At a glance
A Shopify-native SMS marketing platform for list growth, automated flows, campaigns, two-way conversations, and the "Shopper" AI shopping assistant. 100% focused on SMS (with MMS/RCS) for Shopify merchants, with a stated 130M+ subscriber Onsite Opt-in Network.
Who it fits
Best forShopify DTC brands of all sizes that want SMS as a serious revenue channel and value Shopify-specific depth.
Skip ifNon-Shopify merchants; brands that need multi-channel marketing (email + push + WhatsApp) in one platform; very small lists where flat-rate ESPs are cheaper.
Pros & cons
- Pure-play SMS focus + deep Shopify integration
- Strong segmentation (45+ Shopify-specific filters)
- Compliance engine reduces TCPA risk
- New monthly platform fee + per-message charges frustrate longtime users
- Slow human support replaced by AI bot
- Shopify-only — no WooCommerce or BigCommerce
Pricing
Starting price
$49/mo
- up to
- —
- Model
- usage-based
Pricing source: 2026-05-30
Features
Infinity Testing
AITest hundreds of on-brand SMS variants automatically for campaigns and automations
- AI kind
- AI generates and ranks message variants
- plan
- Postscript AI Plan (premium AI bundle)
Shopper (1:1 AI shopping assistant)
AIAI-powered 1:1 SMS shopping assistant that answers questions and drives purchases
- AI kind
- conversational commerce AI
- plan
- Postscript AI Plan
Conversation Intelligence
AIExtracts insights from SMS conversations to inform marketing and product decisions
- AI kind
- NLP analysis of two-way SMS
- plan
- Postscript AI Plan
CashBack (smart coupon alternative)
Pay incentives only when customers redeem them, protecting contribution margin
- plan
- All paid plans
Postscript Plus (managed service)
Done-for-you managed SMS marketing with expert strategists
- plan
- ADD-ON / Managed service tier
SMS Sales (human-agent SMS sales team)
Dedicated SMS sales agents that proactively engage subscribers via text
- plan
- SMS Sales add-on ($0/mo + $25 min spend)
Usage-Based Billing
Flexible pay-per-message pricing instead of fixed monthly tiers
- plan
- Starter $0/mo+$25 min / Growth $100/mo / Pro $500/mo / Enterprise custom
4x ROI Guarantee
Money-back guarantee promising 4x ROI on SMS spend
- plan
- All plans
Dedicated Short Code Support
Carrier-direct DSC at cost ($750/mo passed through with no markup)
- plan
- Available on all plans (carrier fees)
Built-in TCPA Compliance
List growth and messaging hard-wired to TCPA, carrier, and regulatory rules
- plan
- All plans
Shopify-Exclusive Integration
Native deep Shopify integration; does not support BigCommerce / Magento / WooCommerce
- plan
- All plans
Shopify integration
Yes — deep native Shopify integration; Shopify App Store; built specifically for Shopify and Shopify Plus; subscriber sync via Shopify customer data
Integrations
External platforms
- Shopify
- Meta
- TikTok
Rating breakdown
Ease of use
8.8/10
[I] inferred
Features
8.7/10
[I] inferred
Value
7.5/10
[I] inferred
Support
9.0/10
[I] inferred
External ratings
G2
4.8/5
159 reviews
Shopify App Store
4.5/5
1,187 reviews
What operators say
“I LOVED Postscript. And then this year they instituted a new monthly charge in ADDITION to charges per message sent.”
Shopify App Store · 2026
“Working with Postscript is truly a privilege. The team support they provide, the ability to reach them anytime and get a response, was crucial for me.”
Shopify App Store · 2026
“Customers receive a lot of marketing these days, and SMS is a fantastic tool for increasing visibility with your customer base.”
G2 · 2025
Our verdict
The data points to a clear specialist profile: Shopify DTC brands that want SMS as a serious revenue channel and value Shopify-specific depth over multi-channel breadth. Postscript is 100% Shopify-focused — no WooCommerce, no BigCommerce — and that constraint is the differentiator, not a limitation. The Shopper 1:1 AI shopping assistant (paid AI plan) and the SMS Sales human-agent layer are credible add-ons for high-AOV verticals. Two operational realities matter more than the entry tier. First, pricing shifted in 2025-2026 from pure usage-based to monthly platform fee + per-message usage. Operator backlash is documented: "I LOVED Postscript. Then this year they instituted a new monthly charge in ADDITION to charges per message sent" (Shopify App Store 2026). The 4× ROI guarantee mitigates risk on paper but doesn't change the cash-flow rhythm. Second, sub-$20K MRR makes the math hard — at low list sizes the platform fee dominates and a flat-rate ESP with bundled SMS (like Omnisend) is cheaper. For non-Shopify merchants, multi-channel-from-one-platform needs, or brands operating primarily outside North America, Attentive's broader enterprise lane or Omnisend's bundled stack are structurally a better fit. G2 (4.8 / 159 reviews) and Shopify App Store (4.5 / 1,187 reviews) corroborate operator satisfaction on the depth-of-integration story.
Related
Head-to-head comparisons
- Postscript vs Attentive
For Shopify-first DTC brands at $50K-$500K MRR — Postscript is the pragmatic specialist pick. Published pricing, 45+ Shopify-native filters, Shopper AI for conversational commerce, and a 4x ROI guarantee. Attentive is the right pick when you operate multi-platform (Shopify + Salesforce + Magento) or are at the enterprise tier where qualifying calls produce custom-quoted pricing. For pure-play Shopify under $1M ARR, Attentive's enterprise-grade infrastructure is over-engineered relative to Postscript's specialist depth. Both ship SMS competently — the differentiator is the platform breadth vs. depth tradeoff. For the full Attentive pricing breakdown ($2-3K quarterly minimum, contract structure), see /pricing/attentive. For the full Postscript pricing breakdown ($49 Starter minimum + platform-fee shift), see /pricing/postscript.
- Postscript vs Klaviyo
Klaviyo and Postscript split cleanly by store maturity and SMS ambition. Below $50K/mo MRR — Klaviyo's bundled SMS inside the free or Email tier is the cheapest, fastest way to test SMS without onboarding a second platform. Above $50K/mo MRR with SMS as a real revenue channel — Postscript's Shopify-only specialist depth (45+ Shopify-specific segmentation filters, compliance engine, 4x ROI guarantee) pays back faster than Klaviyo SMS. The Customer Agent vs Shopper question is misleading: they solve different jobs. Postscript Shopper is pre-purchase conversational AI on SMS; Klaviyo Customer Agent is post-purchase ticket resolution priced separately as a helpdesk product. Don't pick the tool to get the AI agent — pick the tool to get the channel strategy, and the agent fits the job naturally. For the full Postscript pricing breakdown ($49 Starter minimum + platform-fee shift), see /pricing/postscript. For the full Klaviyo pricing breakdown (active-profiles billing trap + Customer Agent $200/mo), see /pricing/klaviyo.
- Postscript vs Tidio
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