Klaviyo Shopify: Complete Email Marketing Integration Guide

Why Klaviyo is the Best Email Choice for Shopify

When we sold Superbon to SPRiNG in 2022, one of the elements that most impressed buyers was our email engine. Not our product catalog, not our design, but our Klaviyo setup that generated 32% of our monthly revenue. A figure that may seem optimistic but simply reflects the reality of a well-executed email strategy.

Email marketing remains the #1 conversion channel for e-commerce in 2025, with an average ROI of 36:1 according to the latest industry studies. For every euro invested in Klaviyo, well-optimized e-commerce brands recover an average of 36 euros. It's mathematical, measurable, and most importantly: it's a channel you own, unlike Meta or Google audiences.

Why Klaviyo specifically for Shopify? Because the native integration is so advanced that it transforms your Shopify database into a real behavioral goldmine. Where Mailchimp gives you access to emails and first names, Klaviyo automatically synchronizes complete purchase history, browsing behavior, viewed products, abandoned carts, Customer Lifetime Value, and even custom metafields you've created. Everything you need to know about Klaviyo lies in this unique ability to transform Shopify data into personalized, converting emails.

Compared to Omnisend or ActiveCampaign, Klaviyo largely dominates the Shopify ecosystem for a simple reason: the tool was designed from the outset for e-commerce, not adapted afterward. On Cabania, where we generate over €100k in monthly revenue, Klaviyo accounts for between 28% and 35% of turnover depending on the month. If you're launching your Shopify store, integrating Klaviyo from day one isn't a luxury, it's a strategic foundation. 

Klaviyo × Shopify Integration: Complete Setup

Native Installation in 5 Minutes

The beauty of Klaviyo-Shopify integration is its initial simplicity. From the Shopify App Store, you install the application with one click, authorize synchronization permissions, and in less than 5 minutes your Klaviyo account begins ingesting all your store's data. No developer needed, no complex configuration for the basic setup.

But beware: "installing" is not "optimizing." Discover our detailed integration guide to understand the subtleties that make the difference between a basic setup and an email war machine.

Customer Data Synchronization

This is where Klaviyo truly shines. From installation, your tool automatically synchronizes the complete purchase history of each customer: who bought what, when, for what amount, how many times. But most importantly, Klaviyo tracks the browsing behavior of your visitors in real time.

A visitor views three products in your "face care" category without adding anything to the cart? Klaviyo knows this and can trigger a browse abandonment email 24 hours later with exactly those three products. A customer adds a product to the cart but abandons the checkout? The "added to cart" event is captured instantly, allowing for a first automatic re-engagement email in less than an hour.

Custom properties are also synchronized: automatically calculated Customer Lifetime Value, Shopify tags you've created (VIP, Wholesaler, Influencer), and even metafields if you've configured them. On Cabania, we use metafields to track the configuration preferences of cabin beds, which allows us to send highly personalized emails about accessories compatible with the exact configuration ordered.

Advanced Tracking Configuration

"Active on Site" tracking in Klaviyo is a game-changer that is often underutilized. Once activated, it allows you to capture browsing behavior even for unidentified visitors (via cookies), and then reconcile this data as soon as they register or place an order. Result: you can send a welcome email that mentions the three products the person viewed even before signing up.

The "Back in Stock" alerts also deserve special attention. For our brands, this flow consistently generates conversion rates between 15% and 30%, well above the email average. Configuration is done product by product in Klaviyo, with an automatic signup form that appears when a product is out of stock.

For cart abandonment, Shopify already sends a native email if you enable it in the settings, but Klaviyo tracking is much more powerful: it allows you to create multi-email sequences with dynamic personalization, A/B testing, and fine segmentation based on cart amount or concerned products.

Essential Initial Settings

Double opt-in or single opt-in? In France, the question is sensitive due to GDPR. At Stellar Projects, we systematically recommend double opt-in for two reasons: guaranteed legal compliance, and superior list quality. Yes, you lose 20% to 30% of sign-ups between the first click and email confirmation, but the contacts who confirm are genuinely engaged, and your deliverability remains excellent.

Basic segmentation should be implemented from day one. At a minimum: separate newsletter subscribers from purchasing customers, and create segments by language if you operate in multiple languages. When migrating to Shopify, it's also the ideal time to properly restructure your Klaviyo database and start on a solid foundation.

