Attentive vs Postscript for SMS Marketing (2026)

Updated 2026-10-24 · 1037 words

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Quick verdict: if you're Shopify-only and want to see real numbers before you commit, Postscript publishes its pricing and plugs directly into Shopify's order and customer data. If you're running (or planning) a larger, multi-platform SMS program and want a plan sized around your actual volume by a sales team rather than a self-serve tier, Attentive is built for that scale, with deeper compliance tooling and two-way texting to match. Here's how the two actually compare for running an SMS program in ecommerce.

Postscript and Attentive start from different assumptions about who's buying. Postscript lives inside the Shopify App Store, installs for free, and tells you exactly what you'll pay before you send a message. Attentive sells through a demo and a contract, with pricing that depends on your SMS volume and contact list rather than a fixed tier — a structure built for mid-size and enterprise brands, not a seller testing their first text campaign.

Comparison table

Round 1: pricing and how you actually buy it

Postscript's pricing is public. Its Shopify App Store listing shows a free-to-install Starter tier with a monthly minimum spend commonly cited around $49, a credit for your first 30 days, and a published per-message rate (roughly $0.009/SMS, with MMS and carrier fees billed separately). Higher tiers add features and lower per-message rates as volume grows, and you can model your likely bill before installing anything. Attentive publishes none of this. Its pricing is consumption-based — driven by SMS volume and email contact count — and set through a sales conversation and contract. Third-party estimates of what brands actually pay vary enormously, from a few hundred dollars a month to several thousand, which tells you less about Attentive's real cost than it does about how little is public. If a fixed, visible number matters to you before you commit, Postscript is the only one of these two that gives you one.

Round 2: platform fit

This is the hard constraint, not a preference. Postscript only works on Shopify and Shopify Plus — there's no version for any other platform, and that focus is deliberate, not a gap it's filling later. Everything about its segmentation and setup assumes Shopify order and customer data. Attentive supports Shopify but isn't limited to it, which matters in two cases: your store doesn't run on Shopify at all, or you want one SMS platform that would survive a future platform migration. If you're Shopify-only today and plan to stay that way, this difference doesn't move the decision much. If either of those two conditions applies, it removes Postscript from consideration outright.

Round 3: AI copy and campaign tooling

Both platforms use AI to help draft SMS copy that fits the format's tight character limits and conversational tone — neither is pasting in email copy and calling it done. Postscript's AI tooling is built around its Shopify-native segments, generating copy and campaign suggestions from the same order and customer data its segmentation already uses. Attentive's AI features extend a bit further into broader campaign strategy and personalization, consistent with a platform built for brands running SMS as a primary, high-volume channel rather than a secondary one. In practice, the gap here is smaller than the pricing and platform differences — most sellers won't choose between these two on AI copy quality alone.

Round 4: two-way texting and compliance depth

Both platforms support two-way conversational texting rather than one-way broadcast-only sends, letting a customer reply and continue the exchange. Attentive's version, along with its compliance tooling — consent tracking, opt-in flow granularity — is generally considered the more built-out of the two, which tracks with the kind of brand it typically serves: higher volume, more contacts, more regulatory exposure to manage. Postscript's TCPA tooling covers the essentials a standard Shopify SMS program needs — opt-in capture at checkout, unsubscribe handling, quiet hours — competently, but without quite the same depth. A brand sending a moderate volume of compliant campaigns is well served by either; one managing heavy volume across a large list leans toward Attentive's deeper tooling.

Which should you pick?

• Shopify-only store, want to see real pricing before committing: Postscript — the published rate card and free install make it the lower-friction starting point.
• Multi-platform brand, or not on Shopify at all: Attentive is the only one of the two that's even an option.
• Established SMS program with real volume and revenue to justify a bigger commitment: Attentive's deeper compliance tooling and two-way texting are more likely to earn back its price at that scale.
• You're not sure yet: start with Postscript if you're on Shopify — the low-risk entry price will tell you within a few campaigns whether SMS deserves a bigger investment, and you can revisit Attentive once volume justifies the sales conversation.

If you're also weighing how either tool stacks up against an email-first platform adding SMS as a feature rather than a core channel, our Klaviyo vs Postscript for SMS marketing and Klaviyo vs Attentive for SMS marketing comparisons cover that angle for each platform individually. And since email usually sits right next to SMS in a seller's marketing stack, our best AI email marketing tools for ecommerce roundup covers that side separately. Whichever platform you pick, SMS marketing carries specific legal requirements under the Telephone Consumer Protection Act — the FCC's TCPA consumer guidance is worth reading before your first campaign goes out. Try Postscript if transparent, self-serve pricing on Shopify is the priority, or try Attentive if you need multi-platform support and a plan sized to real volume.

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