Klaviyo vs Postscript
A detailed breakdown of Klaviyo and Postscript for e-commerce sellers. Last updated 2026-04-01.
Quick verdict
Klaviyo scores highest overall (8/10), but the best choice depends on your use case.
Klaviyo8/10 | Postscript7.5/10 | |
|---|---|---|
| Starting price | Free tier | Free tier |
| Overall score | 8/10Best | 7.5/10 |
| Ease of use | 7/10 | 8/10Best |
| Value for money | 8/10Best | 8/10Best |
| Shopify | 10/10Best | 10/10Best |
| Amazon | 2/10Best | 0/10 |
| Platforms | Shopify | Shopify |
| Free trial | Yes | Yes |
How they compare
What is Klaviyo?
Klaviyo is the dominant email and SMS marketing platform for Shopify stores. Its deep Shopify integration means it pulls in order data, browsing behaviour, and customer profiles automatically, giving you segmentation capabilities that generic email tools cannot match. The AI features handle subject line generation, send-time optimisation, and predictive analytics.
What is Postscript?
Postscript is an SMS marketing platform built exclusively for Shopify. Unlike Klaviyo and Omnisend which treat SMS as an add-on to email, Postscript treats it as a dedicated revenue channel with its own AI tools, automation engine, and conversational commerce features. Over 18,000 Shopify brands use Postscript, including Dr. Squatch and Brooklinen, and the platform reports an average 34x ROI on SMS spend.
Key differences
- •Klaviyo scores 8/10 overall versus 7.5/10 for Postscript.
- •Klaviyo is significantly stronger for Amazon sellers.
Klaviyo
Postscript
Which is best for you?
Choose Klaviyo if...
The gold standard for Shopify email marketing. The AI features are a nice bonus, but the real value is in the data-driven segmentation.
Choose Postscript if...
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.
Our verdicts
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.