Klaviyo Review: B2C CRM, K:AI, Pricing, Features and Limits

Klaviyo's most important current change is not another email-writing button. Composer has moved into public beta as a conversational marketing agent inside the B2C CRM. It can inspect account data, answer performance questions, audit work that already exists, and draft new campaigns, flows, messages, and segments. The wider K:AI layer now sits across marketing, personalisation, service, analytics, integrations, and customer data. Klaviyo's July 30 explanation frames this as the operating intelligence of the platform rather than a separate AI product.

That distinction matters. A generic copy generator sees a prompt and perhaps a brand guide. Composer can work with campaign history, segment logic, flow structure, form behaviour, account performance, and the customer data already connected to Klaviyo. A marketer can ask why a welcome flow is underperforming, request a pre-send check, or describe a winback goal in ordinary language. Composer can then return a prioritised audit or build an editable first draft in the same system where the work will eventually run.

The public-beta boundary is equally important. Klaviyo's current Help Center says Composer does not send, publish, or change account content automatically. It recommends, drafts, and performs quality checks, while the user reviews and approves every result before it goes live. Output quality can vary. Klaviyo's Terms say AI output can be inaccurate, unreliable, misleading, incomplete, inappropriate for the context, or similar to output generated for another customer. The useful mental model is an account-aware assistant with production access nearby, not an infallible autonomous marketing director.

Composer currently has two broad modes. Analyse and audit can review account performance, flows, forms, templates, campaigns, text messages, segments, accessibility, design, structure, compliance signals, and deliverability risks. Create can draft email, SMS, MMS, and push campaigns, assemble flows and their messages, and translate natural-language audience descriptions into editable segments. Those capabilities can remove repetitive setup, but they do not verify inventory, promotion terms, product claims, legal disclosures, audience consent, links, accessibility, margin, or customer expectations. Every launch still needs an accountable owner.

Access is credit-based. New customers automatically receive 10,000 Composer credits for up to 90 days, whichever limit is reached first. The current paid entry is advertised at an introductory $14 per month for 2,000 credits. Different actions use different amounts, and Klaviyo warns that a complex request can cost more than the published estimate. The user sees consumption after an action runs rather than a guaranteed price before execution. Paid credits expire each billing period without rollover, while unused free credits roll into the first paid month only if the account upgrades before free access ends.

This changes the buying calculation. The free Klaviyo plan still supports up to 250 active profiles and 500 emails per month, but Composer's 10,000-credit allowance is not a permanent free entitlement. Teams should test representative audits and builds during the 90-day window, record what each task consumes, then estimate the monthly credit tier from real work. A short question, an account-wide analysis, and a multi-message flow should not be treated as equal units.

K:AI extends beyond Composer. Klaviyo lists more than forty predictive and generative capabilities across customer lifetime value, churn risk, expected next order, product recommendations, channel affinity, send timing, audience optimisation, forms, personalised campaigns, translations, image editing, review sentiment, deliverability monitoring, and anomaly detection. These features can help a small team turn customer data into more relevant decisions. They also create a governance obligation: Klaviyo says core machine learning and predictive analytics cannot be fully opted out of, although many sparkle-marked generative features are optional.

Customer Agent is the service-side counterpart. It uses product, policy, customer, order, and interaction context to answer questions, recommend items, track orders, complete supported retail tasks, and hand off to a person. The current setup guide lists web chat, email, SMS, and WhatsApp. It also describes multilingual replies, prebuilt skills, custom tools in open beta, guidance controls, simulations, and human escalation. The billing model starts at $50 per month for 75 shopper-initiated conversations that the agent resolves end to end. Any email or mobile-message usage alongside a conversation can still add separate charges.

One documentation conflict is worth recording. Klaviyo's March billing guide says Customer Agent is available on SMS, web chat, and email, with WhatsApp and RCS coming soon. Newer Customer Agent documentation says WhatsApp is live and explains the required verified Meta account. WhatAI treats the current product guide as the feature baseline and the older billing sentence as stale, but buyers should verify channel availability inside their own account and country before committing. Product access, sender approval, Meta rules, mobile-message rates, and Customer Agent conversation charges are separate questions.

