For all the talk about TikTok trends, Instagram ads, and AI-powered chatbots, one marketing channel remains undefeated: email. It might not have the flashy appeal of social media or the viral potential of video content, but when it comes to engagement, retention, and actual revenue, email still dominates.
Why? Because the best marketing by email isn’t just about sending mass blasts anymore. It’s smarter, more personal, and deeply data-driven. The days of generic promotions cluttering inboxes are over—now, it’s all about predictive analytics, AI-generated recommendations, and automated customer journeys that feel like one-on-one conversations.
For B2C brands, email is more than just a communication tool; it’s a direct line to customers, packed with insights that drive sales and build loyalty. But not all email marketing platforms are built the same. If you want to send emails that actually get opened, read, and acted on, you need a platform that goes beyond the basics.
Enter Klaviyo, the marketing powerhouse designed specifically for B2C brands. It’s not just another email tool—it’s a customer data goldmine, an automation beast, and a revenue-driving machine all rolled into one.
What Is Klaviyo?
Klaviyo isn’t just another email marketing platform. It’s the only CRM built from the ground up for B2C brands, designed to turn customer data into powerful, personalized marketing.
Back in 2012, Andrew Bialecki and Ed Hallen saw a problem: consumer brands were sitting on mountains of customer data, but they had no real way to use it. There was no single tool that combined email marketing, automation, and deep customer insights—so they built one.
Fast forward to today, and Klaviyo powers over 167,000 brands worldwide, managing 7+ billion unique customer profiles. That’s not just impressive—it’s industry-defining.
Klaviyo does what other platforms can’t: it doesn’t just send emails; it learns from them. By tracking customer behavior, purchase history, and even how people interact with emails, Klaviyo helps brands predict what customers want before they even know it themselves.
Email Marketing in 2025
If you think email marketing is just about blasting promotions into inboxes and hoping for the best, think again. In 2025, email marketing is smarter, more personalized, and more powerful than ever. It’s not just a way to promote products—it’s a direct channel to build relationships, drive sales, and keep your brand top of mind.
At its core, email marketing is all about engagement. Whether it’s welcoming new subscribers, sending exclusive offers, or reminding someone they left something in their cart, emails are the bridge between brands and customers. And unlike social media, where your content is at the mercy of an ever-changing algorithm, emails go straight to your customer’s inbox—no middleman, no pay-to-play visibility issues.
The best email marketing strategies focus on two things: timing and relevance. There are two primary ways brands send emails:
- Planned campaigns: These are your carefully crafted, scheduled emails—like a seasonal sale announcement or a monthly newsletter packed with updates and content.
- Triggered emails: These are the game-changers. Triggered emails—like abandoned cart reminders, post-purchase follow-ups, or birthday discounts—are sent automatically when a customer takes (or doesn’t take) a certain action. These are the ones that feel less like marketing and more like helpful nudges.
From welcome emails that set the tone to transactional emails confirming orders and shipping updates, every message serves a purpose. And then there are re-engagement emails—those friendly “Hey, we miss you” messages that try to bring inactive subscribers back into the fold. The best brands don’t just send emails; they create conversations that keep customers coming back.
Why Email Marketing Still Reigns Supreme
For years, digital marketers have debated the effectiveness of email marketing compared to newer, shinier channels. But the numbers don’t lie: email is still one of the highest ROI-generating marketing channels out there.
According to Klaviyo’s marketing mix report, 78.68% of businesses rank email in their top three highest-performing channels. Why? Because email marketing is:
- Unmatched for brand awareness: Unlike social media, where your posts can get buried, email lets you speak directly to your customers—no fighting against an algorithm, no hoping for engagement. If your email lands in their inbox, it’s there until they open it (or delete it, but let’s be optimistic).
- A personalization powerhouse: With tools like Klaviyo, brands can send hyper-targeted emails based on customer behavior, purchase history, and preferences. Think about the last time you got a “You might also like…” email that actually felt relevant—that’s personalization done right.
- A higher ROI machine: Unlike paid ads that require constant spending, email marketing keeps working once you build your subscriber list. Personalized emails convert better than generic ads because subscribers have already opted in—they actually want to hear from you.
