Competitor research
See which visible tools, scripts, theme signals, and public products a Shopify storefront exposes.
Chrome extension for Shopify research
GRT StackLens Performance: Shopify app and theme detector
Inspect a Shopify storefront's visible apps, theme signals, scripts, speed clues, and public best sellers before you audit, rebuild, or compete.
No Shopify login
Public signals only
Built for quick audits
The Chrome Web Store listing is live. Install the extension and start with a public Shopify storefront.
Public scan
GRT StackLens
ThemePaid signal
Apps12 visible
ScriptsReview
Reviews app detected with strong confidence
Third-party script weight needs review
Best-selling product feed available
Use results as audit clues, not proof
No Shopify login
Scan public storefront pages without asking for admin access.
Private by design
No passwords, cookies, form values, checkout data, or cart data are intended to be read.
Fast first read
Open the popup to inspect visible apps, theme clues, script weight, and timing signals.
Built by Shopify developers
Use the scan as a practical starting point for app audits and rebuild planning.
Use cases
Know what a Shopify store exposes before you make a build decision.
StackLens gives merchants, developers, and agency teams a quick storefront read before spending time on a full technical audit.
App cost audit
Find app categories that may be slowing the store or creating subscription bloat.
Rebuild planning
Collect public signals before replacing apps with theme code, custom sections, or private apps.
Performance triage
Use timing and third-party script clues to decide what deserves a deeper Lighthouse or code audit.
What it finds
Add to Chrome
Fast signals for app stack, theme, and performance research.
Theme signal
Classifies the visible theme as free, paid, custom, or unknown where public clues allow it.
Visible apps
Groups detected storefront apps by category with confidence labels.
App changes
Shows new or removed apps compared with the previous local scan of the same store.
Speed clues
Surfaces quick browser timing, script count, JavaScript weight, and long-task clues where available.
Script detail
Opens a third-party JavaScript view so noisy vendors are easier to spot.
Best sellers
Checks the store public best-selling products feed when the storefront allows it.
How it works
Three steps from storefront visit to action plan.
Open a public Shopify storefront
Visit the homepage, product page, or collection page you want to inspect.
Let StackLens read public signals
The extension checks Shopify clues, DOM markers, scripts, metadata, and browser timing data.
Review the popup report
Use the result to decide whether the store needs app cleanup, performance work, or custom development.
Result meaning
Theme signals are helpful, but they are still best-effort.
Free themeThe theme name matches a known free Shopify theme.
Paid themeA theme store id is visible, so the result is a best-effort paid-theme signal.
Custom themeNo theme store id was visible, which often means custom or heavily modified work.
Unknown themeTheme data was unavailable or hidden from public storefront signals.
Confidence labels
App detection labels keep weak evidence visible.
DetectedStrong public signal such as rendered DOM or DOM plus script evidence.
RunningApp code appears initialized on the current page.
PossibleWeak signal that needs human review before decisions are made.
Seen activePreviously confirmed locally, but not strongly visible in the latest scan.
No resultNot visible from public storefront signals. This is not proof that the store does not use the app.
After the scan
Turn the report into a cleaner Shopify build.
If the scan exposes too many scripts, overlapping app categories, or slow storefront clues, GR Trading can review the stack and plan what to keep, replace, or custom-build.
Designed for public storefront inspection, not admin access.
Page access
Shopify stores can run on any custom domain, so automatic detection needs permission to run on ordinary web pages.
Local first
On pages that do not look like Shopify, the extension runs a quick local check and stops.
Events
Install, popup open, Rescan, and CTA click events may be sent with limited diagnostic fields.
Store data
A Rescan may send detected app names, categories, status, confidence, and best-effort plan inference for internal reports.
Visible signals are not the same as private proof.
StackLens can miss apps that run server-side, only appear in checkout, load after login, hide scripts, or run on pages the scanner has not inspected.
Speed indicators are quick diagnostics based on browser timing and resource data. They are useful triage clues, not a full Lighthouse audit.
Best-seller data depends on whether the store's public products feed is available, enabled, and non-empty.
Questions
Answers before you install.
Can it prove every Shopify app a store uses?
No. Server-side apps, checkout-only apps, login-only tools, hidden scripts, and apps on other pages may not be visible.
Does it replace a full performance audit?
No. It gives fast storefront clues. Use it to decide what deserves a deeper Lighthouse, theme-code, or app-stack audit.
Does it write to the Shopify store?
No. It inspects public storefront signals and does not write to the viewed Shopify store.
Why are some recommendations shown?
Recommendations are based on visible categories and common ecommerce app needs. They are not proof that a merchant needs a specific app.
GRT StackLens Performance
Start with public storefront signals before you spend on another Shopify app or rebuild.
Install the extension from the Chrome Web Store or ask GR Trading to review your current app stack, scripts, and theme performance.