Heartly vs Klaviyo

01 · About Klaviyo

What is Klaviyo?

Klaviyo is the dominant email and SMS marketing platform for Shopify and WooCommerce stores. Its core product is segmentation, flow automation, and transactional email. Flash sales surface inside Klaviyo as a campaign template — a scheduled email blast announcing a discount code, with optional countdown rendering inside the email body. The sale itself runs on the merchant's existing storefront.

Heartly is not a Klaviyo replacement. Heartly is the flash sale layer that Klaviyo sends traffic to. Klaviyo writes the email. Heartly hosts the sale page, runs the countdown, syncs the inventory, and publishes the deal to its public marketplace. Merchants keep Klaviyo for email and add Heartly for the sale itself.

02 · Side by side

Feature comparison.

03

Why merchants run both Klaviyo and Heartly

Klaviyo's strength is the inbox. Heartly's strength is the landing page. A typical flash sale flow: Klaviyo sends the announcement email to the segmented list, the email links to a Heartly sale page, the Heartly page runs the countdown and ends the sale when inventory clears. Two tools, one campaign. Merchants who pick only Klaviyo end up sending traffic to a generic Shopify discount page without timer, scarcity, or social proof. Merchants who pick only Heartly miss the email outreach that drives the initial visit.

04

Heartly adds AI discoverability that email cannot

Every Heartly sale gets a public URL on deals.heartly.io that ChatGPT, Perplexity, and Google AI Overviews can crawl and recommend. A shopper asking Perplexity for current shoe deals can discover a Heartly-powered sale and click through. Klaviyo's audience is the email list — bounded by who subscribed. Heartly's audience extends to anyone who asks an AI shopping assistant for a deal in the merchant's category.

05

Real scarcity vs timer in an email

Heartly reads live Shopify or WooCommerce inventory and ends the sale when the last unit ships. The countdown counts real seconds against real stock. Klaviyo embeds a visual countdown inside the email template but the underlying discount code keeps working until the merchant manually disables it. When a shopper clicks the email an hour after the timer hit zero, the code often still applies. Heartly's scarcity is enforced server-side; Klaviyo's is visual.

06

Dual platform — Shopify and WooCommerce

Klaviyo supports both Shopify and WooCommerce. Heartly does too. This parity matters for multi-platform merchants. The differentiation between the two tools is product category — email vs flash sales — not platform reach.

07 · Pricing

Pricing.

Klaviyo pricing scales with contact list size and can exceed $1,000 per month for established stores. Heartly is a flat €29 to €99 per month regardless of contact count, catalog size, or traffic. The two are budget-additive, not budget-competing — merchants typically keep Klaviyo and add Heartly for the sale surface.

Other comparisons.

Last updated April 2026 · Klaviyo website ↗