KWI, the retail technology platform powering point of sale, order management, and merchandising for multi-location specialty retailers, today announced the availability of the KWI Klaviyo Connector. The integration syncs customer profiles, transaction history, and POS and web sales data from KWI directly into Klaviyo, giving retail marketing teams a unified view of customer behavior across in-store and online channels. 

For most specialty retailers, in-store and eCommerce purchase data live in separate systems. Marketing campaigns get built on partial information. High-value customers get the same message as first-time visitors. Slow-moving inventory gets moved with broad promotions instead of targeted outreach. The KWI Klaviyo Connector addresses this directly by connecting the two systems and putting complete purchase data to work inside Klaviyo, the AI-first platform combining marketing, service, and analytics

"Retailers have always known that relevant, timely outreach drives better results than broad campaigns," said Sam Kliger, CEO of KWI. "The problem has been data. In-store purchase history sitting in one system, online behavior in another, and no practical way to act on the full picture. The KWI Klaviyo Connector closes that gap. Your marketing team can see everything, segment on what actually matters, and reach the right customers before the moment passes." 

With the connector in place, retailers can capture email and SMS subscriptions at point of sale and sync them to Klaviyo in real time, trigger automated welcome and post-purchase flows from in-store or online transactions, segment customers by lifetime value, total spend, and cross-channel purchase history, build campaigns based on specific products or item categories purchased, identify customers most likely to buy similar products to support inventory sell-through, and track revenue across store and eCommerce activity inside Klaviyo. 

John Varvatos was among the first to put the integration to work. When the team identified excess inventory in Henley sweaters ahead of a key holiday weekend, they used the KWI Klaviyo Connector to build a targeted email segment based on customers' documented purchase history of similar products. The campaign went out timed around an incoming storm. No broad promotion. No wide discounting. 

"Through the John Varvatos KWI–Klaviyo connector, we’re able to activate highly targeted, data-driven marketing built on real customer purchase behavior. When we identified excess inventory in our larger-size Henley sweater, we analyzed historical sales patterns to pinpoint the customers most likely to respond. We then launched a personalized email campaign timed strategically around a key holiday storm weekend, when demand for seasonal knitwear was naturally elevated. The result was a 23% lift in sales of the Henley sweater and a highly efficient inventory sell-through—demonstrating how the right blend of customer insight, timing, and technology can translate directly into meaningful business impact," said Nick Barbarise, North America IT Director, John Varvatos/All Saints. 

The KWI Klaviyo Connector is available now. Existing customers can contact their KWI Customer Success Manager to get started. Full documentation is available in the KWI Knowledge Base.