What is Shopify Catalog? A plain guide for merchants

If you sell on Shopify, your products are probably already in Shopify Catalog. Most merchants never turned it on and have never looked at it. This guide covers what it is, who reads it, and what you can and can’t change.

The short answer

Shopify describes it this way: “Shopify Catalog is a structured source of product information gathered from eligible products that are sold by stores on Shopify” (Shopify Help Center).

In practice it’s one big, searchable index of products from Shopify stores. AI shopping channels query it instead of each store building a separate feed for each channel. Shopify’s help page says Shop, “select AI platforms, shopping sites, and AI agents” can use it to “search and understand product information, such as titles, descriptions, images, pricing, options, and availability.”

How your products get in

You don’t apply. If your store and products meet the requirements, they’re included automatically. Shopify says so plainly: “your products are automatically included in Shopify Catalog, and you don’t need to take any additional action.”

The requirements are short, and we cover each one in Shopify Catalog requirements: why products get left out. The easiest ones to miss are private mode, a price of zero, a missing image, and products that aren’t published to the online store.

You also can’t leave. The same page says: “You can’t opt out of Shopify Catalog itself.” You can stop individual AI channels from reading your products, which we cover below.

Who reads it

Shopify connects your products to AI channels through a feature it calls agentic storefronts. Its help page lists “ChatGPT, Google AI Mode and Gemini, Microsoft Copilot, and Meta” as examples (agentic storefronts). The Shop app counts too: Shopify calls Shop an agentic storefront channel that uses Shopify Catalog (Managing agentic storefronts).

Two details are easy to miss:

• Google works differently. Shopify’s page for Google AI Mode and Gemini says products reach Google “through the Google & YouTube sales channel or Google Merchant Center” (Selling on Google AI Mode and Gemini). For Google, your Merchant Center data matters as much as the catalog.
• ChatGPT sends shoppers to your store. Shopify describes ChatGPT as “a discovery-focused referrer platform.” Shoppers finish on your own checkout in an in-app browser (Selling on ChatGPT). Copilot, Google and Meta can use a Shopify-powered checkout inside the chat instead.

What Shopify adds to your listing

This is the part most merchants don’t know about. Shopify Catalog doesn’t just pass your product copy along. It processes it.

When Shopify announced the Agentic plan in January 2026, it described the catalog as a collection of products “that uses specialized LLMs to categorize, enrich, and standardize product data” (Shopify news, Jan 11, 2026). The December 2025 launch post says it “infers categories, extracts attributes, consolidates variants, and clusters identical items” (Shopify news, Dec 10, 2025).

Shopify’s developer docs are specific about which fields that covers. In the Global Catalog reference, the product description, options, metadata.attributes, metadata.tech_specs, metadata.top_features and metadata.unique_selling_points are all marked Inferred, meaning they’re “generated or enriched by Shopify” (Global Catalog docs). The docs add that these fields “might vary in accuracy depending on available product data” and should be treated “as discovery and merchandising signals, not as merchant-authored source text.”

So an AI agent reading the catalog may get a description, a list of top features and a set of selling points for your product that you didn’t write. We go through each field in What Shopify’s AI adds to your product listings.

Why that matters

A summary written by a model is usually close to your copy. Sometimes it isn’t. On Sep 24, 2026 we read the catalog’s version of 192 top-ranked products and checked 3,546 claims against each brand’s own words. 14% of the products were described to AI agents with a claim that directly contradicts the brand on health, safety or what’s in it (how we checked). The full write-up, with examples, is in We checked 192 products Shopify describes to AI agents.

That’s one day and the top results only, so it isn’t a rate for your store. It’s a reason to look.

What you control

You can’t edit the catalog’s summary directly. Nobody outside Shopify can. You do have a few real controls:

• Your own product data. Shopify’s advice is to use “clear, accurate, and detailed descriptions” and fill in title, description, images, type, vendor, collections, tags, barcode and variants (Optimizing your products for AI platforms). This is the input everything else is built from.
• Catalog Mapping. Under Sales channels > Agentic, you can choose which field or metafield the catalog uses for a product’s title, description and category, and how variants are grouped. Shopify notes the mappings “are inputs that can influence Shopify Catalog” and that “changes are processed with a delay” (Mapping your product data sources).
• Which AI channels can read it. Turn off Allow Shopify to manage for me and you can switch off Shopify Catalog access per channel, or for all third-party channels. Shopify warns “it can take up to 7 days” to take effect, and that your products can still be found through web crawling.
• Hiding a product entirely. Shopify’s answer is the Unlisted status or the seo.hidden metafield, which also hides the product from search engines and your own store search (Managing agentic storefronts).
• Store facts. The free Shopify Knowledge Base app lets you review and edit the FAQs AI platforms use to answer questions about your store (Shopify Knowledge Base). It covers store-level questions like returns and shipping, not individual product claims.

Common questions

Is Shopify Catalog the same as the catalogs in Shopify Markets or B2B?

No. Those are price lists and product sets for specific markets or companies. Shopify Catalog is the AI-facing product index described here.

Does being in the catalog mean ChatGPT will recommend my products?

No. Shopify says inclusion “doesn’t guarantee that a product will appear in a specific AI answer, be ranked in a specific position, or be displayed by every channel.” Each channel ranks results its own way. We cover what they look at in How AI shopping agents choose which products to show.

Can I see what the catalog says about my products?

Shopify’s admin has a search preview under Sales channels > Agentic that shows how your products rank for a query, with listing-quality hints. It doesn’t put the catalog’s inferred description next to your own copy.

That comparison is what we built Hearsay to do. The free scan reads what the catalog tells AI agents about 5 of your products, puts it next to what you wrote, and flags each claim you never made. It also counts how many of your products are in the catalog at all.