Klaviyo

Klaviyo is a B2C marketing CRM that puts email and SMS marketing on top of a shared customer database. It syncs customer, product, and order data in real time, so the messages you send can reflect what a shopper has browsed, bought, or left in their cart. Ecommerce brands use it for both one-off campaigns and automated lifecycle sequences such as welcome series, abandoned cart reminders, and post-purchase follow-ups.

Setup starts by connecting a store. Shopify has a native integration, and Klaviyo lists connectors for other ecommerce platforms, CRMs, payment providers, and analytics tools; a standard library of integrations is included on the free plan. Once data is flowing in, you build segments from customer attributes and behavior, design messages from templates, and set up automations triggered by events like a first purchase or a lapsed customer. Analytics report on how campaigns and automations perform.

Messaging isn't limited to email. Klaviyo supports mobile messaging that can include SMS and WhatsApp, so brands can reach customers beyond the inbox with the same synced customer data driving personalization across channels.

Pricing follows a freemium model. There is a free plan, and paid plans scale with contact count and channel usage, so costs grow with your list size and sending volume. Enterprise pricing is available for large organizations. Exact figures weren't shown in the material reviewed here, so check Klaviyo's pricing page for current numbers.

Best for:

• Ecommerce stores, especially on Shopify, that want email and SMS managed in one platform
• Brands running lifecycle automations: welcome flows, abandoned cart, win-back, and post-purchase sequences
• Teams that segment audiences by purchase history and on-site behavior
• B2C businesses sending recurring campaigns and newsletters to a growing contact list
• Companies that want WhatsApp and SMS alongside email under a single customer profile
• Larger organizations that need enterprise-level pricing arrangements

Frequently asked questions

Does Klaviyo have a free plan?

Yes. The site shows a free plan, and it includes a standard library of integrations. Paid plans add capacity as your contact count and channel usage grow.

How much does Klaviyo cost?

Paid pricing scales with the number of contacts and the amount of channel usage, and enterprise pricing is available for large organizations. Exact prices weren't listed in the material reviewed, so check the pricing page for current rates.

Does Klaviyo support SMS and WhatsApp?

Yes. Mobile messaging can include SMS and WhatsApp in addition to email, all driven by the same synced customer data.

Does Klaviyo integrate with Shopify?

Yes, Shopify has a native integration. Klaviyo also lists connectors for other ecommerce platforms, CRMs, payment providers, and analytics tools.

Is there a Klaviyo mobile app?

The site presents Klaviyo as a web app. No native iOS or Android apps appeared in the material reviewed.

Is Klaviyo open source?

No. Nothing in the site content reviewed indicates an open-source offering, and no offline mode was mentioned either.

Alternatives

• Mails.ai — if you want AI-driven email campaign automation without an ecommerce data layer.
• GirikSMS — if SMS, WhatsApp, and web chat engagement matter more than a full email platform.
• CuratedLetters — if newsletters are your main output and you want to send without email limits.
• SMTP Ghost — if you're running personalized cold outreach rather than marketing to existing customers.