🔍
Checkout Detective
Built for Shopify & Plus|WooCommerceComing Soon|Install Free →

Fix broken checkouts.
Protect your ad spend.

Checkout Detective simulates real customer journeys on your live store — instantly catching unhandled JavaScript crashes, blocked Add-to-Cart buttons, and missing Meta & GA4 purchase events.

Add to Chrome — FreeExplore 7 Engines↓
✓5-Stage Funnel Machine
✓Meta & GA4 Auto-Verified
✓Click-to-Error Attribution
✓0ms Storefront Overhead
Live Stream
POST/cart/add.js(142ms)→Meta PixelViewContent(Verified)→CheckoutToken(Generated)
🔒store.myshopify.com/products/active-funnel
Live Audit
Checkout Detective Live Extension Dashboard
Works with:Shopify & Plus•WooCommerce (Coming Soon)•Meta Pixel (Advantage+)•Google Analytics 4 (GA4)•Dawn, Prestige & Impulse Themes
The Cost of Invisible Bugs

Why stores bleed sales and ad budget

Analytics only shows that a visitor left. It never reveals why they couldn't buy. These are the three silent technical failures behind dropped revenue.

🛒
Direct Sales Loss

The Broken Add-to-Cart Trap

Upsell and bundle apps attach JavaScript listeners that conflict with your theme. On mobile viewports or variant selects, clicks fail to update cart state.

Shopper intent:Ready to buy
Cart response:Silent 0-item fail
🎯
Wasted Ad Spend

The Meta & GA4 Pixel Blindspot

Advantage+ and PMax need immediate feedback on who purchased. When thank-you pages drop pixels or double-fire, algorithms bid higher for the wrong audience.

Ad optimization:Corrupted signals
Acquisition cost:+35% to +60% spike
⚡
Surge Traffic Drop

Silent 429 Throttles & Crashes

During paid ad spikes or flash sales, rapid calls to /cart/add.js trigger API rate limits that freeze the cart drawer with infinite spinners.

API status:429 Too Many Requests
User experience:Infinite loader

Find technical leaks before your next ad flight

Checkout Detective scans your live funnel and reports exact code lines and selectors.

Explore all 7 engines→
Diagnostic Architecture

7 specialized diagnostic engines

Built specifically for Shopify Liquid architecture and modern advertising attribution.

01Canonical Sequence
⚡

5-Stage Funnel State Machine

Monitors the authentic customer journey in sequence: Product View → Add to Cart → Cart Drawer/Page → Checkout → Purchase.

✓Distinguishes open drawers from hidden DOM elements
✓Tracks transition latency to DOM visual confirmation
✓Flags silent dropouts where state never advances
02ROAS Protection
♾️

Meta Pixel & Advantage+ Signal Auditor

Inspects live window.fbq calls to ensure Meta's ad bidding engine receives accurate conversion signals for every purchase.

✓Detects duplicate Pixel IDs causing double-counting
✓Audits ViewContent, AddToCart, InitiateCheckout, Purchase
✓Verifies currency, value, and content_ids match cart
03GA4 E-commerce
📊

Google Analytics 4 & GTM Event Verifier

Validates Google tag and dataLayer streams against standard GA4 schemas to maintain clean attribution.

✓Tracks view_item, add_to_cart, begin_checkout, purchase
✓Detects conflicting Measurement IDs or broken GTM containers
✓Guarantees campaign UTM parameters survive checkout redirects
04Click Attribution
💥

Action-Correlated JavaScript Error Watcher

Correlates console exceptions with the exact user interaction that caused them, eliminating developer guesswork.

✓Links uncaught exceptions directly to clicked button elements
✓Captures file origin and stack traces from app scripts
✓Flags high-risk blockers preventing checkout navigation
05Rate Limit Monitor
🌐

Real-Time AJAX & Network Pipeline Inspector

Intercepts and logs all asynchronous store requests with exact HTTP status codes, payloads, and response times.

✓Audits /cart/add.js, /cart/change.js, and checkout tokens
✓Detects 429 rate-limiting during high-volume ad spikes
✓Alerts on slow API responses (>1500ms) that freeze the UI
06Conflict Shield
🧩

Third-Party Vendor & Script Bloat Classifier

Scans and categorizes every third-party script loaded on your storefront into clear vendor domains.