Klaviyo has also opened more of the agent layer to developers. Customer Agent APIs can read and update configuration, inspect production conversations, pull performance reports, and run the agent for one turn in another surface. Those endpoints remain beta and are explicitly described as not intended for production. The required revision header currently uses a July 15 pre-release value. A team can prototype powerful support workflows, but it should expect schemas to change and avoid making a beta interface the only path for a critical customer operation.

The remote MCP server adds another route. Klaviyo publishes connectors for ChatGPT and Claude and a remote MCP endpoint that can expose account tools through OAuth. Administrators can set read-only mode, restrict toolsets, disable tools that read user-generated content, limit the core tool set, and optionally enable beta capabilities. Read-only is false by default. That makes setup convenient, but it also means a casual connection can expose write-capable tools. Customer messages and other user-generated text can contain hostile instructions, so the safe starting point is read-only, least-privilege scopes, disabled unnecessary content tools, visible approvals, call logging, and a rollback plan.

Data and AI terms are clearer than many marketing products, but still require procurement review. Klaviyo says customer data is not used to train third-party foundation models and says external model providers are contractually prohibited from using customer prompts for training. Customers retain inputs and own outputs to the extent permitted by law. The Terms separately allow Klaviyo to create aggregated data that does not identify the customer, another entity, or a person, then use that derived data for service improvement, product development, research, and marketing. The subprocessor list includes OpenAI and Anthropic for AI functionality and customer support, plus AWS for hosting.

AI is only one line in a modular bill. Profiles and Email scales with marketable profiles and sends. Mobile Messaging uses prepaid monthly spend and per-message rates. Reviews, Social Marketing, Customer Hub, Helpdesk, Customer Agent, Marketing Analytics, Advanced KDP, Composer, support, and professional services can each add another unit. The highest public number in this WhatAI entry is $9,100 per month, drawn from Klaviyo's own Advanced KDP example for two million profiles. It is not a ceiling on enterprise spend.

WhatAI's take: Composer makes Klaviyo more compelling for a B2C team that already trusts its customer data and spends meaningful time auditing, segmenting, building flows, and checking campaigns. The value comes from context and execution proximity, not from AI copy alone. The same proximity raises the stakes. Use the beta to measure real time saved, preserve human approval, protect consent and deliverability, test Customer Agent with hard cases, restrict agent permissions, and model every billing unit before treating K:AI as a reason to consolidate the customer stack.

WhatAI Decision Box

Klaviyo combines B2C customer data, email, mobile messaging, automation, analytics, service, reviews, social marketing, and AI agents. This WhatAI review separates the permanent free plan from profile pricing, message spend, product add-ons, Composer credits, and enterprise costs.

Klaviyo is strongest when ecommerce events, purchase history, consent, behaviour, service interactions, and campaign results need to drive one customer journey. The trade-off is operational complexity: every channel needs lawful consent and reliable data, while profiles, messages, tickets, conversations, orders, AI credits, and add-ons can each affect the bill differently.

Klaviyo has a free tier for 250 active profiles and 500 monthly emails. Paid Marketing scales by active profiles and sends, mobile channels use message spend, and service, analytics, Reviews, Social Marketing, Advanced KDP, and Composer can add separate charges. It best fits B2C teams prepared to manage data quality, deliverability, consent, AI review, and modular billing.

Use Cases

Pricing varies by plan and region — see current pricing.

Plan features change — last updated: 2026-08-09.

Klaviyo Pros & Cons

How to Get Results with Klaviyo: Step-by-Step Workflow

1. Define the lifecycle outcome

   Choose one measurable customer outcome such as first purchase, abandoned-cart recovery, repeat purchase, churn reduction, review collection, or support deflection. Define the eligible audience, excluded audiences, success metric, guardrail, and accountable owner.

2. Map data and lawful consent

   List every source, event, profile field, catalog item, consent state, tracking purpose, region, retention rule, and recipient right needed for the workflow. Do not import purchased, affiliate-shared, or otherwise unconsented lists.

