Klaviyo
Email and SMS marketing platform focused on ecommerce.
Alternatives · 2026
Alternatives to Postscript
SMS marketing platform purpose-built for Shopify stores.
3 hand-curated alternatives from MintedSaaS's directory. See the Postscript listing →
Postscript is an SMS marketing platform built specifically for Shopify stores. It lets merchants send targeted text messages to customers based on purchase history, browsing behavior, and engagement signals. The platform handles compliance (TCPA, GDPR, SMS opt-in laws), list segmentation, and conversion tracking from click to purchase. Postscript is purpose-built for the e-commerce flow—it integrates directly with Shopify's product catalog, order data, and customer profiles, so campaigns reference real inventory and buying patterns without manual data syncing.
Merchants typically turn to Postscript when they want SMS as a dedicated channel, separate from email. It suits brands that treat SMS like a core marketing lever rather than an add-on notification tool. The buyer is usually a Shopify store owner or marketing manager with a list of hundreds or thousands of customers, looking to recover abandoned carts via text, drive flash sales, or re-engage lapsed buyers. Postscript appeals to operators who need channel-specific reporting (SMS ROI, opt-in rates, cost per conversion) and don't want to split SMS sends across multiple platforms.
What we offer that competes
Attentive
Conversational SMS and email marketing for consumer brands.
Customer.io
Behavioural messaging across email, SMS, push, and in-app.
What to look for
- Whether the platform syncs Shopify orders and customer data automatically without manual CSV uploads or API calls.
- Whether segmentation can use purchase history, order frequency, or customer lifetime value as targeting criteria.
- Whether SMS campaigns are reported separately from email, showing revenue and ROAS per channel.
- Whether the platform offers a free tier or trial that lets you test SMS flows before committing budget.
- Whether the platform enforces TCPA opt-in rules and manages consent withdrawal automatically.
- Whether you can run SMS, email, or both channels from the same platform without switching dashboards.
FAQ
What should I look for in an SMS marketing platform for Shopify?
Check whether the platform syncs Shopify customer and order data automatically, offers Shopify-native flows (like abandoned cart recovery), provides TCPA-compliant opt-in and consent handling, and gives you segmentation based on purchase history or behavior. Strong reporting should break down SMS revenue separately from other channels.
Are there free alternatives to Postscript?
Klaviyo has a free tier that includes SMS for up to 500 contacts, though advanced automation and detailed SMS reporting live behind paid plans. Customer.io and Attentive are paid-only platforms with no free tier; they charge based on contact volume or sent messages.
What are the best alternatives to Postscript?
Attentive, Klaviyo, and Customer.io all support SMS for e-commerce. Attentive focuses on AI-driven personalization and mobile-first campaigns. Klaviyo combines SMS with email, offering unified segmentation across both channels. Customer.io is strongest for custom automation workflows and detailed event tracking on non-Shopify platforms.
Can I use SMS marketing outside of Shopify with these alternatives?
Klaviyo and Customer.io support SMS on any e-commerce platform or custom storefront. Attentive also integrates with Shopify, WooCommerce, Magento, and custom systems. Postscript is Shopify-exclusive, so if you run on a different platform, the alternatives are necessary.
How do I compare SMS platforms on price?
Postscript charges per SMS sent or per subscriber. Klaviyo uses contact count. Attentive charges per user or per conversation. Customer.io charges per tracked contact. Calculate your expected monthly sends and subscriber count, then run pricing calculators on each platform's site to see which aligns with your budget.
Which SMS platform has the easiest Shopify integration?
Postscript was built for Shopify first, so it has the tightest integration and requires almost no setup beyond installing the app. Klaviyo and Attentive also integrate cleanly via Shopify App Store but may require more initial configuration of flows and rules.
Do these SMS alternatives offer email automation too?
Klaviyo and Customer.io bundle SMS with email, letting you run cross-channel campaigns from one platform. Attentive focuses primarily on SMS and web push, with lighter email tools. Postscript is SMS-only and pairs well with email platforms like Klaviyo or Drip.
What compliance features matter most for SMS marketing?
Look for TCPA opt-in validation, GDPR consent handling, automatic unsubscribe management, and audit trails of consent changes. All of these alternatives—Attentive, Klaviyo, and Customer.io—enforce TCPA and GDPR rules; Postscript does the same within Shopify.