The 3 best Shopify apps for a high-performing marketing and customer service tech stack

Disclaimer: This blog post was written in partnership with Daily Mentor. No compensation was exchanged for this collaboration.

Growing a Shopify brand from early traction to consistent, profitable scale takes more than a great storefront. As your order volume and product catalog expand, so do your needs around personalization, customer support, loyalty, and the creative work that fuels paid growth.

Shopify handles a lot of this—about 80% of what a scaling brand needs. The rest is where a connected app ecosystem comes in.

The goal isn’t to bolt on more tools. It’s to connect data and actions so every customer interaction, whether it happens over email or text message, onsite, or with your support team, feels timely and relevant.

Klaviyo sits at the center of that ecosystem as the foundation of lifecycle marketing, with integrations that make the rest of your stack smarter.

In my role as head of mentorship and Shopify expert at Daily Mentor, I regularly recommend and implement 3 apps for B2C brands in the $1–20 million range. Together, these apps help you increase average order value (AOV), build predictable revenue, deliver faster support, and turn loyal customers into advocates.

Let’s dig in.

1. Klaviyo: your marketing growth backbone

I use Klaviyo to engage every customer where they are. With AI and Klaviyo Data Platform (KDP), Klaviyo’s built-in customer data platform, I can drive revenue and loyalty without stitching tools together.

Deeper personalization, powered by better data

• Activate rich insights with KDP and personalize every touchpoint.
• Segment with any piece of data, from any source, across all time.
• 350+ integrations and flexible APIs centralize data and make it actionable.
• Identity resolution, webhooks, and data syncing keep profiles accurate.
• Recency, frequency, and monetary (RFM) analysis and funnel analysis surface high-value groups and journey drop-offs.

Marketing impact: I build precise segments in seconds and tailor messaging to what matters most right now.

“Beyond having a best-in-class product, the beauty of Klaviyo is the ecosystem around it,” says George Kapernaros, CEO and founder of YOCTO. “Every serious Shopify app integrates with Klaviyo, and every new app prioritizes doing so.”

“This means brands can centralize their data, keep a single source of truth, and turn their data into revenue with minimal friction,” Kapernaros explains. “That’s the reason we recommend it to every brand we work with.”

Best-in-class channels, one unified canvas

• Orchestrate email, text messaging (SMS/RCS), mobile push, WhatsApp, and reviews from one place.
• Plan, launch, and measure campaigns across multiple channels, audiences, and messages on a single canvas.
• AI-powered channel affinity predicts which channel each customer is most likely to engage with next, making it easy and cost-effective to prioritize where to start when planning a multi-channel campaign. It then automatically routes your message there.
• Robust reporting and multi-touch attribution show what’s working and why.

Marketing impact: I run true omnichannel campaigns from just one place and prove impact across channels.

AI that drives results

• Predictive analytics forecasts next order date, lifetime value (LTV), spending potential, time between orders, and churn risk.
• Personalized product feeds anticipate what each customer will likely buy.
• Benchmarks show how I stack up against brands like mine.
• Self-driving experimentation with personalized campaigns A/B testing selects and sends the winning version for each subscriber.
• Form display optimization, reputation repair AI, and guided warming keep growth efficient and deliverability strong.

Marketing impact: I forecast value, pick the next best action, and let AI optimize performance—without manual guesswork.

Faster growth, simplified

• 160+ customizable email templates for quick, on-brand creative
• 60+ pre-built flows with an easy drag-and-drop builder
• No coding required, so teams move faster with confidence

Marketing impact: I go from brief to polished campaigns and flows in minutes, not days.

Klaviyo also connects directly with Shopify apps like Rebuy and Recharge for richer insights (more on those apps next). It’s the hub where data meets action, powering the retention strategies that fuel long-term growth.

2. Rebuy: personalization and higher AOV

Rebuy helps brands dynamically recommend products and build up-sells across the entire customer journey, not just at check-out.

What makes it stand out:

• Smart Cart offers free gifts, progress bars, and free shipping triggers. It also works with Shopify Markets so customers see the right recommendations for their region.
• Data sourcing pulls from customer history and AI-driven recommendations to personalize offers.
• Bundle builder is a new feature that lets shoppers create their own bundles through a dedicated landing page. This is becoming increasingly important as acquisition costs rise—encouraging first-time buyers to order multiple items can boost profitability.

Because it integrates deeply with Klaviyo, data from Rebuy can trigger flows that encourage higher AOV and repeat purchases.

“At Criquet, we’ve been using Rebuy for the past 3 years,” says Zach Scheimer, senior marketing operations manager at Criquet Shirts, an apparel brand. “We use it for product recommendations, Smart Cart, smart research, static and dynamic bundles, and post-purchase up-selling.”

“Having one tool across our whole website gives the customer a more unified experience and gives us data points across the entire customer journey,” Scheimer adds.

3. Recharge: predictable revenue through subscriptions

Subscriptions aren’t just about convenience. They’re about predictable revenue. Recharge makes that possible while plugging directly into Klaviyo and Rebuy.

Why it matters:

• Up-sell to subscriptions: I can start with one-time buyers and use Klaviyo flows to nudge them toward subscriptions.
• Customer flexibility: Customers can easily skip, change, or renew within their Shopify account.
• Loyalty features: Recharge now allows brands to reward customers for sticking with their subscriptions.
• Integration with support: Recharge connects to Klaviyo Helpdesk so you can edit subscriptions directly in your Klaviyo account.

“The financial benefit of Recharge’s subscription model is massive. Recurring revenue without additional cost of acquisition can completely transform the trajectory of a business,” says Kapernaros. “It gives you margin confidence, lets you spend more aggressively to acquire new customers, and stabilizes cash flow in a way one-time sales never can.”

“What we really like about Recharge is their analytics suite,” Kapernaros adds. “It’s so well-developed, and it gives brands the visibility they need to truly understand retention, churn, and LTV at a granular level.”

The depth of its integration with Klaviyo also sets Recharge apart. Marketers can track churn signals, renewals, and skips, and respond with automated flows that keep LTV high.

Why integration matters more than individual app features

There are thousands of apps in the Shopify app store. But the difference between a useful app and a transformative one is how well it plays with the rest of your stack.

The 3 apps above integrate seamlessly not just with Shopify, but with each other—and, most importantly, Rebuy and Recharge integrate with Klaviyo. That’s what creates compounding value:

• Rebuy data fuels personalized Klaviyo flows.
• Recharge subscriptions are managed seamlessly in Klaviyo Helpdesk.

It’s not about stitching together point solutions. It’s about building an ecosystem where data flows freely and every customer interaction is informed by the last.

Scaling from $1 million to $20 million in revenue requires more than a strong storefront. It requires a system that turns first-time buyers into loyal customers and loyal customers into advocates.

Together, these apps form the connective tissue that helps Shopify brands scale efficiently, profitably, and sustainably.