How Killstar achieved 89x global ROI with Klaviyo

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Killstar is a globally recognised fashion and lifestyle brand with a focus on alternative apparel, accessories, and homeware. Founded in the UK in 2010, Killstar has since expanded into Europe and North America, with three bespoke websites serving the respective regions. Klaviyo has been central to Killstar’s marketing growth.

Learn why Killstar chose Klaviyo to strengthen customer relationships and scale internationally

Challenge 

Before switching to Klaviyo in 2023, Killstar used Sail-thru as its CRM platform but felt it was more suited to large enterprises with in-house development teams. It was not intuitive, required significant manual work, and could not match the brand’s need for agile, accessible, self-serve marketing execution. The platform also couldn’t deliver the level of personalisation that Killstar required and wasn’t designed for cross-channel messaging.

The company needed a platform that could handle growth across three regions, create omnichannel experiences across 2 channels—email and push notifications—and allow a smaller team to manage complex workflows.

Killstar’s team also required a centralised system to consolidate fragmented data from various channels such as loyalty programs, wishlists, and other customer touch points into a single platform that could inform marketing and business decisions.

Solution 

Killstar migrated to Klaviyo to enable its small team to deliver personalised, cross-channel communications at scale.   

Through Klaviyo, the company consolidated data from multiple sources, enabling them to access a clear and detail-rich view of customer behaviour. 

With push and email integrated in a single platform, the brand could act on these insights by building consistent journeys across channels without additional tools or operational lift. This also made customer journeys smoother and more cohesive. 

Using push alongside email also allowed Killstar to hone their mobile engagement strategy and gave them an alternative way to reach customers during key shopping moments. Push has quickly proven its value as a performance channel, with Killstar maintaining a 99.7% delivery rate and generating £147,027 in attributed revenue.

Killstar has deployed Klaviyo’s smart translation tools to further enhance their reach within the EU, with language-specific regionalised content delivered by email. Killstar is also exploring Klaviyo’s Marketing Analytics tools to centralise customer data further. 

We needed a platform that could scale with us and still be user-friendly for a small team. Klaviyo has streamlined our work and let us launch personalised flows we just couldn’t do before—like the wishlist price drop, which was a game changer.

Strategy 

Killstar uses Klaviyo to deliver personalised messaging across email and push. They also harness several key integrations to ensure communications are relevant, timely and automated. 

• Innovative omni-channel marketing: Killstar’s omni-channel strategy with Klaviyo seamlessly blends email and high-performing push notifications to create cohesive, cross-channel customer journeys. An example is their multi-channel wishlist price-drop flow that drives fast, high-intent conversions. By activating push directly inside Klaviyo, the brand now delivers real-time, personalised messaging at scale, achieving a 99.7% push delivery rate and unlocking a major new revenue stream across mobile.
• Integrations that drive highly targeted campaigns: Killstar has been integrating Klaviyo with their broader tech stack to sync customer data including reviews, subscriptions, and loyalty information within Klaviyo’s email marketing. This unification has enabled Killstar to create more personalised and targeted campaigns.
• Using AI to deliver data-driven forecasts and increase efficiency: Killstar uses AI features in Klaviyo to more accurately predict date of next purchase forecasts, number of orders, and churn risk. They’re also utilising Klaviyo’s AI-powered Image Remix tool to create visuals in a fast and efficient way. 

Klaviyo’s Remix tool is a huge time saver for myself and our in-house graphics team. We can make small, safe tweaks to our email assets without going back to the graphic team for rework. It’s really intuitive and accurate, if you give the right prompts

The company has also been experimenting with Klaviyo’s Marketing Analytics and the team’s excited that their deeper understanding of intent and purchasing data will help them scale personalisation in 2026 via upsell and cross-sell features.

Incorporating push messaging into Klaviyo alongside email has made our mobile engagement feel complete. It’s helping us reach customers in moments where timing really matters, and we’re already seeing the impact.