Klaviyo's Marketing Agent Passed 10,000 Daily Accounts in Three Weeks. That's Only 5%.

Composer, Klaviyo’s AI agent for campaigns, more than doubled its daily active accounts to over 10,000 after an October release to all customers, co-CEO Andrew Bialecki told investors. Weekly usage tripled to 18 million credits.

Those 10,000 accounts are about 5% of Klaviyo’s daily active accounts, a small share of the base. Klaviyo is handing out free credits to widen it, which leaves open what a brand will pay per credit once the giveaway ends and what Composer adds to Klaviyo’s margin.

How much room is left?

Klaviyo sees the room on two axes: more accounts using Composer, and more use inside each account that does. Most customers who have tried the agent have not yet made it part of their routine.

Depth is starting to follow breadth. In the same three weeks, scheduled tasks tripled and custom skills doubled. A skincare brand, Dermalogica, now runs Composer as its final check before every send, and in one case the agent found that nearly one in four recipients of a win-back flow were also getting another flow’s email that week.

Does it pay?

Free Klaviyo accounts that use Composer convert to paid plans at about 1.5 times the rate of those that do not. Among new sign-ups the gap is 50%, the same ratio, and Klaviyo expects it to hold now that its first-time onboarding runs through Composer.

Klaviyo did not give a Composer revenue figure. Bialecki described the Composer conversion figures as “not direct monetization.” Companywide, third-quarter revenue rose 25% to $387.2 million and full-year guidance rose to between $1.537 billion and $1.541 billion, but neither number isolates what Composer earns.

Where else will brands find it?

Klaviyo announced apps inside Shopify and Wix that put Composer in front of merchants within the platforms they already run their stores on. Bialecki said similar integrations with more platforms and agents are in the works, and Klaviyo is adding Composer to its Model Context Protocol connection so it is available on every AI platform.

A marketing team running Composer on free credits can test the price now: which of its scheduled tasks would it keep running if each credit had a cost?