- Data-driven and measurable: The beauty of email marketing is that every campaign is trackable. You can see who opened your email, who clicked, and who ignored it—then tweak your strategy based on what works. Metrics like open rate, click-through rate, and unsubscribe rate give you real-time feedback on what your audience wants.
Klaviyo Email Marketing
Email marketing has come a long way from the days of one-size-fits-all campaigns. Today, it’s all about precision, personalization, and automation—and that’s exactly where Klaviyo stands out. With built-in AI, deep customer insights, and a robust automation engine, Klaviyo helps brands move beyond basic email blasts and into a world where every message is timely, relevant, and designed to convert.
One of Klaviyo’s biggest strengths is its data-driven approach to segmentation. Rather than sending the same email to an entire list, brands can use Klaviyo’s AI to automatically generate audience segments based on browsing history, past purchases, engagement levels, and even predicted behaviors. The platform doesn’t just react to what customers have done—it anticipates what they might do next, making it easier to send the right offer to the right person at the right time.
The personalization extends to product recommendations, which dynamically update based on each customer’s preferences. Instead of generic promotions, emails feel curated—more like a well-timed nudge from a helpful store associate than a mass marketing effort. For brands looking to refine their approach, A/B testing tools allow them to experiment with subject lines, content, and design variations to see what drives the most engagement.
Klaviyo also helps brands stay ahead of customer churn. The AI-powered platform can predict when a customer is likely to drop off and trigger re-engagement campaigns before they lose interest. It’s not just about tracking clicks and open rates; Klaviyo provides real-time analytics that give brands a clearer picture of their audience’s behavior and even benchmarks their performance against competitors.
For brands that want to extend their marketing beyond email, Klaviyo seamlessly integrates with SMS campaigns—an approach that has been linked to an average 19% increase in GMV growth. With its ability to unify marketing, customer data, and automation in one platform, Klaviyo makes a compelling case as one of the best tools for brands looking to elevate their email marketing strategy.
Customizable Email Templates
Designing a great email shouldn’t feel like a full-time job. With Klaviyo’s email builder, brands get a user-friendly, flexible way to create emails that look polished and professional—without needing advanced design skills. The platform’s intuitive template editor balances ease of use with customization, making it easy to build emails that match your brand’s identity while ensuring consistency across campaigns.
One of the standout features is show/hide logic, which allows different customer segments to see content tailored to them within the same email. A first-time shopper might see an exclusive welcome discount, while a returning customer gets recommendations based on their previous purchases—all from the same campaign.
To streamline workflows, Klaviyo also offers reusable sections, so key elements like headers, footers, or promotional banners stay consistent across multiple emails. Instead of updating the same details over and over, brands can make a change once, and it updates everywhere.
Ensuring that emails look sharp across all devices is another major priority, and Klaviyo’s mobile-optimized templates handle that seamlessly. Whether an email is opened on a desktop, tablet, or phone, the layout automatically adjusts to maintain readability and engagement.
For brands that want more design flexibility, custom HTML and CSS support allows complete control over templates. Whether importing an existing design or coding something from scratch, the platform offers a way to customize emails without losing access to Klaviyo’s automation and personalization tools. The result is a streamlined way to create emails that don’t just look good but also serve a strategic purpose.
Smart Segmentation That Actually Works
Mass email blasts aren’t just outdated—they’re ineffective. Today’s email marketing is all about targeting the right people with the right message at the right time, and that’s where Klaviyo’s segmentation capabilities come into play.
The platform pulls in real-time and historical data from over 350 integrations, allowing brands to create focused audience segments based on behavior, engagement, and purchase history. That means emails aren’t just personalized with a first name—they’re shaped around what each customer is actually interested in. A frequent buyer might receive early access to a sale, while someone who abandoned their cart gets a gentle nudge with a reminder and a discount.
Timing matters just as much as content, and Klaviyo’s AI-powered send time optimization analyzes user behavior to determine when subscribers are most likely to open and engage. Instead of guessing, brands can rely on data to schedule emails at the most effective moment.
One challenge with email marketing is avoiding over-communication, and Klaviyo helps with that too. If a subscriber has already received multiple emails in a short time, the platform can automatically pause non-essential messages to prevent inbox fatigue. At the same time, priority emails—like order updates or time-sensitive promotions—are still delivered as planned.
