SMS abandonment campaigns deliver ROI when messages arrive before checkout expires and avoid carrier spam filters. Three platforms dominate: Klaviyo bundles SMS with email, Attentive positions as an enterprise solution with AI-driven journeys, and Postscript (pricing unknown) focuses on e-commerce. The stakes: deliverability during peak shopping windows, compliance tooling to avoid TCPA exposure, and transparent cost-per-message at scale.
How we approached this
We reviewed vendor pricing pages, feature lists, and integration documentation published as of July 2026. Klaviyo and Attentive publish feature roadmaps and plan details; Postscript's pricing requires direct inquiry. We did not conduct independent deliverability testing. Claims about deliverability, compliance features, and integrations reflect vendor-published specifications only.
Klaviyo
Klaviyo's pricing page lists a free plan (up to 250 profiles, 500 emails/month, 150 SMS credits, 10,000 Composer AI credits). Paid plans start at $45/mo for combined email and SMS; the vendor markets unified customer profiles, 350+ app integrations, and AI-powered subject line generation. Channels include SMS, email, RCS, WhatsApp, mobile push, and social. The platform targets retail, restaurant, wellness, and enterprise segments. Deliverability and compliance details are referenced in marketing materials but no SLA or filtering-rate data is published.
Klaviyo
- +Free tier includes 150 SMS credits and email sends
- +Unified customer profiles across SMS, email, push, RCS, WhatsApp
- +350+ integrations (Shopify, WooCommerce, BigCommerce, loyalty, POS)
- +AI-powered campaign composer and subject line generator included
- +Transparent pricing structure for email+SMS bundles
- −No published deliverability SLA or carrier filtering metrics
- −Free tier limited to 250 profiles (restrictive for growth brands)
- −SMS credit overage pricing not detailed on public pages
- −AI tools (Composer, Customer Agent) add 30% premium on top tiers
Attentive
Attentive's pricing page states plans are modular, based on message volume, subscriber list size, number of channels (SMS, email, RCS, push), and AI tool selection. No base price is published; the vendor requires a demo for quotes. Feature set includes patented two-tap sign-up, 150+ integrations, Attentive Signal identity tag, cross-channel journeys, A/B testing, TCPA compliance tools, and multi-availability-zone deliverability infrastructure. Case studies cite 20x–88x ROI for retail, food/beverage, and entertainment clients. Strategic support, onboarding, and 24/5 service are included with all plans.
Attentive
- +Multi-channel packaging (SMS, email, RCS, push) with unified journeys
- +150+ integrations, including Shopify, loyalty, and POS systems
- +Published case studies: 20x–88x ROI for retail and entertainment brands
- +Built-in TCPA compliance tools and multi-availability-zone deliverability
- +Strategic support, onboarding, and 24/5 service included in all plans
- −No published pricing; requires demo for quote
- −Targets enterprise segment; SMB cost-feasibility unclear
- −AI tools (AI Pro, AI Grow, AI Journeys) pricing opaque
- −No free tier or trial period mentioned on pricing page
Postscript
Postscript's pricing and feature details are not available in the research bundle. The vendor page was unreachable. Contact Postscript directly for pricing, deliverability specifications, and integration support. No claims about message volume, compliance tooling, or ROI can be substantiated from public sources.
Postscript
- +Vendor details unavailable
- −No published pricing or feature list in research bundle
- −Vendor page unreachable; transparency concern
- −Cannot verify deliverability, compliance, or integration claims
Verdict
- For early-stage e-commerce brands testing SMS abandonment: Klaviyo's free tier (150 SMS credits, 500 emails, unified profiles) offers lowest risk and transparent upgrade path at $45/mo.
- For enterprise retailers scaling cross-channel campaigns (SMS, email, RCS, push): Attentive's modular pricing, strategic support, and published ROI case studies justify the demo-required quoting process.
- For brands prioritizing pricing transparency and avoiding vendor lock-in: Klaviyo publishes plans, integrations, and channel costs; Attentive does not.
- For compliance-sensitive verticals (finance, health): Both Klaviyo and Attentive list TCPA tools; Attentive's multi-availability-zone infrastructure may reduce carrier filtering risk during peak sends.
- For revenue-per-text optimization: Attentive's AI Journeys and case studies (20x–88x ROI) suggest advanced segmentation; Klaviyo's Composer AI requires separate pricing tier (30% premium).
What we'd skip
- Postscript until pricing and feature documentation is published. Opaque pricing creates budget risk and prevents apples-to-apples comparison.
- Attentive for sub-$50K annual marketing spend brands. Vendor targets enterprise; demo-required pricing suggests cost floor above SMB budgets.
- Klaviyo's AI add-ons (Composer 30% OFF, Customer Agent 30% OFF) if you're on the free tier. Test core SMS abandonment first; AI tools add complexity and cost before ROI is proven.
