Klaviyo spent the first half of 2026 shipping AI agents and quietly reorganizing how it sells itself. Both changes matter if you are deciding where to put your ecommerce retention budget, and both are routinely described incorrectly in roundup posts that guess at plan names. This review sticks to what Klaviyo's own pricing page, billing documentation, and product announcements actually say.
Klaviyo charges by active profiles, not by named feature tiers
The single most common mistake in Klaviyo write-ups is inventing tier names like "Starter," "Growth," or "Pro" with feature checklists attached. Klaviyo does not work that way. Your bill is driven primarily by the number of active profiles in your account, with send volume layered on top.
Klaviyo's billing documentation defines a billable profile as one that is "still eligible to receive marketing from you." That is broader than most merchants assume: any profile that can be emailed through Klaviyo counts as active regardless of consent status. Someone who entered an email address at checkout and never formally opted in still counts against your total. Suppressed and deleted profiles drop off the billable count once they are fully processed, which makes list hygiene a direct cost lever rather than a nice-to-have.
Email allowances scale with the profile tier you sit in — Klaviyo's documentation describes send limits as a multiple of your plan's profile ceiling, and its published entry configuration pairs 500 profiles with 5,000 monthly email sends. Klaviyo counts anything that leaves the system: delivered and bounced emails both draw down the allowance, while skipped sends do not.
If you exceed your profile ceiling with auto-upgrade enabled, Klaviyo moves you to the next tier automatically and notifies the account owner. You stay there until you actively downgrade. For a store with seasonal signup spikes, that is the mechanic most likely to produce a surprise invoice.
What the product lineup looks like now
Rather than one email product with an SMS toggle, Klaviyo now organizes itself into separate purchasable lines: Klaviyo Marketing (email, SMS, WhatsApp, social, reviews), Klaviyo Service (support tooling), and a data and analytics layer. Composer and Customer Agent are sold as their own line items alongside those, with Professional Services and Enterprise routed through sales. Budgeting for Klaviyo in 2026 means pricing a bundle, not picking a row on a grid.
The free plan is real, and genuinely limited
Klaviyo's free tier covers up to 250 active profiles, 500 email sends per month, $5 of mobile messages per month, and 10,000 Composer credits. You get the drag-and-drop editors, basic segmentation and automations, reporting dashboards, a basic Customer Hub self-service portal, and basic helpdesk ticketing. Email support is included for the first 60 days only.
That is enough to build and test a welcome series and an abandoned-cart flow against real traffic. It is not enough to run a store doing meaningful volume, which is the point. Paid plans begin in the low tens of dollars per month at the smallest profile tier and climb steadily; third-party pricing trackers consistently put mid-list accounts in the low hundreds per month, but the only figure worth planning against is the quote Klaviyo's own plan estimator returns for your profile count.
Mobile messaging is a prepaid dollar bundle
This is another spot where secondhand summaries go wrong. Klaviyo does not sell SMS as a fixed message quota bolted to an email tier. Mobile messaging runs on a dollar-based prepaid model — you commit to a monthly amount, and rates vary by channel (SMS, MMS, WhatsApp), destination region, and number type. Carrier fees are bundled into the rate rather than billed separately. Critically, unused dollars do not carry over month to month, so over-committing is pure waste and under-committing throttles your sends mid-campaign.
The 2026 AI release: Composer and Customer Agent
On July 1, 2026, Klaviyo moved its two flagship agents into public beta after a private beta that included AS Beauty, Spanx, and Dermalogica.
Composer builds campaigns from natural-language prompts — Klaviyo's example is "run a winback campaign for lapsed VIP customers with a 20% incentive." It also audits existing flows, segments, and forms and returns a ranked list of revenue opportunities. Klaviyo says the model draws on 14 years of performance data across more than 193,000 brands. The most credible endorsement so far is operational rather than creative: AS Beauty's senior director of retention marketing described Composer's visibility into collision issues across a 113-flow automation library as "unbelievable."
Customer Agent handles order tracking, order editing, subscription management, returns and exchanges, and loyalty lookups across chat, SMS, email, and WhatsApp. Klaviyo's marketing claims it resolves 65% of questions autonomously — a vendor figure, unaudited, and worth treating as a ceiling rather than a baseline.
Generally available versus still in beta
Klaviyo's feature announcement is unusually clear about maturity, which is useful when you are evaluating. Generally available: expanded Customer Agent retail skills, Agent Guidance (tone, escalation rules, decision boundaries), omnichannel agent coverage, RCS branded messaging, Personalized Send Time, and Next Best Product recommendations for mobile channels. Klaviyo reports a 35% lift in click rate on top campaigns using Personalized Send Time. Still in beta: Audience Optimization Refine, which predictively drops high-unsubscribe-risk profiles before send.
The practical read: the service-side automation is shippable today, while the headline campaign-generation agent is beta software you should pilot on a low-stakes flow before trusting it with peak season.
How it stacks up against the obvious alternative
Mailchimp remains the default comparison, and its SMS story has changed enough that older comparisons are stale. Mailchimp SMS is an add-on requiring the Essentials plan or higher, now available across 37 countries and territories including 34 in Europe after its 2026 expansion. MMS, however, remains restricted to the US and Canada, and SMS programs require an application and approval before you can send.
Klaviyo's edge is not channel count — it is that the ecommerce data model is native rather than bolted on, and that the agents read from the same customer record the flows do. Klaviyo's own framing, via CMO Jamie Domenici, is that most AI tools fail because they "can't act on the context that matters."
Is it the best option for ecommerce?
For Shopify and WooCommerce stores where retention revenue is a tracked line item, Klaviyo is still the strongest default, and the 2026 agent release widens that lead on the service side. It is a poor fit if you have a large, low-engagement list — profile-based billing punishes exactly that shape — or if you need annual prepay discounts, which Klaviyo does not offer.
Run the plan estimator with your real active-profile count before comparing anything. Most disappointment with Klaviyo pricing traces back to counting subscribers when Klaviyo is counting profiles.