If you build products for online sellers, it helps to know where they already spend their attention. On Shopify, one answer is unusually clear. A single email and SMS platform has pulled far ahead of every rival, and the size of that lead is a useful signal about how small merchants think about keeping customers.
The one tool most stores agree on
Klaviyo now appears on roughly 34 percent of the Shopify stores tracked by Shop Theme Detector, which makes it the single most installed app in the dataset. To see how lopsided that is, compare the field. The full Klaviyo statistics breakdown puts Omnisend, its closest email and SMS competitor, near 5.7 percent, while Mailchimp barely registers at a fraction of a percent. In a category with dozens of options, one product holds more ground than all the runners up combined.
That kind of concentration is rare. Most software categories look like a long tail of near equal choices. Email and SMS on Shopify looks like a winner and a crowd.
Why sellers pile onto one platform
The pattern makes sense once you look at what these merchants are actually doing. According to the same data, a typical store running Klaviyo carries about nine apps and just over 2,100 products. These are not hobby shops. They are working catalogs with enough order volume that owned channels, the email list and the phone number, become the cheapest way to sell again to someone who already bought.
Paid advertising gets more expensive every year. A shopper you can reach directly, without paying a platform for the privilege, is worth defending. That is the job email and SMS do, and it explains why merchants who take retention seriously tend to standardize on the tool that handles both in one place. The switching cost of moving a subscriber list and years of automation history is high, which is part of why the leader keeps leading.
What the theme pairing quietly tells you
There is a second layer in the data worth reading. The stores running Klaviyo cluster on a familiar set of themes: Dawn shows up on about 13 percent of them, followed by Prestige and Impulse. Dawn is Shopify’s own free theme, and Prestige is a well known paid theme favored by larger brands. Seeing both near the top means Klaviyo is not just a tool for beginners or just a tool for enterprises. It spans the whole middle of the market, from a first store on a free theme to an established brand on a premium one.
For anyone building software or content for this audience, that breadth is the takeaway. The retention minded Shopify seller is not a narrow niche. It is a wide band of businesses at very different sizes, all reaching the same conclusion about owning their customer relationships.
The lesson for anyone building an audience
Step back from Shopify and the point still holds. The merchants winning at repeat business are the ones who collect a direct line to their customers and use it well. An email address or a phone number you own is an asset no algorithm change can take away. App makers, small businesses, and creators building their own products face the same math. Rented attention is expensive and fragile. Owned attention compounds.
Klaviyo’s numbers are simply the clearest proof of that idea in one market. A third of a giant platform’s stores did not settle on the same tool by accident. They settled on it because keeping a customer is cheaper than finding a new one, and because the channel that does the keeping is worth investing in early.
The practical move for a founder is to build that direct line before you think you need it. Start collecting emails and phone numbers from your first hundred visitors, not your first thousand customers. The Shopify sellers who dominate their categories were doing this quietly for years before it showed up in their revenue. Whatever you are building, the instinct is worth copying: get a direct line to the people who care about your work, and treat it as the asset it is.