The email landed in a knitter's inbox at an interesting moment. She'd browsed a $120 merino yarn weeks earlier—never bought it, never clicked again. But the algorithm had been watching. When a comparable skein dropped to $80, she got the alert. Not for the product she'd viewed, mind you. For something similar enough that the software decided she might care.
That kind of lateral thinking doesn't come naturally to most email marketing platforms, which tend to operate like well-trained but somewhat literal dogs: good at following commands, less impressive at improvisation. Copenhagen-based Hello Retail is betting it can change that calculus. This month, the company released Product Agents, a suite of six autonomous email tools that replace rigid lifecycle flows with what the company calls "product-aware decision-making." Early returns from yarn retailer YarnLiving—up to six times higher revenue per email compared to standard Klaviyo upsell flows—suggest the approach might have legs. Though one customer's enthusiasm, of course, doesn't make a trend.
Six specialists, one shared goal
The system deploys half a dozen agents, each with a narrow mandate. Three monitor pricing. One tracks items a shopper viewed. Another watches products they purchased and might repurchase. The third—arguably the most intriguing—alerts customers when an alternative or related product goes on sale, even if they never encountered it. Browsed a winter coat that stubbornly held its $120 price? If a similar style drops to $80, the agent notices.
The remaining three focus on post-purchase choreography. One calculates replenishment windows product by product, not by broad category. Another suggests close alternatives after a view or purchase, filtering out anything the customer already owns. The last waits before pitching accessories, sidestepping the immediate post-checkout barrage that annoys as often as it converts.
Each message gets generated individually: subject line, preview text, body copy, call-to-action. Merchants can set brand voice and tweak prompt outputs field by field. It's customization, but within guardrails.
The product graph underneath
Hello Retail has been building what it calls Product Intelligence since 2023—a system that converts product titles, images, and descriptions into vector embeddings to map relationships. Which items substitute for each other. Which complement. How often something gets repurchased. Typical discount patterns. That product graph already powers search and recommendations across the company's existing modules. Now it drives the timing and selection logic for these email agents.
The system infers product lifecycles from observed behavior rather than requiring merchants to manually tag "consumable" or set reorder intervals. Coffee subscriptions renew every twenty-one days, dog food every forty-five? The agents learn that from purchase history and adjust send windows accordingly. When a shopper repurchases ahead of schedule, the queued email cancels automatically. It's reactive, not prescriptive.
Klaviyo as the delivery layer
Product Agents routes messages through a brand's existing email service provider—Klaviyo, most often. Merchants connect their Klaviyo account, create a flow to receive the agent-generated messages, and configure templates with their usual design. The system respects Klaviyo's smart sending rules, though credits get consumed when a message is handed off to the ESP, even if Klaviyo throttles delivery afterward. A minor point, perhaps, but one that could matter for brands watching their cost per send.
Pricing follows a consumption model: one successfully delivered message consumes one credit, shared across all six agents. When multiple agents compete to send at the same time, built-in prioritization picks a winner. Test mode is free—messages only go to test addresses—and Hello Retail's support documentation walks through the Klaviyo setup, including API key permissions and flow configuration.
What Klaviyo can't do (yet)
Klaviyo offers price-drop flows for viewed products and replenishment flows with manual timing heuristics. What it doesn't offer, at least in documented native triggers, is that alternative-product price alert—the agent that monitors related items and notifies when a comparable SKU discounts, regardless of whether the original was viewed. It also doesn't automate per-product replenishment timing the way Product Agents does. Klaviyo's replenishment flows typically rely on merchant-set delays: send twenty-five to thirty days after purchase, that sort of thing.
That lifecycle-aware timing, combined with the product-relationship graph, is the technical differentiation. Ecaterina Capatina, who wrote Hello Retail's February 2 announcement blog, frames it as "Agentic Commerce"—autonomous decision-making at the product level rather than segment- or rule-level triggers. Whether that term catches on remains to be seen. The tech industry has a long history of ambitious nomenclature.
The company supports integrations with Magento, WooCommerce, Shopify, PrestaShop, and a tail of Nordic and European platforms, including Norce, Centra, and Litium. Requirements include product and order data flowing into Hello Retail, the company's on-site script, and an ESP—typically Klaviyo, though webhook setups are available for brands with in-house development resources.
Live now, data later
Product Agents went live in Hello Retail's Winter Release 2026, announced February 2 and formally unveiled February 4 with an on-demand webinar featuring CPO Philip Andersen, CMO Rasmus Leth Skjoldan, Capatina, and PM Julius Altenburger. The company lists agency partners Dtails, Clarify, Bluemint, and Segmento on the product page, positioning it as a tool for Klaviyo specialists and retention-focused agencies to deploy.
The YarnLiving case—that 6× revenue lift—is the only public benchmark so far. No independent reviews or analyst coverage has surfaced, which isn't surprising for a product barely ten days old. Hello Retail, founded in 2013 by Kasper Refskou Jensen and Brian Petersen, carries a 4.5-star Trustpilot rating across general customer-service reviews, though none yet specific to Product Agents.
Credit pricing details aren't published on the main pricing page. The company describes it as "consumption-based" and refers prospects to support documentation for the credit model. Transparency could be clearer there. But for DTC brands already running Klaviyo and frustrated with rigid timing rules or missed opportunities on alternative products, the pitch is straightforward enough. The agents are live. The integration is documented. And at least one early adopter is reporting multiples on revenue per send.
Whether that holds at scale—or whether Klaviyo and its peers develop their own versions of lateral-thinking automation—is the real question. For now, Hello Retail has a head start. And in software, that sometimes matters more than a finish line.