✓Classifies analytics, live chat, reviews, and upsell apps
✓Pinpoints which scripts fail with 404/500 errors
✓Highlights dormant scripts firing unnecessary background requests
Engine 07 · Client & Dev Handoff

0–100 Health Score & 1-Click Bug Reports

Stop sending developers vague screenshots. Checkout Detective packages triggered rules, failed network calls, console stack traces, and verified pixel events into structured reports with 1 click.

HTML Diagnostic FileStandalone report ready to send directly to clients.
Markdown Bug TicketPre-formatted reproduction code for GitHub or Jira.
Funnel Health Score
94
Funnel healthy & ready for ads
Revenue Impact

How to recover sales & protect ad ROAS

Technical fixes directly improve conversion rates and advertising efficiency.

📈
Conversion Rate

Direct Sales Recovery

01. Eliminate silent Add-to-Cart crashes

Catches unhandled JavaScript exceptions and failed /cart/add.js calls in real time so you can remove or fix the conflicting app.

02. Unstick checkout button interceptions

Verifies button clickability, disabled attributes, and actual navigation to the Shopify checkout token URL.

03. Lower cart drawer latency

Tracks milliseconds for cart state mutations, exposing bloated scripts that freeze the page during high-intent moments.

Average sales recovery:+8% to +22%
🛡️
Attribution Protection

Ad Spend Protection (ROAS)

01. Stop blind Meta & GA4 model training

When a thank-you page fails to fire Purchase, ad networks assume the campaign failed and bids higher for the wrong users.

02. Eradicate double-firing duplicate pixels

Identifies duplicate Pixel IDs from third-party apps, preventing false ROAS data that causes you to scale losing campaigns.

03. Preserve campaign UTM continuity

Ensures campaign UTM parameters survive the redirect to checkout so ad managers receive 100% accurate attribution.

Average CPA reduction:-25% to -40%

The 60-second merchant audit workflow

01Before ad flightsVerify Meta & GA4 purchase pixels fire on order confirmation.
02After installing appsConfirm new upsell or chat apps haven't hijacked Add to Cart.
03Before flash salesCheck that rapid cart updates do not trigger 429 rate limits.
04Developer handoffExport the markdown bug ticket with reproduction code traces.

Diagnostic Capabilities

Everything You Need to Diagnose Checkout Issues

Six powerful diagnostic tools built into one lightweight Chrome extension.

Live Checkout Funnel Tracker

Monitor every step from Product View → Add to Cart → Cart View → Checkout → Purchase in real-time. Instantly see where customers drop off.

Meta & Google Pixel Verification

Verify that your Meta Pixel and Google Analytics 4 tags are firing correctly. Catch missing ViewContent, AddToCart, and Purchase events before they cost you ad spend.

JavaScript Error Correlation

Capture JS errors correlated with user actions. Know exactly which button click or page navigation triggered the error that's blocking your checkout.

Network Request Monitoring

Track failed API calls to /cart/add, /checkout, and payment gateways. Catch 429 rate limits during flash sales before your customers notice.

Third-Party Script Audit

Identify every third-party vendor loaded on your store — review apps, chat widgets, upsell tools — and spot the ones causing conflicts or slowdowns.

Health Score & Reports

Get an instant 0–100 health score for your checkout funnel. Export professional HTML or Markdown bug reports to share with your developer or ad agency.

Simple Workflow

Diagnose any store in 3 steps

No proxy setup. No code injection. Just open your storefront and click record.

01

Open Side Panel

Navigate to any Shopify store. Click the toolbar icon to launch Checkout Detective in Chrome's native Side Panel alongside your store.

Auto-detects Shopify theme & pixels
02

Record Live Journey

Click Start Investigation and browse naturally. View a product, click Add to Cart, open your drawer, and proceed to checkout.

Correlates clicks to errors live
03

Get Root-Cause Fixes

Stop the session to receive your 0–100 Health Score, pixel verification report, network status, and 1-click developer export.

Export HTML & Markdown tickets
Funnel Telemetry

5-Stage Sequential Funnel Tracker

Real-Time
Checkout Funnel Step-by-Step Visualization
Ad Signal Audit

Meta & Google Pixel Verification

Advantage+ / GA4
Pixel Tracking Verification Panel
Business Impact

Measurable financial returns

Estimated monthly revenue loss prevented across different store gross revenue scales.

Emerging
$25k / mo

Spending ~$5k/mo on Meta ads. Missing purchase events skew initial algorithm learning.