The 7 Indispensable Email Automations

1. Welcome Series: The First 3 Emails That Set the Foundation

The welcome series is your first impression, and it consistently generates the best open rates in your email program: expect 50-60% open rate on the first email, sometimes even 70% if your lead magnet is powerful.

The classic 3-email architecture works remarkably well. Email 1 sent immediately after registration: warm welcome, quick brand introduction, and a 10% discount code to convert interest into a first order. At Superbon, this first email alone generated 8% direct conversion.

Email 2 arrives 2-3 days later: here you tell your story, why you created the brand, what differentiates you, and you present your bestsellers with social proof (customer reviews, number of sales). This is your storytelling moment, where you create an emotional connection.

Email 3 at D+5 or D+7: creating urgency and a final push. The promo code expires in 48 hours, your customers love such a product (reinforced social proof), and you offer a user guide or tips to get started. This is your last opportunity to convert before the prospect becomes "cold."

2. Abandoned Cart: Recovering 15-25% of Lost Revenue

Abandoned cart is the most profitable flow of any Klaviyo program, period. For our brands, it accounts for between 12% and 18% of total email revenue. Timing is critical: first email 1 hour after abandonment (gentle reminder, "you forgot something"), second email at 24 hours (adding urgency, "products are selling fast"), third at 48 hours (incentive if necessary, or reinforced social proof).

A fourth email at 72 hours is optional depending on your industry. At Cabania, where the average cart is over €800, we use it systematically because the decision cycle is longer. At Superbon with an average cart of €45, three emails are more than enough.

The progressive incentive technique works well: no discount in the first two emails (many people return naturally), then -10% in the third only if the cart exceeds a certain amount. This prevents conditioning your customers to always wait for a promotion.

Personalize as much as possible: show exact images of abandoned products, use first names, mention if stock is limited (real urgency, not artificial), and add customer reviews specific to these products. A generic "come back to complete your order" template converts 2-3 times less than a truly personalized email.

3. Post-Purchase and Upsell: Maximizing Lifetime Value

The first post-purchase email goes out immediately after the order: warm thank you, order summary, and tracking link. Nothing revolutionary, but it's a moment of positive emotion not to be overlooked. Typical open rate: 60-70%.

The intelligent cross-sell email arrives 7 days after receipt (allow time for the customer to receive and test the product). Klaviyo excels here: you can use AI recommendation blocks that automatically suggest complementary products purchased by other customers who ordered the same item. At Superbon, our facial serum consistently triggered a recommendation for the moisturizing cream with a 12% conversion rate on that email.

The customer review request at D+14 is crucial for your social proof and SEO. Integrate Yotpo or Judge.me with Klaviyo, and the flow automatically triggers with a direct link to the review form. Offering a small incentive (50 loyalty points, entry into a raffle) significantly boosts the response rate.

The repeat purchase email at D+30-45 (to be adjusted according to your product consumption cycle) intelligently re-engages: "it's time to renew your serum," with automatic calculation based on product capacity and average usage. Add a subscription option (via ReCharge) to turn one-time purchases into recurring revenue.

4. Browse Abandonment: Capturing Intent Before Cart

Browse abandonment is the often-overlooked flow that can generate 3-5% additional revenue. The trigger: a visitor views 2 or more products without adding anything to the cart. The email goes out 24 hours after the visit (not too early to avoid being intrusive, not too late for interest to still be there).

Personalization is essential: show exactly the products viewed with their images, prices, and some customer reviews. Add 2-3 similar or complementary products to broaden interest. On Cabania, this flow converts at an average of 2.5%, representing about €3000 in monthly revenue for an automatic email running in the background.

5. Back in Stock: The Flow with Exceptional Conversion Rates

If there's one flow that deserves your priority attention after abandoned cart, it's Back in Stock. Why? Because a customer who signs up to be notified of a restock demonstrates very strong purchase intent. They've already made the effort to leave their email specifically for this product.

Result: conversion rates between 15% and 30% depending on the sector, where a classic email converts at 1-2%. At Superbon, our best-seller, out of stock for 3 weeks, generated 847 Back in Stock sign-ups. When we restocked, the automatic flow converted 223 orders in 48 hours. Instant and massive ROI.

