VETTED SAAS
Head to head · SMS Marketing

Klaviyo SMS vs Postscript

Both are top ecommerce SMS tools, but they solve different problems. Klaviyo unifies email and SMS across your store data; Postscript is Shopify native and does SMS only, often with sharper texting workflows. If you want one platform for both channels, Klaviyo; if you are Shopify first and want a focused SMS tool, Postscript is a strong, lower friction pick.

Reviewed by M. HALLORAN·Updated JUNE 2026·How we vet
★ Our pick
Klaviyo SMS
92 /100
vs
Challenger
Postscript
90 /100
◂ Klaviyo SMS Advantage Postscript ▸
Klaviyo edges it on unified channels and depth · Postscript counters with Shopify focus and usage friendly pricing.

These are affiliate links marked rel=“sponsored”. We may earn a commission if you buy · it never affects our scores or who wins. Disclosure.

How they score

Criteria Klaviyo SMS Postscript Winner
Automation and flows
92
89
Klaviyo SMS
Shopify SMS depth
88
92
Postscript
Email and SMS in one
95
60
Klaviyo SMS
Deliverability
87
88
Postscript
Value for money
88
89
Postscript
Scale and support
88
86
Klaviyo SMS

Scores are our editorial assessment against the VettedSaaS rubric · not vendor supplied.

Choose Klaviyo SMS if…
+You want email and SMS in one platform
+You rely on deep segmentation
+You sell across more than Shopify
+You want one data model for both channels
Choose Postscript if…
+You are Shopify first
+You want a focused SMS only tool
+You like usage based billing with a free starter
+SMS is your priority channel, not email

Feature by feature

✓ full  ·  ∼ partial  ·  — none
Capability Klaviyo SMS Postscript
Free plan or starter ✓ ✓
Email and SMS in one ✓ —SMS only
Shopify native ∼ ✓
Abandoned cart flows ✓ ✓
Usage based billing ∼ ✓
Advanced segmentation ✓ ∼

Feature support verified as of June 2026 · check the vendor for current details.

Pricing, side by side

Plan plus per message · billed monthly
Klaviyo SMS Our pick
Free plan $0
Email and SMS $35
US SMS credit ~$0.01
Postscript Challenger
Starter Free
Growth $25
Professional $500

Pricing as of June 2026. Both bill messages on usage; Postscript's plans sit on top of per message costs of about $0.015 a US SMS, and its Professional plan starts near $500 a month. Check the vendor for current pricing.

Keep exploring
Best SMS Marketing Software (overall) Klaviyo SMS vs Attentive Best SMS Marketing for Ecommerce Read the Postscript verdict