Quick Verdict: Shopify vs BigCommerce Cookie Consent
Both platforms set cookies by default, but their consent architectures differ in meaningful ways. The table below summarises the key differences before the detailed breakdown.
| Feature | Shopify | BigCommerce |
|---|---|---|
| Built-in cookie banner | No native banner; relies on app ecosystem | Basic built-in consent banner available |
| Default analytics cookies | _shopify_y, _shopify_s, _shopify_sa_t, _shopify_sa_p | Platform analytics via Google Analytics integration |
| Consent API | Customer Privacy API (4 categories) | Storefront Consent API (3 categories) |
| Script blocking | Via Customer Privacy API integration | Via Script Manager category assignment |
| Checkout consent control | Limited - external scripts blocked on checkout.shopify.com | Full control - checkout on same domain |
| Headless support | Hydrogen with manual consent wiring | Stencil themes and headless via API |
| Third-party CMP integration | App Store ecosystem | Script injection or app marketplace |
Default Cookies: What Each Platform Sets
Shopify stores set several first-party cookies the moment a visitor lands on the page. The most common are _shopify_y (a persistent visitor identifier lasting up to two years), _shopify_s (a session-level cookie), _shopify_sa_t and _shopify_sa_p (both tied to Shopify's built-in analytics). These Shopify-specific cookies fire by default unless you configure the Customer Privacy API to block them until consent is granted.
Under Article 5(3) of the ePrivacy Directive, any cookie that is not strictly necessary for the service requested by the user requires prior consent. Shopify's analytics cookies track visitor behaviour and are not essential for the cart or checkout to function, which means they need consent before being set on devices belonging to visitors in the EU, UK, and other jurisdictions with similar rules.
BigCommerce takes a lighter approach. The platform sets session and cart cookies that qualify as strictly necessary, but does not drop proprietary analytics cookies. Tracking cookies appear only when you enable integrations - connecting GA4 adds _ga and _ga_* cookies, enabling Meta Pixel adds _fbp, and so on. This means BigCommerce stores start with fewer non-essential cookies to manage.
Consent Infrastructure: APIs and Script Blocking
Shopify's Customer Privacy API
Shopify provides four consent categories through its Customer Privacy API: analytics, marketing, preferences, and sale of data. A consent management platform collects the visitor's choices, maps them to these four signals, and passes them to the API. Shopify then conditionally loads or blocks its own tracking scripts based on those signals.
This approach is powerful but requires proper integration. Consent must be recorded only when the visitor actively interacts with the cookie banner - never automatically on page load. You should never read or modify Shopify cookies directly, as doing so breaks when Shopify releases platform updates.
BigCommerce's Script Manager and Consent API
BigCommerce offers a Storefront Consent API with three categories: Analytics, Functional, and Targeting/Advertising. The platform also provides a built-in cookie consent tracking feature that can be enabled under Settings, then Security and Privacy.
The Script Manager lets you assign each script to a category: Essential, Analytics, or Functional. When cookie consent tracking is enabled, BigCommerce blocks non-essential scripts until the visitor accepts. There is a significant caveat, though. This blocking only works for scripts added through Script Manager. Scripts injected by BigCommerce apps or hardcoded in Stencil theme files are not covered, which creates a compliance gap if you rely solely on the built-in feature.
The Checkout Domain Problem
This is where Shopify creates a unique headache. Shopify's checkout process runs on checkout.shopify.com, a separate domain from your storefront. External scripts - including consent management solutions - cannot be injected into this checkout flow. Shopify restricts what runs on its checkout pages for security and PCI compliance reasons.
Strictly necessary cookies powering the cart, checkout, and login do not require consent under GDPR or the ePrivacy Directive. So the checkout itself is not necessarily a compliance failure. The problem arises when analytics or marketing scripts fire during the checkout journey without consent having been properly passed through from the storefront. Payment gateway cookies add another layer of complexity to this domain-split issue.
BigCommerce does not have this issue. Checkout runs on the same domain as the storefront, giving you full control over which scripts load at every stage of the purchase flow. If you use a CMP, it covers the entire customer journey - browsing, cart, checkout, and confirmation - without domain boundary complications.
For stores selling across the EU, this single-domain advantage makes BigCommerce simpler to bring into compliance with ecommerce cookie rules.
Script Injection and Third-Party Pixels
Both platforms compound the cookie problem through third-party integrations. Meta Pixel (_fbp), Google Analytics (_ga, _ga_*), TikTok Pixel, and similar tracking scripts each set their own cookies. Conditionally loading these scripts based on consent is essential for compliance.
On Shopify, third-party pixels added through the Shopify Pixels system respect the Customer Privacy API. Pixels added through older methods - direct theme code injection or apps that predate the Pixels framework - may not. A thorough audit of how each pixel is loaded is necessary before you can trust that consent signals are being honoured.