Configuration in Klaviyo is simple: create a flow with a "Subscribed to Back in Stock" trigger, wait for the product to be available again (the condition is automatically checked via Shopify sync), and immediately send the notification. Add a sense of real urgency: "Only 50 units available" if that's truly the case.

6. Inactive Customer Reactivation: Win-Back Campaigns

Segmentation by inactivity duration is the foundation of reactivation campaigns. Create three segments: inactive for 60 days, 90 days, and 180 days. For each segment, the approach and incentive are adjusted.

At 60 days, a simple reminder is often enough: "it's been a while," show new products, mention that you're thinking of them. No discount needed. At 90 days, add a light incentive (-10% or free shipping). At 180 days, bring out the heavy artillery: -20%, exclusive offer, or special bundle. At this stage, you're not recovering margin, you're recovering the customer.

On Cabania, our "inactive 180d+" segment paradoxically represents a real goldmine: these are former buyers who have already spent an average of €850 (high average basket). Reactivating just 5% per quarter represents €15k to €20k in additional turnover with a simple, well-designed email.

7. Customer Winback VIP: Special Treatment High Value

Not all customers are equal, and your VIPs deserve differentiated treatment. Create a "High Value Customers" segment based on CLV (Customer Lifetime Value): for example, all those who have spent more than €500 in the last 12 months.

For this segment, offers are exclusive and personalized: early access to new products, VIP discounts not communicated to the rest of the database, invitations to private events or webinars, direct line with the founder. At Stellar Projects, we apply this principle to our own clients: those who have generated more than €50k in projects benefit from a priority hotline and free strategic advice.

Integration with a loyalty program (Smile.io, LoyaltyLion) in Klaviyo allows the customer's point balance to be automatically displayed in each email, creating a constant reminder of accumulated value and encouraging spending. Strategies to increase your sales with email marketing all go through this intelligent personalization based on customer value. 

Advanced Segmentation: Maximizing Relevance

The RFM Method: Recency, Frequency, Monetary

RFM segmentation is the holy grail of e-commerce email personalization. It crosses three dimensions: when the customer last purchased (Recency), how many times they purchased (Frequency), and how much they spent (Monetary). This creates ultra-precise behavioral segments that allow for fine-tuning messages and offers.

Your "Champions" are customers who have purchased recently, purchase often, and spend a lot. This is your VIP segment that should receive exclusive offers, not generic promotions that would devalue their status. At Superbon, this segment represented only 8% of the database but 34% of email revenue.

"Loyal" customers buy frequently with decent amounts but haven't placed an order recently. Warning: this segment is at risk of churn. Reactivate them with a personal message, an emotional reminder of why they liked your products, and a targeted offer if necessary.

"At-risk" customers haven't purchased for X days (to be defined according to your typical product cycle). For Superbon, with cosmetics lasting 2-3 months, "at-risk" meant 90 days of inactivity. For Cabania, where a cabin bed is a unique purchase, it's more like 180 days without interaction (email open, site visit).

"Lost" customers exceed 180 days of total inactivity. Before definitively excluding them (sunset policy), attempt one last aggressive win-back campaign. If no reaction, delete them: they drag down your open rates, degrade your sender reputation, and cost you money (Klaviyo bills by contact count).

Behavioral and Predictive Segments

Beyond RFM, segment by product category purchased. A customer who only bought face care from Superbon received different emails from a customer focused on body or hair. This seems obvious, but many brands still send the same email to their entire database.

The acquisition source (Meta, Google, organic, affiliate) also influences behavior and expectations. Customers from Meta generally respond better to impactful visuals and short offers, while those from Google search are more receptive to educational content and product comparisons.

The device (mobile vs. desktop) radically changes how your emails are consumed. 70% of opens are on mobile today, but desktop conversions are often higher (higher average basket, smoother checkout process on large screens). Adapt your templates accordingly: on mobile, one very visible CTA; on desktop, you can allow for more richness.

Klaviyo's predictive segments use machine learning to estimate each customer's "Predicted Next Order Date." At Cabania, we use this data to trigger cross-sell accessory emails exactly when the algorithm predicts the customer is ready to repurchase. Open rate: 42%, click-through rate: 8.3%, well above our campaign averages.

A concrete example from our cosmetic experience at Superbon: we had segmented our database into 3 main profiles (Minimalist Routine, Skincare Addict, Curious Discoverer) based on the number of products purchased and the diversity of categories explored. Each profile received a different email calendar and product recommendations. Result: +18% repeat purchase rate over 6 months compared to the previous one-size-fits-all approach.

