Is my store’s code uploaded anywhere?

No. The check runs in your browser with JavaScript; the page source never leaves the page. Only anonymous counts, such as the number of third-party hosts, are recorded for usage statistics.

Why do scripts from apps I uninstalled still load?

Apps that edited your theme files directly can leave snippets and script tags behind, because uninstalling an app doesn’t undo edits to theme code. Apps built as theme app extensions don’t edit theme code, so their app embeds are managed from the theme editor instead.

Is it safe to delete a script I don’t recognise?

Not without checking. Some scripts handle reviews, subscriptions, tracking or checkout features you still use. Duplicate your theme, remove one thing at a time on the copy, and test the pages and cart before publishing.

Why is a host marked “Not recognised”?

The checker names a short list of common apps and tags by their script domain. Anything else is listed by host only; searching the host name usually tells you which app it belongs to.

Shopify app script checker

See every third-party script your Shopify store loads, which app put it there, and which ones block the page from rendering. Paste your store’s page source or theme.liquid; the check runs in your browser and nothing is uploaded.

How to get your page source

Open your store’s home page in Chrome, Edge, Firefox or Safari on a computer.
Right-click the page and choose View Page Source, or press Ctrl+U on Windows or Option+Command+U on a Mac. In Safari, turn on the Develop menu first.
Select all, copy, and paste it below. You can paste your theme’s theme.liquid file instead.

Page source or theme.liquid

Want it cleaned up for you?

The Shopify Speed & Checkout Tune-Up measures your home, collection, product and cart pages on mobile, removes leftover app scripts, fixes oversized images, render-blocking code, fonts and layout shift on a duplicate theme, and reviews cart to checkout. You see the before and after and publish it yourself. $750, 5 business days.

Pay $750 & start How the Tune-Up works

Questions

Is my store’s code uploaded anywhere?: No. The check runs in your browser with JavaScript; the page source never leaves the page. Only anonymous counts, such as the number of third-party hosts, are recorded for usage statistics.
Why do scripts from apps I uninstalled still load?: Apps that edited your theme files directly can leave snippets and script tags behind, because uninstalling an app doesn’t undo edits to theme code. Apps built as theme app extensions don’t edit theme code, so their app embeds are managed from the theme editor instead.
Is it safe to delete a script I don’t recognise?: Not without checking. Some scripts handle reviews, subscriptions, tracking or checkout features you still use. Duplicate your theme, remove one thing at a time on the copy, and test the pages and cart before publishing.
Why is a host marked “Not recognised”?: The checker names a short list of common apps and tags by their script domain. Anything else is listed by host only; searching the host name usually tells you which app it belongs to.

Next: the Shopify speed checklist.

Fixed-price help

Fixed scope, fixed price, paid upfront. The work happens in writing; no call needed.