3. Model the full monthly bill

   Count active and total profiles, email sends, mobile destinations and segments, service tickets, resolved AI conversations, Reviews orders, Composer actions, analytics add-ons, short codes, services, taxes, and possible overages.

4. Connect the minimum data set

   Start with the commerce platform and only the integrations required for the first workflow. Use scoped OAuth or API access, document field ownership, validate event names and timestamps, and prevent duplicates before expanding.

5. Authenticate and warm sending

   Configure branded sending, SPF, DKIM, DMARC, sender registration, suppression, consent, and preference handling. Follow a volume and reputation plan before activating large lists or a dedicated IP.

6. Build a narrow segment and flow

   Use one verified trigger, clear filters, quiet periods, Smart Sending where appropriate, exclusions, a control group, and explicit stop conditions. Preview the exact people who qualify before enabling messages.

7. Use AI as a reviewed draft

   Ask Composer to analyse or draft, then verify audience logic, prices, claims, products, inventory, links, legal text, accessibility, tone, and deliverability. Nothing should go live without an accountable human approval.

8. Test every customer path

   Use test profiles across consent states, devices, countries, channels, order histories, loyalty states, and failure conditions. Confirm tracking, coupons, handoffs, unsubscribes, replies, service escalation, and data writes.

9. Launch gradually and monitor

   Begin with a small eligible audience. Monitor delivery, bounce, complaint, unsubscribe, conversion, attribution, agent resolution, escalation, bad recommendations, profile growth, credit usage, and billing changes.

10. Review, document, and govern

    Compare results with a control, record changes and approvals, suppress unengaged profiles where appropriate, review integrations and permissions, schedule pricing checks, and preserve an emergency pause and rollback process.

Klaviyo Gotchas and Limits to Know Before You Start

• Klaviyo is a modular B2C CRM, not one all-inclusive email subscription.
• The free plan is limited to 250 active profiles and 500 email sends per month.
• Free-plan email support lasts only for the first 60 days.
• The 10,000 free Composer credits expire after 90 days or when consumed, whichever happens first.
• Composer paid pricing starts at an introductory $14 per month for 2,000 credits and can change.
• Composer credit usage is dynamic, and complex actions can exceed the upper end of published estimates.
• Paid Composer credits expire each billing cycle without rollover.
• Composer is a public beta and does not publish, send, or change account content without user approval in the current documentation.
• AI output can be inaccurate, incomplete, misleading, non-unique, or inappropriate and requires human review.
• Klaviyo's embedded machine learning and predictive analytics cannot be fully opted out of, although many generative features are optional.
• Profiles and Email pricing depends on both billable active profiles and email sends.
• A profile may count as active even when it did not explicitly subscribe if it remains eligible to receive marketing.
• Suppressing profiles can take up to 72 hours to change the billable count.
• Profiles and Email does not automatically downgrade after profile cleanup.
• Paid plans renew monthly and fees are generally non-refundable.
• Some plans can auto-upgrade, use flexible overages, or continue charging beyond a minimum commitment.
• Mobile Messaging spend resets monthly and unused dollars do not roll over.
• Mobile message cost varies by country, channel, sender type, encoding, and number of segments.
• Emojis and special characters can reduce SMS segment length and increase cost.
• Failed mobile deliveries can be billable even when they do not reach the recipient.
• Short-code subscriptions are billed separately from ordinary Mobile Messaging spend.
• WhatsApp template charges follow Meta's model and still consume Klaviyo mobile-message spend.
• The current Customer Agent guide lists WhatsApp as live, while the March billing article still says coming soon.
• Customer Agent starts at $50 for 75 resolved conversations, and associated email or mobile messages can add separate charges.
• Helpdesk starts at $10 for 50 tickets and can charge overages rather than simply stopping.
• Customer Hub starts at $20 and is priced by active profiles.
• Reviews starts at $25, requires a paid Email plan, and is limited to Shopify and WooCommerce in current billing documentation.
• Marketing Analytics starts at $100 and is not included in the base Profiles and Email plan.
• Advanced KDP is priced by total profiles, including suppressions and non-subscribers, rather than only marketable profiles.
• The $9,100 value encoded as priceMax is an Advanced KDP example for two million profiles, not a maximum bill.
• Advanced KDP can add usage fees when total profiles exceed the selected tier.
• Social Marketing is separately priced by active profiles and currently uses introductory-price language.
• Attribution is a configured model, not proof that a Klaviyo message alone caused revenue.
• Open tracking is on by default until account-level or recipient-level controls are changed.
• Turning off recorded opens does not remove the tracking pixel and can affect reporting, segments, flows, and attribution.
• Email and SMS consent are separate, and a phone number alone is not SMS marketing consent.
• Lead-generation, purchased, affiliate-related, or shared lists are not valid SMS consent in Klaviyo's guidance.
• Klaviyo tools support compliance but do not provide legal advice or make the merchant automatically compliant.
• Customer Agent conversations are stored against a shopper profile when one exists.
• Customer Agent can make product, policy, order, or action errors unless knowledge, tools, guidance, and escalation are tested.
• Customer Agent APIs remain beta and are not intended for production under current documentation.
• The remote MCP server defaults to read-only false unless the connection URL is configured otherwise.
• MCP tools that read user-generated content can expose an external model to prompt-injection attempts.
• ChatGPT and Claude listed connectors do not expose every MCP query-parameter control available to a custom connector.
• API keys, OAuth apps, scopes, webhooks, and third-party integrations can expose or modify customer data and require least privilege.
• Klaviyo says customer data is not used to train third-party foundation models, but the Terms allow aggregated non-identifying derived data for several business purposes.
• OpenAI and Anthropic appear on Klaviyo's current subprocessor list for AI features and customer support.
• Most listed hosting locations are in the United States, so organisations must verify residency and transfer requirements.
• Pre-GA, beta, and limited-release features can change and may not receive the same commitments as generally available services.
• The supplied URL contains another publisher's Impact tracking identifiers and a transient click ID, so it should not be reused as WhatAI's affiliate link unless ownership and terms are verified.