Design and Content: Converting Templates

2025 Email Design Principles

Email design has evolved tremendously in recent years, and 2025 continues to emphasize certain trends. Mobile-first is no longer an option but a requirement: 70% of opens are on smartphones, and an email not optimized for mobile is immediately deleted.

The visual hierarchy must be crystal clear: logo at the top, clear and impactful headline, dominant product visual, highly visible CTA above the fold. On mobile, the user doesn't always scroll, so the essentials must be immediately visible. Test your templates on iPhone and Android; renderings sometimes vary significantly.

CTAs deserve special attention. A button that's too small on mobile is frustrating; a button that's too large seems aggressive. Our sweet spot at Stellar Projects: 44-48px minimum height on mobile, contrasting color with the background, action-oriented text ("Discover" rather than "Click here"). Systematically A/B test the color: at Superbon, a powdery pink CTA converted 23% better than a black CTA, dictated by brand identity consistency.

Dynamic Personalization and Smart Blocks

Klaviyo's dynamic blocks allow different content to be displayed depending on the recipient's segment, all within the same email. Example: your abandoned cart email can show a 10% promo code only to new customers, while returning customers see a reassurance message without a discount.

Klaviyo's AI product recommendations analyze the purchase history of all your customers to automatically suggest the most relevant products to each individual. At Cabania, this block added to our post-purchase emails generated an additional €4200 in monthly revenue with zero manual effort. The algorithm continuously learns and improves over time.

Countdown timers create powerful visual urgency. Be careful not to overuse them: if all your emails contain a timer, the effect wears off. Reserve them for real-time-limited promotions and abandoned carts where urgency is justified (limited stock, genuinely expiring offer).

Copywriting and Systematic A/B Testing

The subject line remains the most critical element of your email: if it doesn't encourage opening, everything else is useless. Aim for less than 50 characters (optimal mobile display), use emoji sparingly (one maximum), personalize with the first name if relevant but not systematically (the effect wears off).

At Superbon, our most effective subject lines combined concrete benefit and curiosity: "Marine, your skin will love this serum" (38% open rate) versus "New anti-aging serum available" (22% open rate). First name + emotional benefit crushed the basic product description.

The preheader (that small line of text that appears after the subject line) is often overlooked, even though it strongly influences the decision to open. Never leave it as default ("View this email in your browser"); use it to complement the subject line and provide an additional reason to open.

In the body of the email, storytelling always beats purely promotional content. Tell why you created this product, share an authentic customer testimonial, explain the problem you solve. In our Cabania emails, the best performance comes from stories of parents who testify to the impact of the cabin bed on their child's sleep, not from lists of technical features.

A/B testing should be systematic, not occasional. Test one element at a time: subject line one week, CTA the next, send time the third week. The minimum sample size for a significant test: at least 1000 recipients per variation, ideally 2000+. Below that, results are too influenced by statistical chance. Optimizing your Shopify conversion rate necessarily involves this culture of continuous testing.

Integrations and Shopify-Klaviyo Ecosystem

Advanced Synchronization with Shopify

The native Shopify-Klaviyo integration automatically synchronizes tags and segments, but few brands fully leverage this connection. Shopify tags you create (VIP, Wholesale, Influencer, Press) instantly appear in Klaviyo and can trigger specific flows or campaign exclusions.

Custom properties are even more powerful: create properties in Shopify (number of orders, lifetime amount, favorite category) and use them in Klaviyo to create ultra-precise segments. At Cabania, we have a "configuration_type" property that allows us to send perfectly adapted cross-sell emails for each type of bed ordered.

Shopify metafields can also be synchronized in Klaviyo if you correctly configure the integration. This is particularly useful for brands with complex catalogs or specific product attributes. Shopify Plus features like Shopify Flow even allow you to automate certain actions between Shopify and Klaviyo without using Zapier.

Powerful Third-Party Integrations

Review apps (Yotpo, Judge.me, Loox) integrate natively with Klaviyo to automatically inject customer reviews into your emails. Result: your abandoned carts display notes and comments specific to the products concerned, creating highly relevant social proof that boosts conversion by 15% to 25% according to our tests.

