SMS in Ecommerce Remains Replaceable
Brian Whalley, Co-Founder of Wonderment, on Klaviyo's product-market fit
The real story is that SMS in ecommerce still behaves like a replaceable point solution, not a locked in system of record. Merchants switch between Attentive, Postscript, and Klaviyo because text messaging carries real variable cost, and the winner is often the platform that clears a brand’s must have workflows at the lowest spend. Klaviyo is stronger when merchants want email, SMS, and customer data in one place, while Postscript wins when a Shopify brand wants a cheaper, more SMS focused tool.
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Usage was split almost evenly across Klaviyo SMS, Postscript, and Attentive in Wonderment’s customer base, which suggests no single product had locked up the channel. That kind of even share usually means merchants feel able to swap vendors without rebuilding their whole marketing stack.
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The switching pressure is stronger in SMS than email because the bill is tied much more directly to message volume and carrier costs. Postscript positioned itself around per message pricing with fewer hidden fees, which made it easier for merchants to benchmark cost against use case coverage.
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Klaviyo’s advantage was not pure SMS depth, it was that a merchant already had purchase history, segments, and automation logic sitting inside the same system. That makes Klaviyo stickier for brands that want one tool to trigger abandoned cart emails, texts, and follow ups from the same customer record.
This market keeps moving toward bundles. As SMS features converge, stand alone vendors need lower prices or sharper product depth to keep merchants from folding text into a broader platform. The long term winners are likely the companies that make messaging feel less like buying texts and more like operating a full customer data and retention engine.