For Shopify merchants who sell bundles or multi-product sets, it’s often frustrating when reviews only display for the main product but not for all items included in the bundle. The good news is that Reviews.io provides a flexible way to group products together and display star ratings and feedback in one place.
In this guide, I’ll show how to set up Reviews.io so your Shopify store shows reviews from both the main product and any bundled products.
Why Bundle Reviews Matter
When customers buy a set, such as a starter kit or a performance bundle, they want to see feedback for everything included—not just the parent product. By grouping reviews:
- You build trust with new visitors.
- You increase conversions by showing social proof.
- You make product pages look richer and more informative.
Instead of scattering reviews across multiple pages, you can centralize them where they matter most: right under the product title or in the dedicated reviews section.
Step 1: Create a Metafield for Bundled Products
Shopify metafields let you link additional products to your main product. In this case, we’ll use a metafield called reviews_bundle.
Each product in your bundle should be referenced here. This way, Shopify knows which products to include when building your review group.
Step 2: Capture All SKUs and IDs
Next, you’ll need a snippet of Liquid code that collects the SKUs and variant IDs from the main product and any products stored in the metafield.
Here’s a clean version of the code:
This ensures your SKU list is clean and free from line breaks, which is essential for Reviews.io to read it correctly.
Step 3: Add the Reviews.io Polaris Widget
Now, drop the Polaris widget onto your product page template. Make sure the sku and grouping values use the reviewssku variable we just captured.
<script src="https://widget.reviews.io/polaris/build.js"></script>
<div id="ReviewsWidget"></div>
<script>
new ReviewsWidget('#ReviewsWidget', {
store: 'yourstore.com',
widget: 'polaris',
options: {
product_review: {
sku: "{{ reviewssku }}",
enable_rich_snippets: true
},
questions: {
grouping: "{{ reviewssku }}"
}
}
});
</script>
This widget will now pull in reviews from both your main product and all linked bundle products.
Step 4: Place Star Ratings Under Product Titles
If you’d like the star rating snippet to appear right under your product titles, you can use the lightweight Reviews.io rating snippet. Simply reference the same SKU group, and the star rating will display correctly across bundles.
Wrapping Up
Showing Reviews.io bundle reviews on Shopify is more than just a technical tweak—it’s a conversion booster. By grouping product reviews, you give shoppers the confidence they need to add a bundle to their cart.
With just a few lines of Liquid code and the right widget settings, you can ensure your star ratings and reviews reflect the full value of what you’re selling.
Store Setup