Loyalty programs (Smile.io, LoyaltyLion, Yotpo Loyalty) synchronize each customer's point balance in Klaviyo, allowing dynamic display of "You have 250 points = €12.50 to spend" in each email. This constant visibility of accumulated value strongly encourages repeat purchases.

Subscription apps (ReCharge, Appstle, Skio) allow you to segment your subscribers in Klaviyo and send them specific emails (reminder before debit, suggestion to pause subscription rather than cancel, upsell to a higher plan). For the subscription brands we support, these flows increase retention by 8 to 12 percentage points.

Product recommendation quizzes (Octane AI, Jebbit) capture valuable "zero-party data" (data voluntarily provided by the customer) and push it into Klaviyo. You now know that Marine has sensitive combination skin, is looking for vegan products, and has an average budget of €30 per product. This wealth of information allows for advanced personalization far beyond simple purchase data.

Webhooks and Custom Developments

For brands with very specific needs, Klaviyo webhooks and the API allow for custom integrations. At Stellar Projects, we have developed several custom connectors for our clients: synchronization with an external ERP, connection to a B2B CRM, integration with a physical point-of-sale system.

Advanced use cases often require specific development: for example, sending an automatic Klaviyo email when a sales representative qualifies a lead in the CRM, or triggering a notification when a key account customer places an order on the website. These cross-system automations create a fluid experience and drastically reduce manual work.

Analytics and Optimization: Measuring ROI

Essential Metrics and Benchmarks

The average open rate for e-commerce hovers around 35-45% in 2025. Below 30%, you likely have a deliverability problem or unengaging subject lines. Above 50%, congratulations, you are among the top 10% of e-commerce brands on Klaviyo. Our average on Cabania: 42%, with peaks at 65% on certain flows like Back in Stock.

The click-through rate is generally between 2% and 5%. What truly matters is the CTOR (Click-To-Open Rate): among those who opened, how many clicked? A good CTOR exceeds 12-15%. If your CTOR is low despite good open rates, your problem is in the email content, not the subject line.

The email conversion rate (orders / emails sent) varies enormously depending on the campaign type and sector, but a reasonable benchmark is between 0.5% and 2%. Flows perform better than campaigns: at Superbon, our abandoned carts converted at 3.8% while our product newsletters were around 1.2%.

Revenue per recipient (revenue generated / number of recipients) is perhaps the most actionable metric. If your RPR drops, either your audiences are fatigued (you're sending too much), or your merchandising is weak (unattractive products), or your offers lack punch. Track this KPI monthly and dig in whenever it falters.

Attribution and Data Reconciliation

Email attribution is a complex subject that causes heated debates. Klaviyo defaults to "last-click 5-day" attribution: if a customer clicks on an email and then purchases within 5 days, Klaviyo attributes the sale to itself. Google Analytics uses a different attribution. Result: sometimes significant discrepancies between the two tools.

Our approach at Stellar Projects: consider that the truth lies between the two figures. Klaviyo slightly overestimates (it attributes sales that would have happened anyway), GA4 underestimates (it doesn't always see the email click in attribution). If Klaviyo says 35% of your turnover and GA4 says 22%, the reality is probably around 28-30%.

Multi-touch attribution is fairer but more complex. It distributes credit for the sale across all touchpoints in the customer journey: they discovered your brand via Meta, clicked on a product email 3 days later, then searched for your brand on Google before converting. Who deserves the credit? All three touchpoints played a role. Klaviyo offers linear or position-based attribution models (first touch, last touch) to explore in advanced analytics.

Continuous Optimization and Audits

A quarterly audit of your flows is essential. Too many brands configure their automations once and then forget about them for months. Yet performance evolves, customer behavior changes, and what worked in January may be suboptimal in June.

During the audit, check: open and click rates for each email in the flow (often the 3rd email in a series performs very poorly and should be removed), overall conversion rate, monthly revenue generated. Compare to your previous benchmarks and Klaviyo industry standards. If a flow underperforms, test new subject lines, new timing, or different content.

The sunset policy involves regularly excluding inactive contacts who never open your emails. This is counter-intuitive (voluntarily reducing your database?), but essential for maintaining good deliverability. ESPs (Gmail, Outlook) observe engagement on your emails, and if 40% of your recipients never open anything, you lose reputation and end up in spam. At Stellar Projects, we recommend excluding contacts with no opens for 180 days, after a final win-back attempt.

