Klaviyo vs Mailchimp

Klaviyo and Mailchimp both send email, but they price and build for different businesses. Klaviyo charges only by active-profile count, with no seat limit, and sells native SMS, an AI campaign composer and ecommerce-specific tools as add-ons on top. Mailchimp charges by contact-count band inside four named plans, Free, Essentials, Standard and Premium, that also cap how many people can log in. Every figure below comes from Klaviyo’s and Mailchimp’s own pricing and comparison pages, checked on 26 September 2026 and 27 September 2026.

Which one actually costs less at your list size?

At the smallest paid tier the gap is close: Klaviyo’s Email plan costs $20 a month for 500 active profiles, and Mailchimp’s Essentials plan starts at $13 a month for up to 500 contacts. The three real bills show where that gap actually goes. A solo operator with about 1,000 contacts pays $30 a month on Klaviyo against $26.50 on Mailchimp. At 10,000 contacts and a five-person team, Klaviyo reaches $150 while Mailchimp reaches $135, for a different reason than list size alone: Mailchimp’s Essentials plan caps out at 3 seats, so a five-person team needs Standard regardless of how few contacts it has. Klaviyo charges nothing extra for the fourth or fifth person on the same account; its price only moves with profile count. At 50,000 contacts and roughly fifteen people, Klaviyo’s bill is $860 and Mailchimp’s is $815. Klaviyo’s number is pushed up by send volume, not list size: the 50,000-profile tier includes 500,000 emails a month, but around twelve campaigns to the full list adds up to roughly 600,000, so the plan has to move up a tier. Mailchimp’s number is pushed up by that same fifteen people needing seats Standard doesn’t have, not by the 50,000 contacts, which Standard’s own published range could otherwise handle on a cheaper plan.

Does your business run on Shopify or WooCommerce data?

Klaviyo describes itself as a “B2C CRM” built on unified customer profiles, with flows that read a contact’s real order and browsing history from an integrated store, mainly Shopify or WooCommerce. Its Reviews add-on, $25 a month for up to 250 orders, is scoped specifically to those two platforms’ order volume, and SMS is a native, usage-priced channel: outbound US toll-free texts cost $0.01 per segment, carrier fees included, on top of whichever Email plan you’re on. Mailchimp takes a more general approach. Purchase-behavior tracking and personalized product recommendations are included on every Mailchimp plan, even Free, but there’s no Shopify- or WooCommerce-specific add-on comparable to Klaviyo’s Reviews, and Mailchimp’s SMS and MMS marketing has no published flat rate at all: it requires an application and a separate monthly credit purchase, with the per-message cost varying by the country you’re sending to. A store running Shopify or WooCommerce gets more of what it specifically needs from Klaviyo’s side of this comparison. A business that just wants to send newsletters, announcements or service reminders without a product catalog behind them gets little extra value from Klaviyo’s ecommerce-specific pieces, and risks paying for Composer, Customer Hub, Social Marketing and Reviews add-ons it never touches.

What isn’t included in the sticker price?

Klaviyo’s Email plan is only the start of the bill for a lot of accounts. Composer, its AI marketing-agent add-on, is $20 a month flat on top of any Email plan, and its own overage runs $10 for every extra 1,000 AI credits once you exceed the plan’s allotment. Customer Hub and Social Marketing add $20 and $38 a month respectively at the tiers we checked, though both prices are time-limited introductory pricing set to run only through the end of this month, off higher list prices. None of the four add-ons is required to send email, but a Klaviyo account that wants all of them is paying five separate line items: the Email plan plus each add-on, not one bundled fee. Klaviyo is also specific about what happens if you outgrow your tier: profile counts over your current tier trigger an automatic move to a pricier, profile-compliant tier at the next billing cycle, whether or not you opted into that upgrade path. Mailchimp’s version of this problem is less transparent, not necessarily more expensive: every plan card carries a footnote that overage charges apply once you exceed your contact or send limit, but neither Mailchimp’s pricing page nor its plan-comparison page states what that overage actually costs per contact or per email.

Where most advice gets this wrong

Most head-to-head write-ups line the two plans up by exact contact count and call whichever number is lower the winner. That misses what’s actually forcing each bill. Klaviyo’s price moves only with active profiles and email volume; add a person to your team and the bill doesn’t change. Mailchimp’s price moves with contacts, but its seat caps sit underneath that: 3 seats on Essentials, 5 on Standard, and only Premium removes the limit. A team of five needing shared access to one list can end up on Mailchimp’s costlier available plan at a contact count Essentials would otherwise cover for less, and no comparison chart that stops at “contacts” shows that. The other place advice goes wrong is treating “more capable” as “the right pick.” Judged purely on feature depth, Klaviyo is the more built-out platform: native SMS with a published per-segment rate, an AI campaign composer, ecommerce-specific add-ons Mailchimp has no equivalent for. None of that is in dispute. But most of the businesses reading this comparison aren’t running a Shopify or WooCommerce store, and for them, Klaviyo’s ecommerce-specific machinery is a cost line that never gets used, not a reason to pay more. The honest read isn’t “Klaviyo is the better tool, so pick it”; it’s “pick the platform built for what you’re actually selling, and don’t pay for integrations you have no catalog to connect.”

Who gets a trial, and who’s stuck with the bill they signed up for?

Klaviyo doesn’t offer a time-limited trial of a paid plan; it offers a free-forever plan instead, capped at 250 active profiles, so you can use the real product indefinitely before ever entering a card number for a paid tier. Mailchimp works the other way: Essentials and Standard both come with a self-serve 14-day free trial, but valid payment information is required at enrollment, and the account is billed automatically the moment the trial ends unless you cancel first. Premium skips that self-serve trial in favor of a separate one-month trial arranged through Mailchimp’s sales team for qualified customers only. Billing commitment differs too. Klaviyo’s self-serve plans run month to month by credit card with no contract; only accounts spending enough across Klaviyo’s products to cross its own manual-billing threshold can move to an invoiced contract instead, with monthly, quarterly, semi-annual or annual cycles available once you’re there. Mailchimp runs month to month below 10,000 contacts on every plan, and adds an annual pre-pay option worth about 15% off once Essentials or Standard passes that mark, or from the very first tier on Premium. Klaviyo’s page is also explicit about cancelling: doing it immediately forfeits the rest of that paid month with no refund, so cancelling at the end of the billing cycle instead is the only way to use what you already paid for; Mailchimp’s pages don’t state an equivalent policy either way.