Klaviyo is the most-installed app on Shopify, found on more than one in three stores we scan, and it is the runaway leader in email marketing. It earns that position with a specific strength: it treats Shopify as a live data feed rather than a contact importer, so purchases, cart additions, and browsing behavior flow straight into its segmentation engine and build your audience automatically. The verdict upfront: for a store with repeat purchasers and a real email list, Klaviyo is the strongest retention platform on Shopify, and it holds a 4.7 out of 5 App Store rating. The honest catches are cost, which scales with your list, and the fact that its power is wasted if you never build the flows. It is also worth knowing that its share, while huge, has been slipping lately.<\/p>\n
If you are a repeat-purchase, direct-to-consumer brand that lives on email and SMS, Klaviyo is usually the right call and the one to grow into. If you are pre-launch, tiny, or unlikely to configure it properly, you may be paying for infrastructure you will not use. The sections below use live detection data to show how dominant it is, what makes it different, what it costs, and where it falls short.<\/p>\n
Key Takeaways<\/div>
1<\/div>
Klaviyo is an email and SMS marketing app, and it is the single most-installed app on Shopify as well as the clear leader in email marketing.<\/div><\/div>
2<\/div>
Its edge is architecture: it uses Shopify as a live data feed, so purchase, cart, and browsing signals build segments automatically instead of relying on form fills.<\/div><\/div>
3<\/div>
It holds a 4.7 out of 5 App Store rating, but its monthly detection has been slipping recently, a trend worth watching for an app at this scale.<\/div><\/div>
4<\/div>
It is expensive on the wrong footing: pricing scales with your contact list, and an under-configured account means paying for power you are not using.<\/div><\/div>
5<\/div>
Best for repeat-purchase, direct-to-consumer brands in apparel, health and beauty, and subscriptions that have a real email list and will build proper flows.<\/div><\/div><\/div>\nKlaviyo on the Shopify App Store, with its 4.7 rating and free-to-install pricing. Source: Shopify App Store.<\/figcaption><\/figure>\n
What is Klaviyo?<\/h2>\n
Klaviyo is an email and SMS marketing platform for Shopify. Store owners use it to collect subscribers, segment their audience, and send automated flows and campaigns, from welcome series and abandoned-cart reminders to post-purchase and win-back messages. It also handles SMS, sign-up forms and popups, and reporting that ties messages back to revenue. It is the most-installed app in our dataset, and its nearest email competitor is on a fraction as many stores. Here is how dominant it is.<\/p>\n
34.4%<\/div>
Share of stores in our dataset<\/div><\/div>
#1<\/div>
Popularity rank<\/div><\/div>
9.2<\/div>
Avg apps on their stores<\/div><\/div><\/div>
Based on Shopify stores in our dataset \u00b7 Last updated August 19, 2026.<\/p>\n
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