Comparison

Klaviyo vs Postscript

Last updated 2026-04-08

How they compare

Different tools for different channels. Klaviyo is primarily an email platform with SMS add-on capabilities. Postscript is SMS-first with deep Shopify integration for text marketing. Most stores need email as the foundation, making Klaviyo the default choice. Add Postscript if SMS is a major revenue channel and you want dedicated SMS features.

Want the full breakdown? Read our in-depth Klaviyo vs Postscript guide with real pricing at different volumes and practical recommendations.

Score breakdown

Klaviyo8/10
Postscript7.5/10
Starting priceFree tierFree tier
Pro price$45/mo$100/mo
Overall
8/10Best
7.5/10
Ease of use
7/10
8/10Best
Value for money
8/10
8/10
Shopify
10/10
10/10
Amazon
2/10Best
0/10
Platforms
Shopify
Shopify
Free trialYesYes

Best for

Klaviyo

Best all-in-one email and SMS platform

Shopify store owners serious about email and SMS marketing

+Best-in-class Shopify integration
+AI subject line generator
+Powerful segmentation
+Free up to 250 contacts
-Gets expensive as list grows
-Steep learning curve
-Amazon integration is limited

Postscript

Best dedicated SMS marketing for Shopify

Shopify stores that want SMS as a dedicated revenue channel, not just a bolt-on to email

+Built exclusively for Shopify with deep integration
+AI-powered Infinity Testing across thousands of message variants
+Two-way conversational commerce with Shopper AI
+Free Starter plan with pay-per-message pricing
-Shopify only, no other platforms supported
-US and Canada only for SMS delivery
-Per-message costs add up at high volume
-Revenue attribution can overcount

Our verdict

Klaviyo -- 8/10

The gold standard for Shopify email marketing. The AI features are a nice bonus, but the real value is in the data-driven segmentation.

Postscript -- 7.5/10

The specialist SMS platform for Shopify. If SMS is a serious revenue channel for your store, Postscript's AI testing and conversational commerce features give it an edge over the SMS add-ons in Klaviyo and Omnisend.

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Frequently asked questions

Is Klaviyo free?
Yes, up to 250 active contacts with 500 email sends and 150 SMS credits per month. Enough to set up core flows and test whether email marketing works for your store.
How much does Klaviyo cost for 10,000 contacts?
Roughly $150/month for email only. Add SMS and the cost goes higher depending on message volume and country. Pricing scales with your list size.
Klaviyo vs Omnisend - which is better for Shopify?
Klaviyo has deeper Shopify integration and more powerful segmentation. Omnisend is cheaper and easier to learn. For stores serious about email revenue, Klaviyo. For stores wanting simplicity, Omnisend.
Does Klaviyo work with Amazon?
Barely. Amazon does not share customer email addresses or purchase data the way Shopify does. The integration exists but provides almost no useful functionality.
Can Klaviyo send SMS?
Yes, on the Email + SMS plan. SMS pricing varies by country. US SMS is the most cost-effective. International SMS credits cost more per message.
Is Klaviyo hard to learn?
The basics (setting up flows, sending campaigns) are straightforward. The advanced segmentation and analytics have a real learning curve. Expect a few weeks to feel comfortable with the full feature set.

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