Which Klaviyo Feature Fits Your Use Case

Starter Prompts for Klaviyo

What is Klaviyo?

Klaviyo is a B2C CRM and customer-experience platform that joins customer data with email, SMS, RCS, WhatsApp, mobile push, web experiences, automation, analytics, reviews, service, and embedded AI. It is used most often by ecommerce and consumer brands that need behaviour and purchase data to drive personalised marketing and support.

Is Klaviyo free?

Yes. The permanent free plan supports up to 250 active profiles and 500 email sends per month, plus $5 in mobile-message spend. It includes core marketing, reporting, basic Customer Hub and Helpdesk capabilities, and email support for the first 60 days. Composer's 10,000 free credits are time-limited to 90 days, so they should not be confused with an indefinite AI allowance.

How much does Klaviyo cost?

There is no single representative paid price. Profiles and Email scales with billable active profiles and sends. Mobile Messaging uses prepaid spend and per-message rates. Composer starts at an introductory $14 for 2,000 credits, Customer Hub at $20, Helpdesk at $10, Customer Agent at $50, Reviews at $25, and Marketing Analytics at $100. Advanced KDP and enterprise use much larger profile-based or contractual prices.

Why is priceMax set to $9,100?

Klaviyo's billing guide uses $9,100 per month as the example price for an Advanced KDP tier covering two million profiles. It is the highest explicit official monthly plan figure encoded in this entry, not a cap on Klaviyo or enterprise spending. Add-ons, messaging, usage fees, services, taxes, and contracts can push the total higher.

What counts as an active or billable profile?

Klaviyo describes a billable profile as an active profile that remains eligible to receive at least one type of marketing. This can include people added through checkout or engagement even when they did not expressly opt into email. Suppressed and deleted profiles generally stop counting after processing, but Advanced KDP is priced by total profiles, including suppressed and non-subscribed profiles.

Does Klaviyo automatically downgrade after profiles are removed?

The core Profiles and Email plan does not automatically downgrade simply because the account suppresses or deletes profiles. The billable count can take up to 72 hours to refresh, then an administrator must select a lower eligible tier more than 24 hours before renewal. Some other profile-based add-ons follow different automatic adjustment rules.

What is Klaviyo Composer?

