How to Integrate Klaviyo with the Custlo Shopify App?

Running a successful Shopify store isn't only about having amazing products; it's also about how to engage with your customers. There are various apps that can be integrated with Shopify to improve engagement and increase revenue. Custlo and Klaviyo are one of them. Both apps, when integrated together, bring a huge difference in sales and customer retention.

By doing Klaviyo integration with Custlo, you can take your marketing to the next level. It will allow you to automatically sync details, get customer details, and understand their purchase behavior, so you can:

• Send personalized messages according to their customer behavior and feedback.
• Group customers based on their details, ratings, and purchase history.
• Trigger review requests, send abandoned cart mails, and inform them about loyalty campaigns automatically.

This blog will help you understand what both apps are, how to integrate Klaviyo with Custlo Shopify app, and why to integrate it.

Custlo is a Shopify app that helps businesses optimize their store by understanding customer behavior and data-driven insights. It focuses on:

• Tracking customer interactions: Understand how customers browse, add products to cart, or engage with your store.
• Driving personalized experiences: Use behavior data to trigger targeted campaigns or offers.
• Automating marketing actions: Sync events like purchases, abandoned carts, or other behaviors with tools like Klaviyo.
• Improving conversions: Analyze trends and insights to optimize sales funnels and retention strategies.

Klaviyo is an email and SMS marketing platform specially made for e-commerce platforms. It helps online stores like Shopify, WooCommerce, and BigCommerce personalize communication with their customers.

• Send automated messages for welcome series, abandoned cart reminders, and post-purchase follow-ups.
• Group customers based on their behavior, purchase history, and engagement.
• Use advanced analytics to track customer revenue from campaigns and growth trends.

When you integrate Klaviyo with Custlo, Custlo helps you collect valuable customer insights, and Klaviyo uses that data to start personalized marketing campaigns.

Custlo is designed to help Shopify merchants who want to show customer details, while Klaviyo is a powerful marketing automation tool. By combining them, you can gather feedback and turn marketing data into actionable insights and conversions.

Boost trust with proof

Modern shoppers rely heavily on trust signals before making a purchase. Use insights from Custlo to create campaigns that feel relevant and timely. By highlighting customer interactions or popular products, you build credibility and encourage engagement.

Personalize marketing at scale

Every customer interaction provides valuable signals. With Custlo data in Klaviyo, you can connect with your audience based on purchase behavior, engagement patterns, or feedback. This makes it easy to send targeted campaigns that match different customer groups.

Recover more abandoned carts

Combining Custlo insights with Klaviyo abandoned cart flows allows you to send personalized reminders based on actual customer behavior, increasing the likelihood of completing the purchase.

Strengthen customer retention

With the integration, you can automate retention campaigns such as thank-you messages, re-engagement flows, and loyalty offers. Over time, these targeted interactions help turn one-time shoppers into repeat buyers and foster long-term loyalty.

Before you start syncing customer data, you need to have Custlo installed on your Shopify store. Let’s see how to do it:

• Ensure you have a Shopify store and Custlo app installed.
• Have an active Klaviyo account.
• Ensure admin-level access to both Shopify and Klaviyo.

Without these, you won’t be able to install apps, generate API keys, or manage integrations.

1. Go to the Shopify App Store and search for “Custlo”.
2. Click on Add App and approve required permissions.
3. Once done, click Confirm Installation to complete the process.

1. Log in to your Klaviyo account.
2. Go to Account > Settings > API Keys.
3. Create or copy an existing private API key.

This key acts as a secure link that allows Custlo to send customer data to Klaviyo. Keep this key safe — it provides access to your Klaviyo data.

1. Open the Custlo app from your Shopify admin dashboard.
2. Go to the Integrations tab and select Klaviyo.
3. Paste your Klaviyo API key in the provided field.
4. Click Save Changes.

This establishes a connection between Custlo and Klaviyo, enabling smooth data flow between apps.

One of the biggest advantages of the Custlo–Klaviyo integration is flexibility. You can sync customer details, product data, and even order tracking. This ensures Klaviyo has the right data to power personalized campaigns.

For example, you can send review requests, loyalty campaigns, or Klaviyo Shopify abandoned cart emails using Custlo’s synced data.

1. Place a test order in your Shopify store or submit data through Custlo.
2. Log in to your Klaviyo dashboard and verify that the data synced successfully.
3. Test your Klaviyo flows to ensure they are triggered properly.

This helps confirm the integration works correctly before launching campaigns.

Once your integration is complete, you can use Klaviyo’s automation tools to their fullest. For example:

• Send automated review requests after purchase.
• Give loyalty rewards to frequent customers.
• Send re-engagement campaigns or Klaviyo Shopify abandoned cart reminders.

Integrating Custlo with Klaviyo gives you an amazing advantage. Custlo collects customer data, while Klaviyo turns it into actionable insights and marketing campaigns.

Whether you want to build trust, increase sales with Klaviyo Shopify abandoned cart flows, or strengthen retention through automation — this integration helps your store grow faster and retain customers longer.