Your testing roadmap should be planned quarterly: January you test subject lines, February CTAs, March send times, April email design, etc. This systematic approach ensures continuous improvement of your email performance.

Klaviyo Costs and ROI

Pricing and Price Structure

Klaviyo offers a free plan for up to 250 contacts and 500 monthly email sends, allowing you to test the tool risk-free when starting out. Beyond that, pricing is based on the number of active contacts (those who have opened or clicked an email in the last 6 months).

Concrete pricing example: for 1000 active contacts, expect about €45/month. For 5000 contacts: €150/month. For 10,000 contacts: €275/month. Note that inactive contacts (who never engage) are not charged, hence the importance of the sunset policy mentioned above.

SMS is billed additionally: approximately €0.015 per SMS in France, or €15 for 1000 SMS sent. For our brands, we use SMS sparingly (VIP abandoned carts, flash alerts, shipping notifications only) because the channel is more intrusive and quickly gets fatigued if overused.

Expected ROI and Payback

For a properly optimized e-commerce store, email marketing generates an average of 25% to 35% of total revenue. This is massive, which is why investing in Klaviyo is a no-brainer. At Stellar Projects, we have clients for whom email accounts for up to 42% of turnover (a record for a beauty brand with a highly engaged base).

The payback time is generally 1 to 3 months. Concretely: you invest €150/month for Klaviyo + about €1000 for a well-done initial setup (templates, flows, segmentation). From the second month, email generates enough revenue to cover the investment, and then it's pure profit.

Numerical example for a store with €50k monthly turnover: with optimized email marketing representing 30% of turnover, you generate €15k via Klaviyo. Total cost: €150/month subscription + let's say 10 hours of monthly internal management (campaigns, monitoring) or about €400 in loaded salary cost. Total €550 to generate €15k. ROI: 27:1. It's mathematical.

Total Cost of Ownership

Beyond the Klaviyo subscription, include in your budget: the initial setup (between €1500 and €5000 depending on whether you do it internally, with an agency, or via a freelancer), custom branded template design if you don't want to use Klaviyo's (budget €800-€2000 for a complete kit), and monthly management time ranging from 5 hours (bare minimum, just monitoring) to 20+ hours (weekly campaign creation, testing, optimizations).

At Stellar Projects, our Klaviyo support services start at €2500 for a complete setup including 10 essential flows, branded templates, advanced segmentation, and team training. For brands that prefer to delegate entirely, our delegated management formulas are around €1500/month (regular campaigns + monitoring + continuous optimization).

Common Mistakes to Avoid

Over-solicitation is the #1 mistake we observe. Some brands send 5 emails a week to their entire database, then are surprised to see their open rates plummet and unsubscribes skyrocket. Email fatigue is real: beyond 3-4 emails weekly, you enter a dangerous zone. At Cabania, we send a maximum of 2 emails per week (excluding automatic flows), and our unsubscribe rate remains below 0.15%.

Poor segmentation, or worse, no segmentation, kills performance. Sending the same email to your entire database ("spray and pray") converts 2 to 3 times less than an email segmented by behavior or profile. If you do only one thing after reading this article, start segmenting: new vs. returning at a minimum, ideally by product category and engagement level.

Neglecting mobile optimization is inexcusable in 2025. Test ALL your emails on iPhone and Android before sending. A template that looks good on desktop but breaks on mobile means 70% of your recipients see an illegible mess and delete it immediately.

Ignoring A/B tests is a costly mistake. Each successful test improves your performance by 5, 10, sometimes 30%. Over a year, the cumulative effect is massive. Yet, many brands still send the same emails with the same subject lines without ever testing variations. That's leaving money on the table.

Poor send timing can hurt your performance. There is no universal optimal time; it depends on your audience. Test: for Superbon (female target 30-50 years old), the sweet spot was Tuesday and Thursday at 11 am. For Cabania (parents of young children), Sunday 8:30 pm worked surprisingly well (calm time after children's bedtime). Your customers have their own rhythms; discover them.

Under-leveraging Shopify data is a waste. Klaviyo gives you access to a behavioral goldmine; use it! Products viewed, categories explored, average cart value, purchase frequency—it's all there. Yet, we still see brands sending generic emails without any dynamic personalization.

