Klaviyo vs Mercantis: Which Is Better in 2026?

Klaviyo is a marketing and customer-data platform built for consumer brands — especially ecommerce — that unifies all your customer data and uses it to power highly personalized, automated marketing across email, SMS and more. Trusted by 205,000+ brands in 100 countries, it's become the go-to for online stores that want their marketing driven by real customer behavior.

What Klaviyo is

Klaviyo combines a customer data platform (CDP), marketing automation, analytics and, increasingly, AI agents and customer service into one system. It pulls every signal about your customers — purchases, browsing, engagement — into unified profiles, then uses that data to send the right message on the right channel automatically, whether that's an abandoned-cart email, a win-back SMS or a personalized recommendation.

Who it's for

Klaviyo serves relationship-driven B2C brands: ecommerce and retail businesses above all, but also gyms and wellness centers, restaurants, and enterprises. It's for companies whose growth depends on turning customer data into repeat purchases and loyalty — and who've outgrown a basic email tool that doesn't know what their customers actually do.

What it offers

• Customer Data Platform with unified profiles (7.3bn profiles managed)
• Omnichannel messaging: email, SMS, RCS, WhatsApp, push and social
• Real-time personalization and segmentation
• Composer AI agent that builds on-brand campaigns from prompts
• Customer Agent that resolves ~65% of inquiries autonomously
• Advanced analytics and benchmarking
• Customer Hub and Helpdesk for support
• 350+ integrations (Shopify, WooCommerce, Stripe) plus full API

Marketing powered by real data

Klaviyo's defining strength is its data foundation. Because it unifies every customer's behavior into a single profile — what they bought, browsed and clicked — the marketing it sends is grounded in what people actually do, not broad guesses. That means genuinely personalized, timely messages: a product someone viewed but didn't buy, a replenishment reminder timed to their purchase cycle. For ecommerce brands, that behavior-driven personalization is what turns marketing from spray-and-pray into real revenue.

Automation that runs itself

Klaviyo automates the flows that quietly drive ecommerce revenue — welcome series, abandoned carts, post-purchase follow-ups, win-backs — across email and SMS together, triggered by real customer actions. Its newer AI agents push this further: Composer can build on-brand campaigns from a natural-language prompt and audit your flows and segments, while a Customer Agent resolves around 65% of support questions on its own. That's marketing and service increasingly running autonomously in the background.

One platform instead of a fragmented stack

Klaviyo's bigger pitch is replacing a tangle of separate tools — email tool, SMS tool, CDP, analytics, helpdesk — with one unified system where they share the same customer data. That unification is powerful: your support team sees the same profile your marketing does, and your campaigns, service and analytics all draw on one source of truth. Processing billions of events and API calls daily, with a 99.95% uptime SLA and SOC 2 compliance, it's built to handle that at serious scale.

Learn from every brand's data

Beyond your own numbers, Klaviyo's scale gives it a rare advantage: benchmarking. Because it processes billions of events across 205,000+ brands, it can show you how your open rates, conversion and revenue compare to similar businesses in your industry, so you know whether a result is genuinely good or just average. That context turns raw analytics into actionable direction — you can see where you're underperforming peers and focus your effort there, rather than guessing what "good" looks like in isolation.

Why choose Klaviyo

For consumer and ecommerce brands that want marketing driven by real customer data, Klaviyo is a market-leading choice. Its unified CDP, omnichannel automation, deep personalization, AI agents for campaigns and support, and 350+ integrations (Shopify chief among them) make it a practical way to turn customer behavior into personalized, automated marketing that drives repeat purchases — replacing a fragmented stack with one data-rich platform.

Mercantis is an ecommerce and business management platform designed for small and medium-sized businesses, physical retailers, social sellers, entrepreneurs and growing brands across Latin America.

The platform helps businesses centralize their sales operations in one place. Merchants can create and manage an online store, organize their product catalog, categories and variants, control inventory and stock, process customer orders, configure payment methods, define shipping and delivery options, manage discounts and keep their day-to-day commercial activity organized.

Mercantis is particularly useful for businesses that already sell through channels such as WhatsApp, Instagram or a physical store but want a more structured system to manage products, customers, orders and inventory. Instead of relying on spreadsheets, manual messages and multiple disconnected tools, businesses can use Mercantis as a central platform for their commerce operations.

Artificial intelligence is integrated into the platform to reduce repetitive work and make catalog management faster. Businesses can use AI to help create products, generate and improve product names and descriptions, organize products into categories, optimize catalog information and accelerate catalog imports. This makes it easier for merchants with large inventories to digitize their business without manually entering every piece of information.

Mercantis also supports products with variants such as size, color or other attributes, stock management, pricing and promotional pricing, order management and multiple delivery configurations. Businesses can offer options such as store pickup, fixed-price shipping, free shipping, shipping based on purchase conditions or delivery arrangements coordinated directly with the customer.

The platform is built for businesses that operate both online and offline. Physical retailers can use Mercantis to keep their catalog, inventory and sales operations connected while also offering customers an online storefront where they can browse products and place orders.

Mercantis currently supports businesses across 16 Latin American markets, with support for different currencies and commerce requirements depending on the country. The product is focused specifically on the needs of Latin American merchants rather than being a generic global ecommerce solution.

Unlike ecommerce platforms that charge commissions on every sale, Mercantis does not charge transaction commissions. Businesses pay for the platform while keeping control of their own sales revenue.

Mercantis is designed to make ecommerce and business management accessible to companies that do not want to implement complicated enterprise software. A business can quickly create its store, upload or import its catalog, configure payments and shipping and start selling.

The goal of Mercantis is to give small and medium-sized businesses a simple but powerful commerce infrastructure that helps them organize their operations, reduce manual work, improve inventory control, sell through more channels and grow without adding unnecessary operational complexity.

What problem it solves

Mercantis helps small and medium-sized businesses manage online and in-person sales without relying on spreadsheets, disconnected tools or manual WhatsApp conversations. It centralizes product catalogs, inventory, variants, orders, payments, shipping and day-to-day business operations in one platform. It is especially useful for merchants selling through WhatsApp, Instagram or physical stores who need a simple way to organize their business, launch an online store and keep stock and orders under control. Built-in AI also reduces the time required to create products, write descriptions, categorize items and import existing catalogs.

Alternatives & competitors

Mercantis is an alternative to platforms such as Shopify, Tiendanube (Nuvemshop), Empretienda, WooCommerce and Wix. Unlike general-purpose ecommerce platforms, Mercantis is focused on Latin American small and medium-sized businesses and combines online store creation with inventory, order management, payments, shipping, point-of-sale operations and AI-assisted catalog management. It is designed to be simpler to set up and operate for businesses that already sell through WhatsApp, Instagram or physical stores.