Composer is Klaviyo's public-beta AI marketing agent. It can answer account questions, analyse performance, audit campaigns, flows, forms, templates, segments, SMS content, accessibility and deliverability, then draft campaigns, flows, messages, and segments. Current documentation says it does not send or publish anything without user review and approval.

How do Composer credits work?

New customers receive 10,000 credits for up to 90 days, whichever limit is reached first. Paid access starts at an introductory $14 per month for 2,000 credits. Action costs are dynamic and can exceed published estimates for complex work. Paid credits expire at the end of each billing period without rollover.

What can Klaviyo Customer Agent do?

Customer Agent can answer brand and product questions, recommend products, track orders, process supported returns or exchanges, manage selected subscription or loyalty tasks, and escalate to a human. Current product documentation lists web chat, email, SMS, and WhatsApp, with channel setup and regional requirements applying separately.

Is Customer Agent fully autonomous?

It can handle supported shopper conversations and actions automatically after configuration, but autonomy is bounded by knowledge, tools, guidance, permissions, channel rules, integrations, and escalation logic. Klaviyo provides simulations, audit trails, and guidance controls. Teams remain responsible for testing responses, monitoring failures, protecting customer data, and keeping human escalation available.

Does Klaviyo use customer data to train AI models?

Klaviyo's current Terms say customer data is not used to train third-party foundation models, and its AI page says external providers are contractually prohibited from training on customer prompts. The Terms separately allow aggregated, non-identifying derived data for service improvement, product development, research, and marketing. Procurement teams should review the DPA and subprocessor list for their exact use.

Which AI providers does Klaviyo use?

Klaviyo says it combines in-house machine learning with external services such as OpenAI and AWS Bedrock. Its current subprocessor list includes OpenAI and Anthropic for AI features and functionality, plus AWS for cloud hosting. The provider and processing path can depend on the feature and contract.

Can Klaviyo AI make mistakes?

Yes. Klaviyo's Terms say AI output may be inaccurate, unreliable, misleading, incomplete, inappropriate, or similar to output generated for another user. Composer documentation also instructs users to review its work. Marketers must verify claims, prices, promotions, audiences, links, consent, legal disclosures, accessibility, deliverability, and brand language before publishing.

Does Klaviyo have an API and MCP server?

Yes. Klaviyo publishes REST APIs, webhooks, OAuth, private API keys, developer documentation, a remote MCP server, a ChatGPT app, and a Claude connector. The MCP server supports read-only mode, tool scopes, user-content restrictions, core-tool mode, and beta tools. Its default read-only setting is false, so administrators should configure least privilege deliberately.

Is Klaviyo compliant with GDPR or CCPA?

Klaviyo provides a DPA, consent fields, suppression, access and deletion tooling, tracking controls, and privacy documentation intended to help customers meet obligations. Klaviyo acts as a processor for customer personal data in many workflows, but the merchant remains responsible for its lawful basis, notices, consent, targeting, tracking, disclosures, retention, recipient rights, and local legal advice.

What security certifications does Klaviyo publish?

Klaviyo says it undergoes annual third-party audits aligned with SOC 2 and ISO 27001. Its trust page also displays ISO 27017 and PCI DSS badges and documents MFA, SSO, JIT provisioning, roles, API scopes, penetration testing, and a bug bounty. Buyers should obtain the current reports and verify product, region, and contract scope.

Does Klaviyo have an affiliate program?

The supplied URL contains Impact-style affiliate tracking, so an affiliate advertising route exists. Klaviyo also operates an application-based agency and technology partner program with referral, co-sell, and management fees governed by private program guides. WhatAI did not verify a public self-serve affiliate application with a current commission rate, cookie window, payout threshold, and universal eligibility.

Is Klaviyo better than Mailchimp or Omnisend?

Klaviyo is usually the stronger fit when deep ecommerce data, behavioural segmentation, predictive metrics, lifecycle flows, service context, and modular B2C products justify the cost and operational work. Mailchimp can be simpler for newsletters and broad small-business marketing. Omnisend can be easier for ecommerce teams that want a narrower email and SMS package with more straightforward packaging. Test both migration and real monthly cost.

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