Tool Introduction

Klaviyo was founded in 2012 in Boston by Andrew Bialecki and Ed Hallen, both previously of Applied Predictive Technologies. The company bootstrapped for its first three years before raising outside capital. Headquartered at 125 Summer Street in Boston, it also operates offices in Denver, San Francisco, London, Dublin, Sydney, Paris, and Singapore, and reports 196,000+ paying customers.

Klaviyo went public on the New York Stock Exchange under the ticker KVYO, pricing its IPO at $30.00 per share on September 19, 2023 and beginning trading on September 20, 2023.

Demo Available?

A sitewide "Get a demo" option routes prospects to a sales-led product walkthrough, and a no-credit-card Free plan serves as an indefinite evaluation path.

Aggregate Rating

4.5/5 stars (based on 5200+ verified reviews across the internet)

Detailed Overview

Klaviyo organizes its product into an AI layer it calls K:AI plus four pillars: Klaviyo Marketing, Klaviyo Service, Klaviyo Analytics, and the Klaviyo Data Platform. Rather than a standalone email/SMS sending tool, Klaviyo combines marketing, service, analytics, and a customer data platform into one product it positions as a B2C CRM built for consumer brands.

What it does

Concrete workflows described on Klaviyo's marketing site include drag-and-drop email/SMS template building, automated flows triggered by customer behavior, multi-step web forms and pop-ups, RFM and predictive-lifetime-value analysis, and omnichannel sending across email, SMS, RCS, WhatsApp, mobile push, and social.

Composer: an AI agent (in beta) that audits campaigns and creates on-brand flows from a single prompt.
Customer Agent: 24/7 AI-powered customer service.
Customer Hub: a branded self-service customer portal.
Helpdesk: ticket management with a shared inbox.
Segment AI: creates complex segments from simple prompts.
Marketing Analytics: revenue attribution and benchmarking compared to 100 peer brands.
Advanced Klaviyo Data Platform (CDP): unified, real-time customer profiles.

Who it's for

The primary user groups are ecommerce/retail marketing teams, restaurant brands, and wellness brands, plus a distinct enterprise track for larger organizations with dedicated onboarding specialists and customer success managers on higher-tier plans. Vendor case studies span single and multi-brand DTC retailers through larger consolidated retail operations. Klaviyo also maintains separate developer and agency/tech-partner tracks, a secondary audience of implementation partners building on its APIs.

Why it stands out

On its official Mailchimp comparison page, Klaviyo states that over 35,000 brands have left Mailchimp for Klaviyo, positions itself as purpose-built for ecommerce/retail marketing, and claims its AI is native and proactive with access to a breadth of ecommerce data. Quantified differentiators stated on its own pages include Customer Agent resolving 65% of queries autonomously, benchmarking against 100 peer brands, and a 350+-integration App Marketplace spanning named platforms such as Shopify, WooCommerce, Magento, BigCommerce, and Wix.

Founding Year

2012

Target Industry

B2B, B2C, SMB, Enterprise, Ecommerce, Retail, Restaurants, Wellness, Direct-to-consumer, Fashion, Beauty, Footwear, Subscription commerce

Available Integrations

Shopify: flagship ecommerce integration with real-time bidirectional sync of profiles and orders; Klaviyo-side edits to synced custom properties get overwritten on the next sync.
Meta Ads: maps Klaviyo lists and segments to Meta Custom Audiences for retargeting and suppression, with a 24-48 hour propagation delay.
Google Ads: connects lists and segments to Google Ads audiences for lookalike and retargeting campaigns, with an up-to-48-hour population delay.
TikTok Audiences: syncs lists and segments into TikTok custom audiences with strict one-to-one mapping and one ad account per Klaviyo account.
Recharge: feeds subscription events into flows and campaigns via pre-built templates; requires an active Klaviyo-Shopify integration as a prerequisite.
Okendo: syncs reviews, loyalty, referrals, and survey data into Klaviyo as events and profile properties for segmentation and review-request flows.
Yotpo: surfaces top review snippets using sentiment analysis for use in campaigns and flows, connected with a Klaviyo API key on the Yotpo side.
Zendesk: syncs campaign and flow replies into Zendesk as tickets; OAuth reauthentication released April 23, 2025 is required for future improvements.
Square: connects Square Online and Point of Sale; online events sync in real time while in-store events sync every 30 minutes.
Anthropic: extends Klaviyo's Model Context Protocol server into Claude Chat and Claude Cowork for cross-channel query access and autonomous data pulls.

Klaviyo pricing centers on a Free tier plus five configurable paid modules: Marketing, Data + Analytics, Service, Composer, and Customer Agent, combined into a custom monthly total.