BigCommerce's Script Manager provides clear category assignment for each script you add. Scripts set to Analytics or Functional categories are blocked until the visitor consents. But scripts loaded through BigCommerce apps or injected directly into Stencil theme templates bypass this system entirely. Both platforms, then, require you to verify every tracking script's loading behaviour rather than assuming the built-in tools cover everything.
Google Consent Mode v2 adds another layer. Both Shopify and BigCommerce stores running Google tags need Consent Mode properly configured to send the correct consent signals (ad_storage, analytics_storage, ad_user_data, ad_personalization) to Google. Without this, you risk losing Google Ads conversion data or running afoul of Google's own EU consent requirements. Kukie.io supports Google Consent Mode v2 integration on both platforms.
Headless and Custom Storefronts
Shopify's headless framework, Hydrogen, requires manual consent wiring. You must implement the Customer Privacy API yourself, collect consent through your own banner or a CMP, and pass signals correctly. There is no automatic script blocking in a headless Shopify build.
BigCommerce supports headless commerce through its APIs alongside the traditional Stencil theme engine. In a headless BigCommerce setup, the built-in cookie consent tracking does not apply. You need a dedicated consent solution that integrates at the front-end layer, just as with Shopify Hydrogen.
For headless builds on either platform, a third-party CMP becomes practically mandatory. The built-in consent tools on both platforms are designed for their respective theme engines, not for decoupled front ends.
Which Platform Is Easier to Make Compliant?
BigCommerce has a slight edge for basic compliance out of the box. The built-in consent banner, Script Manager category controls, and same-domain checkout mean a small store can achieve a reasonable level of compliance without installing additional apps.
Shopify requires more setup. There is no native cookie banner, the Customer Privacy API needs a compatible CMP to function, and the checkout domain limitation adds complexity. Shopify's app ecosystem is larger, though, and the Customer Privacy API is more granular with four consent categories compared to BigCommerce's three.
| Compliance Factor | Shopify | BigCommerce |
|---|---|---|
| Out-of-box consent banner | Requires app or CMP | Built-in option available |
| Script blocking granularity | 4 categories via API | 3 categories via Script Manager |
| Checkout cookie control | Limited (separate domain) | Full control (same domain) |
| App/plugin ecosystem for consent | Large (Shopify App Store) | Smaller but adequate |
| Google Consent Mode v2 support | Via CMP integration | Via CMP or manual setup |
| Consent proof recording | Via CMP only | Via CMP only |
For stores targeting multiple jurisdictions, both platforms benefit from a dedicated CMP that handles geo-detection, granular cookie categories, and automatic script blocking. Relying solely on built-in tools leaves gaps on both platforms, particularly for apps and theme-level scripts.
If you are evaluating Shopify against other platforms, similar comparisons apply to Shopify vs WooCommerce, Shopify vs Squarespace, Shopify vs Wix, and Shopify vs Magento - each has distinct cookie consent trade-offs worth understanding before committing.
Frequently Asked Questions
Does Shopify provide a built-in cookie consent banner?
No. Shopify provides the Customer Privacy API, which is a developer-facing tool for receiving consent signals. It does not include a visual banner. You need a third-party app or custom code to display a banner and collect consent from visitors.
Can I show a cookie banner on Shopify's checkout page?
No. Shopify restricts third-party scripts on the checkout page for PCI compliance reasons. Consent collected on the storefront is synced to checkout through the Customer Privacy API, but the banner itself cannot appear on the checkout page.
Does BigCommerce block cookies before consent automatically?
BigCommerce blocks non-essential scripts added through its Script Manager when cookie consent tracking is enabled. Scripts injected by apps or hardcoded in Stencil theme files are not covered by this automatic blocking and need separate handling.
Which platform is better for GDPR cookie compliance?
BigCommerce is simpler to make compliant out of the box thanks to its built-in consent banner and same-domain checkout. Shopify offers more granular control through its Customer Privacy API but requires a third-party CMP and careful configuration to reach the same level of compliance.
Do I need a third-party CMP on Shopify or BigCommerce?
For basic compliance on BigCommerce, the built-in tools may suffice for simple stores. For Shopify, a CMP is practically required. For either platform serving visitors across multiple jurisdictions with geo-targeted consent rules, a dedicated CMP provides more reliable coverage than built-in features alone.
How do Shopify and BigCommerce handle Google Consent Mode v2?
Neither platform has native Google Consent Mode v2 support built in. Both require a CMP or manual implementation to send the correct consent signals (ad_storage, analytics_storage, ad_user_data, ad_personalization) to Google tags.
Take Control of Your Cookie Compliance
Whether you run a Shopify or BigCommerce store, a free cookie scan shows you exactly which cookies your site sets and which ones need consent. Kukie.io detects and categorises every cookie across your storefront, with step-by-step installation guides for both Shopify and BigCommerce.