The result isn’t just better engagement but a smarter, more efficient way to approach email marketing. Instead of hoping for clicks, brands can use data-driven insights to create more relevant, timely, and effective campaigns that actually connect with their audience.
Automated Flows
Klaviyo offers 60+ built-in automation flows, covering everything from welcome emails and abandoned cart reminders to price-drop alerts and post-purchase follow-ups. These ready-made workflows help brands get up and running fast, but the real power comes in customization. Whether starting from scratch or tweaking an existing flow, the platform allows complete control over how, when, and to whom emails are sent.
The real magic happens when flows are split into distinct paths based on customer behavior. A browse abandonment email can look different for someone who frequently checks out a product versus someone who just viewed it once. A cart reminder can adjust based on whether the abandoned order is high-value or a smaller purchase. Even discount offers can be tailored—customers with a higher predicted lifetime value (CLV) might receive exclusive perks, while others get a more general promotion.
Flows also go beyond conversions. Brands can automate thank-you messages, adjusting tone and content based on whether someone is a first-time buyer or a long-time customer. Upsell and cross-sell emails can be tailored based on purchase frequency, introducing products that complement past orders rather than sending random recommendations.
With Klaviyo, automation isn’t just about efficiency—it’s about creating a more personalized, engaging customer journey. And since the platform integrates real-time customer data, brands can continuously refine their flows, making adjustments as behaviors change.
The possibilities are nearly endless. If a brand can think of a scenario where an email could improve engagement, drive sales, or strengthen customer relationships, chances are, it can be built in Klaviyo—no manual follow-ups required.
Klaviyo B2C CRM
Klaviyo isn’t just an email marketing tool—it’s a fully integrated B2C CRM that brings marketing, service, and analytics together under one roof. Instead of juggling multiple platforms, brands can manage email, SMS, push notifications, and even customer support in one seamless system, powered by real-time data and AI-driven insights.
With Klaviyo Marketing, brands can create omnichannel campaigns that connect email, SMS, and mobile push notifications, ensuring customers receive personalized experiences wherever they interact. The Klaviyo Data Platform takes this further by enabling deep segmentation and hyper-personalization, making every message more relevant.
On the service side, Klaviyo Service makes it easy for customers to track orders, start returns, or connect with an agent—all from a single dashboard. AI-powered pre-sales agents even assist shoppers in real-time, answering product questions and guiding them toward a purchase like an in-store salesperson would.
With Klaviyo Analytics, brands get a clear, data-driven view of performance through customizable reports and dashboards. Features like RFM analysis, funnel tracking, and purchase insights help refine marketing strategies, ensuring messages reach the right people at the right time. AI-powered predictions take it even further, forecasting churn risk, order frequency, and spending habits to optimize engagement and retention.
By combining marketing, service, and analytics in one intelligent platform, Klaviyo enables brands to streamline operations, personalize at scale, and drive smarter business decisions—all without the usual complexity.
Final Thoughts
Email marketing has evolved far beyond simple newsletters and promotional blasts. In 2025, it’s about precision, personalization, and automation—and few platforms do it better than Klaviyo. For B2C brands looking to turn marketing by email into a real revenue driver, Klaviyo isn’t just a tool; it’s an entire ecosystem designed to engage customers intelligently and efficiently.
What makes it stand out is its ability to merge marketing, service, and analytics into one seamless experience. From AI-powered segmentation to real-time automated flows, Klaviyo ensures that every message is relevant, every campaign is data-driven, and every customer interaction adds value. Whether it’s hyper-targeted email campaigns, predictive customer insights, or a fully integrated CRM, Klaviyo provides brands with a smarter way to connect, convert, and retain customers.
Is it the best email marketing platform for B2C brands? Based on its powerful automation, deep customer insights, and omnichannel capabilities, it’s hard to argue otherwise. For brands serious about email marketing that actually works, Klaviyo is a top-tier choice that delivers results.
This article is sponsored by Klaviyo. All opinions are solely those of Expert Consumers. Expert Consumers delivers news and reviews on consumer products and services and may earn commissions from purchases made through featured links.
