for whom SMS or RCS is a primary retention channel, brands that want agentic 1:1 marketing without
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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.
Set up an SMS abandoned cart flow using the Visual Flow Builder's built-in Cart Abandonment template, then layer Infinity Testing on the welcome flow to run hundreds of on-brand variants against each other.
Outcome: Test-vs-control revenue reporting shows which variant won, and the winning copy is pushed live without a manual A/B test cycle.
Launch a VIP concierge program where subscribers who reply are routed through response management to a human, while Shopper Automations handles routine 1:1 product questions and recommendations in the background.
Outcome: High-value customers get personalized recommendations without the brand adding SMS headcount, and routine questions are answered around the clock.
Deploy Onsite Opt-in and a Popup Editor form with group A/B testing, then run a CashBack campaign instead of a discount coupon to drive revenue without eroding margin.
Outcome: Subscriber list grows from onsite and checkout opt-ins, and CashBack only pays out when customers actually redeem, protecting profit margin on each conversion.
Use Cases
- Run an SMS abandoned cart flow triggered minutes after abandonment with Shopify revenue attribution.
- Build a VIP concierge program where high-CLV customers receive personalized product recommendations over text.
- Use Infinity Testing to test hundreds of on-brand SMS variants for Black Friday campaigns.
- Capture SMS opt-ins via Onsite Opt-in, checkout collection, and post-purchase to grow the list up to 3x faster.
- Deploy Shopper Automations to run agentic 1:1 journeys that adapt to subscriber behavior and past conversations.
- Launch CashBack campaigns to drive revenue and list growth using a coupon alternative with built-in A/B testing.
- Automate post-purchase upsell and shipping updates using Shopify order data.
- Segment subscribers by LTV, product affinity, or engagement for targeted win-back campaigns.
Models Under the Hood
as of 2026-09-22
Limitations
- Postscript is built for Shopify stores — non-Shopify platforms (WooCommerce, BigCommerce) are out of scope.
- Every plan carries per-message rates ($0.009/SMS and $0.045/MMS on Starter, down to $0.007/SMS and $0.024/MMS on Professional) plus carrier fees passed through at cost ($0.00330 SMS, $0.00799 MMS, $0.0047 text RCS, $0.0087 media RCS for US 50 states and Canada), and Starter enforces a $49 monthly minimum spend.
- The Postscript AI Plan adds $699/mo plus per-message rates of $0.003–$0.30 depending on product and message type.
- International coverage beyond US 50 states and Canada is not documented on the published pricing page.
as of 2026-09-29
Verification history
We have re-verified Postscript 20 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.
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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
Ideal for
Shopify brands getting their first SMS program off the ground, or testing SMS as a channel before committing to a paid tier.
What this tier adds
Starting tier: $0/mo with a $49 monthly minimum spend, campaigns, automations, unlimited segments, dedicated toll-free number, and 2 opt-in keywords.
Growth
$100/mo
Ideal for
Brands actively building an SMS program with a growing subscriber list and the need for unlimited opt-in keywords.
What this tier adds
Adds unlimited opt-in keywords, live chat and email support, and lower per-message rates ($0.008/SMS, $0.03/MMS) versus Starter.
Professional
$500/mo
Ideal for
Brands scaling SMS into a top revenue channel who need API access, enhanced analytics, and white-labeled opt-ins.
What this tier adds
Adds enhanced analytics, priority live chat and email support, API access for custom integrations, and removes "Powered by Postscript" from opt-ins.
Enterprise
Custom
Ideal for
Brands ready to make SMS their #1 revenue channel, with contact-sales custom pricing and dedicated support.
What this tier adds
Adds a dedicated Customer Success Manager, personalized messages with custom product recommendations, Data Warehouse Push, and the option to add RCS.
Postscript AI Plan
$699/mo
Where the pricing makes sense
The company stage and team size where Postscript's pricing actually pencils out — and where peers do it cheaper.
Fits Shopify DTC brands doing enough SMS or RCS volume to clear the $49 monthly minimum and benefit from paid tiers — Starter ($0/mo + $49 minimum), Growth ($100/mo), Professional ($500/mo), and Enterprise (custom). The Postscript AI Plan at $699/mo is priced for brands where AI-driven 1:1 journeys and Infinity Testing will measurably move revenue. Compared with Klaviyo or Attentive, Postscript undercuts on per-message SMS rates and claims 20–30% lower email pricing than legacy providers;
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.
Most Shopify brands can install the app, sync Shopify data, and turn on a prebuilt flow like Cart Abandonment or Welcome in under an hour. Getting a dedicated toll-free number registered and compliance-approved for US SMS typically takes a day or two. Brands enabling the Postscript AI Plan — Brand Center voice training, Infinity Testing, and Shopper — should budget a week or more to populate the
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: import subscriber lists and rebuild flows in the Visual Flow Builder, then confirm opt-in language and compliance before your first send.
- →From Attentive: port your subscriber list and opt-ins, re-create campaigns and automations as Postscript flows, and re-register your toll-free number via the platform's compliance team.
- →From a Klaviyo email + SMS setup: keep Klaviyo for email if you want, or move both — email is now a live Postscript channel priced 20–30% below legacy providers.
- ↗To Klaviyo: export subscribers and campaign history, then rebuild SMS and email flows in Klaviyo's flow builder.
- ↗To Attentive: export your list and creative assets, and re-negotiate per-message rates for the higher volume you're bringing over.
- ↗To a free-forever SMS tool: expect to lose AI features (Brand Center, Infinity Testing, Shopper), Shopify-native segmentation, and Onsite Opt-in during the move.
Integrations
Resources & Guides
Tutorials & Learning
YouTube returned 6 videos for “Postscript”, and we withheld 6: 6 could not be judged, because “Postscript” is a single word that other videos use for other things. We are showing none, because we could not prove any of them are about Postscript.
Official links
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