Free: $0/month with no time limit and no credit card required, covering up to 250 active profiles, 500 email sends per month, 150 SMS/MMS message credits per month, and 10,000 Composer AI credits per month. Full email support runs for the first 60 days only, after which access drops to Help Center, Klaviyo Academy, and Community.

Paid usage bills primarily on active profiles (any profile that can be emailed, regardless of consent status) plus emails sent in the cycle. The lowest paid Marketing tier starts at $20/month. Named sub-products scale by usage:

Customer Hub: $20/month for up to 10,000 active profiles.
Helpdesk: $10/month for up to 50 shopper-initiated tickets.
Customer Agent: $50/month for up to 75 conversations.
Marketing Analytics: $100/month for up to 13,500 active profiles.

Mobile messaging bills via credits that vary by country and channel: US SMS = 1 credit, US MMS = 3 credits, Canada SMS = 3 credits, Germany SMS = 12 credits, Australia SMS = 4 credits. Messages over 160 characters (70 with emoji) split into billed segments, failed deliveries still consume credits, and credits reset monthly with no rollover.

Overage handling offers three choices when a limit is hit: Flexible Overages, Auto-Upgrade, or None. Flexible Sending temporarily upgrades for a single billing cycle, available for email on all paid plans but for SMS only on plans priced at $495/month or higher. Enterprise-scale needs route to Professional Services and Enterprise sales listings.

Pricing last verified: 07/08/2026
Disclaimer: Pricing is subject to change. Please confirm current pricing on the vendor site.

Features & Specs

Channels: email, SMS, RCS for Business, mobile app push notifications, WhatsApp, and social marketing.
Free plan: $0/month, up to 250 active profiles, 500 email sends/month, 150 SMS/MMS credits/month, and 10,000 Composer AI credits/month.
Paid modules: Marketing, Data + Analytics, Service, Composer, and Customer Agent, mixed into a usage-based monthly total.
Customer Hub: branded self-service portal with order tracking and one-click buy again, from $20/month for up to 10,000 active profiles.
Helpdesk: ticket management with shared inbox and multiple agents, from $10/month for up to 50 shopper-initiated tickets.
Customer Agent: 24/7 AI customer service that resolves 65% of queries autonomously, from $50/month for up to 75 conversations.
Marketing Analytics: revenue attribution and benchmarking against 100 peer brands, from $100/month for up to 13,500 active profiles.
Integrations: 350+ pre-built apps via the Klaviyo App Marketplace.
API: REST API with date-based versioning, current version v2026-04-15.
Authentication: private API key, OAuth, or a 6-character public company-ID key for client-side calls.
Rate limiting: two-tier fixed-window scheme with burst and steady windows, returning HTTP 429 per endpoint when exceeded.

Security & Compliance

Klaviyo undergoes annual third-party audits and maintains controls in accordance with industry standards such as SOC 2 and ISO 27001, with audit reports downloadable via its self-service Trust Center at trust.klaviyo.com.

As a data processor, Klaviyo offers profile consent-management and rights-request tooling to help customers meet General Data Protection Regulation (GDPR) and California Consumer Privacy Act (CCPA) requirements, and lets its own account users submit privacy-rights requests.

Product security controls include multi-factor authentication (MFA), single sign-on (SSO), just-in-time (JIT) user provisioning, and role-based access controls. API access is secured via API keys or OAuth with least-privilege, feature-specific permission scopes.

Internally, Klaviyo uses a modern SSO platform for workforce identity management, endpoint mobile-device management and anti-malware tooling, disk encryption on endpoints, regular access reviews, an annual third-party penetration test, an ongoing external bug-bounty program, and an internal Offensive Security team performing targeted penetration testing.

Industry Use-Cases

Marc Fisher Footwear consolidates six brands

Six footwear brands, six duplicate sets of CRM work. Marc Fisher Footwear fixed that by migrating all six brands onto a single Klaviyo account, which centralized campaigns and customer data. Published case studies report a 20% time savings on CRM execution.

Thirdlove unifies email and SMS

Separate tools for email and SMS fragmented Thirdlove's messaging. Bringing both channels onto Klaviyo let the brand coordinate campaigns from a single profile view. The combined program returned 15x on SMS spend.

Dollar Shave Club reduces stack cost

A sprawling CRM stack carried heavy overhead for Dollar Shave Club. Consolidating it on Klaviyo trimmed tooling. Total cost of ownership dropped by more than 30%.

EZ Bombs grows through TikTok

Reaching new shoppers on social called for a tighter link between ads and CRM. EZ Bombs answered with Klaviyo's TikTok integration, syncing audiences and coordinating messaging across the two. Ecommerce revenue grew 27% year over year.

Half Magic builds repeat purchasers

For cosmetics brand Half Magic, the goal was turning first-time buyers into loyal ones. Email, SMS, and Customer Hub together gave shoppers self-service tools alongside targeted messaging. Repeat purchasers grew 5x.