Not regularly cleaning your lists gradually degrades deliverability. Inactive contacts who never open your emails signal to ESPs (Gmail, Outlook) that your content is not relevant. Result: you start landing in spam, even for your engaged contacts. Implement a sunset policy and accept reducing your database to improve its quality.

Our Klaviyo Support at Stellar Projects

Audit and Personalized Strategy

At Stellar Projects, we always start with a comprehensive audit of your current setup, whether you're already on Klaviyo or another tool. This audit analyzes: your existing flows and their performance, your segmentation (or lack thereof), your email design and conversion rates, your deliverability, and your immediate quick wins.

We also systematically benchmark your competitors: what emails they send, what frequency, what offers, what tone. Not to copy, but to identify differentiation opportunities and industry best practices to adapt. In the ultra-competitive cosmetics market, this competitive analysis allowed us to identify that 80% of brands neglected post-purchase, creating a massive opportunity for Superbon.

The resulting personalized roadmap prioritizes actions by impact/effort: quick wins first (often correcting a misconfigured flow or improving a subject line), then medium-term projects (advanced segmentation, new flows), and finally long-term projects (custom integrations, complex automation).

Complete Setup and Migration

Our complete setup service includes: technical Klaviyo-Shopify configuration with all advanced synchronizations, creation of the 10 essential flows (welcome, abandoned cart, post-purchase, browse abandonment, back in stock, win-back, VIP, etc.), design of branded and mobile-optimized email templates, and implementation of basic segmentation (minimum RFM, behavioral by category).

If you are migrating from Mailchimp, Omnisend, or another tool, we manage the entire process: export of your database with preservation of history (to the extent technically recoverable), recreation of your segments and flows in Klaviyo, progressive migration with a double-send period to secure the transition, and most importantly, zero downtime. Your customers shouldn't even notice the change.

Team training is systematically included: a 2-3 hour session via video conference or in-person where we train your marketing teams in daily Klaviyo use, campaign creation, performance analysis, and best practices. We also provide custom documentation adapted to your specific setup, not a generic guide.

Support for 30 days post-launch ensures you are never stuck: technical questions, flow optimizations, strategic advice, we remain available during the critical start-up phase.

Delegated Management for Hyper-Growth Brands

For brands that prefer to focus on their core business (product, acquisition, ops), we offer full delegated Klaviyo management: creation and sending of monthly campaigns (product newsletters, promotions, launches), continuous flow optimization (A/B testing, adjustments based on performance), weekly KPI monitoring with alerts in case of anomaly, and detailed monthly reporting with recommendations.

This model works particularly well for brands generating €200k+ in monthly revenue: at this stage, email generates €50k-€80k in monthly revenue, and having a dedicated specialist who continuously optimizes makes a measurable difference of several thousand euros per month. The cost of delegated management (€1500-€2500/month depending on complexity) is largely amortized by the additional performance generated.

Why Work with a Shopify Agency on Klaviyo?

The question is worth asking: why call on a specialized Shopify agency rather than managing Klaviyo internally or via a generalist email marketing freelancer?

Our added value at Stellar Projects rests on three pillars: we are e-commerce practitioners ourselves (Superbon, Cabania), not just consultants. We know the operational reality, stock constraints, margin issues, acquisition vs. retention trade-offs. This field experience informs our strategic recommendations.

Our Shopify technical expertise makes all the difference in advanced integrations. A classic email marketing consultant may not know how to leverage Shopify metafields in Klaviyo, how to properly configure product tracking on a custom theme, or how to integrate Klaviyo with your ERP via API. We do, because it's our daily business.

Finally, our holistic approach connects email to the rest of your marketing stack: CRO, SEO, paid acquisition. Email doesn't live in a silo; it integrates into a global strategy. When we optimize your Klaviyo flows, we also look at your Shopify conversion funnel, your landing pages, your merchandising. Our personalized Klaviyo support is part of this 360° vision.

Still hesitating on how to choose the right partner for your Klaviyo project? We offer a free 30-minute audit where we analyze your current setup, identify your quick wins, and give you actionable recommendations immediately, whether you work with us or not. Zero BS, 100% value.

Contact us to discuss your Klaviyo project. Whether you're starting from scratch or looking to optimize an underperforming existing setup, we've probably dealt with a similar case and know exactly how to unlock your email growth.