Tatcha lifts promotional revenue

Seasonal promotions needed coordinated reach for Tatcha. Running New Year campaigns through both email and SMS on Klaviyo increased promotional revenue by 20%.

Pi Co. automates in-store and online

Bridging Square point-of-sale data with marketing was the challenge for Pi Co. The Klaviyo and Square integration fed order data into automated email and SMS flows. Those flows now drive 54% of revenue.

Tool's Alternatives

Omnisend is an ecommerce-focused email, SMS, and web-push automation platform with native integrations for Shopify, BigCommerce, WooCommerce, Wix, and WordPress, plus built-in AI for copywriting, send-time optimization, and segmentation and free tooling to migrate from Klaviyo. Its integration catalog of 200+ apps is materially smaller than Klaviyo's 350+, covering fewer niche ecommerce tools. It differentiates by positioning as a swap-in for the same Shopify-centric workflow rather than a differently-shaped product.

Attentive is an SMS and RCS-first omnichannel engagement platform built around Attentive Signal, its cross-channel identity-resolution layer, plus agentic AI products that generate personalized campaigns with minimal setup. Its deliverability and compliance tooling is purpose-built for high-volume peak-period SMS, and it serves large retail brands such as Crocs, UGG, and H&M. The product centers on SMS with email as a secondary channel, the inverse of Klaviyo's email-first architecture, so email-primary teams may find the workflow less natural. Its differentiator is single customer-ID orchestration across channels via Attentive Signal.

Mailchimp is a broad, Intuit-owned all-in-one marketing platform spanning email, SMS, forms, and automations, accessible to non-technical users across ecommerce, hospitality, nonprofits, and professional services. It offers a very low barrier to entry and 300+ integrations reaching well beyond ecommerce. SMS is an add-on available only in select countries, and its ecommerce automation is generally less specialized than Klaviyo's ecommerce-native data model. Its differentiator is the broadest cross-vertical applicability, including non-ecommerce SMBs.

Bloomreach Engagement is an enterprise customer engagement platform unifying customer data, its Loomi AI, and 13+ communication channels for large brands such as Red Bull, Pandora, and American Eagle. A Marketing Agent generates full email workflows from a plain-English prompt, and a Loomi Analytics agent lets marketers query data without IT support. Its enterprise certifications and complex data-integration focus signal it is not built for SMB or DTC brands the way Klaviyo is. Its differentiator is real-time, AI-driven behavior prediction baked into the core engine.

Iterable is an enterprise cross-channel engagement platform centered on an AI decisioning layer called Nova, serving large brands such as Fabletics, HelloFresh, and The Washington Post across retail, fintech, and media. It unifies behavioral, product, and engagement data into one context layer for real-time, non-linear journey orchestration without engineering dependency. Its enterprise-scale infrastructure makes it a heavier, more implementation-intensive alternative than Klaviyo for smaller merchants. Its differentiator is Nova's real-time decisioning plus built-in agent assistance for continuous optimization.

Frequently Asked Questions

How much does Klaviyo cost to start?

Klaviyo offers a Free plan at $0/month for up to 250 active profiles and 500 email sends monthly, while the lowest paid Marketing tier starts at $20/month.

What channels does Klaviyo support?

The platform sends across email, SMS, RCS for Business, mobile app push notifications, WhatsApp, and social marketing, all managed from unified customer profiles built in the Klaviyo Data Platform.

Does Klaviyo integrate with Shopify?

Yes. Shopify is Klaviyo's flagship integration with real-time bidirectional sync of profiles and orders, part of the 350+ pre-built apps in the Klaviyo App Marketplace.

Is there a free trial or demo?

Klaviyo provides an indefinite no-credit-card Free plan as its evaluation path, plus a sitewide "Get a demo" option that routes prospects to a sales-led product walkthrough.

What certifications does Klaviyo maintain?

Klaviyo maintains controls in accordance with SOC 2 and ISO 27001, undergoes annual third-party audits, and publishes downloadable reports via its Trust Center at trust.klaviyo.com.

How does Klaviyo bill for messages?

Paid plans bill on active profiles plus emails sent, while mobile messaging uses credits that vary by country: US SMS costs 1 credit and US MMS costs 3 credits.

When did Klaviyo go public?

Klaviyo priced its IPO at $30.00 per share on September 19, 2023 and began trading on the New York Stock Exchange under ticker KVYO on September 20, 2023.

What is Klaviyo's Customer Agent?

Customer Agent is a 24/7 AI-powered customer service tool that resolves 65% of queries autonomously, priced from $50/month for up to 75 conversations.

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Klaviyo

The autonomous B2C CRM