Protected revenue:+$1.7k – $3.2k / mo
Scaling DTC
$75k / mo

Multiple app installs cause cart button lag and 15% mobile dropoff on variant selects.

Protected revenue:+$5.2k – $9.8k / mo
Average
High Volume
$150k / mo

Heavy app stack. Duplicate pixel fires inflate reported ROAS while real conversion drops.

Protected revenue:+$12k – $21.5k / mo
Plus Brand
$500k+ / mo

Flash sales and traffic drops trigger 429 rate limits and currency mismatch dropouts.

Protected revenue:+$35k – $65k / mo
Detected IssueFinancial & Ad ImpactRule Code
Add to Cart button unresponsive on mobile20% to 40% of mobile sessions abandon with $0 cart valueCHK-002
Missing Meta Purchase pixel fireAdvantage+ algorithm flies blind; CPA rises +30% to +50%PIX-015
Duplicate Pixel IDs firing in parallelInflates reported ROAS 2x, tricking you into scaling losing adsPIX-011
JavaScript exception on checkout click100% of affected sessions fail to redirect; lost orderJS-035
429 Rate Limit on /cart/add.jsTraffic spikes fail silently with infinite loader; customers exitNET-028

Store Owners

Run 60-second health checks after installing apps or launching seasonal sales campaigns.

Shopify Agencies

Pre-flight audit client storefronts and export clean HTML reports proving zero checkout errors.

Media Buyers

Verify Meta Pixel, GA4, and GTM purchase tracking fires before turning on ad spend.

CRO Specialists

Uncover technical barriers that standard A/B testing tools miss with exact reproduction code.

Trusted by Shopify & ecommerce professionals

Join the thousands of merchants and agencies catching revenue leaks.

★★★★★

"Found a missing GA4 purchase event in 2 minutes that would have taken hours of manual debugging. The visual funnel tracking is incredible."

AM

Alex M.

Shopify Developer

★★★★★

"We updated our theme and our conversion rate tanked. Checkout Detective immediately pointed out a JS conflict with our review app blocking the checkout button. Saved us thousands."

SJ

Sarah J.

Store Owner

★★★★★

"I use this on every new client audit. The ability to export a clean markdown report of all the technical errors makes me look like a wizard to my clients."

DT

David T.

CRO Consultant

❓ Common Questions

Frequently Asked Questions

Everything you need to know about how Checkout Detective diagnoses stores, protects your data, and stops checkout dropouts.

Does Checkout Detective slow down my Shopify storefront for real customers?▼
No, absolutely not. Checkout Detective operates 100% as a client-side Chrome Extension inside your browser. It does not inject any tracking scripts, apps, or liquid code into your Shopify store's theme. Your real shoppers experience zero performance overhead or latency impact.
How does it stop Meta and Google ad spend waste?▼
Modern ad bidding (Meta Advantage+ and Google Performance Max) relies heavily on machine learning feedback signals. When your thank-you page fails to fire a Purchase event or double-fires duplicate pixels, the algorithm optimizes for the wrong users, driving your Customer Acquisition Cost (CAC) through the roof. Checkout Detective verifies pixel integrity across every funnel stage.
How is this different from Shopify Analytics or Google Analytics?▼
Standard analytics dashboards show you lagging metrics: 'Cart abandonment was 72%'. They cannot tell you why. Checkout Detective is a real-time diagnostic engine that reveals the technical root cause: e.g. 'Uncaught TypeError in bundle-app.js prevented the Checkout button click handler from navigating'.
Is customer data, credit card information, or passwords safe?▼
Yes. Checkout Detective features a dedicated, built-in Privacy & PII Sanitizer. It strips all credit cards, customer emails, telephone numbers, authorization bearer tokens, and session passwords in memory before diagnostics are evaluated. No sensitive data is ever stored, transmitted, or logged.
Can I use this to audit client stores if I am an agency or freelancer?▼
Yes! Checkout Detective is built specifically for Shopify agencies, conversion consultants, and developers. You can audit any Shopify storefront in 60 seconds and export a client-ready standalone HTML diagnostic report or copy a markdown bug ticket for GitHub, Jira, or Slack.
Does it work with modern Shopify themes like Dawn, Prestige, and Impulse?▼
Yes. It has built-in DOM heuristics for standard Shopify themes (Dawn, Prestige, Impulse, Sense, Warehouse) including drawer carts, modal popups, and standard cart page redirects, as well as custom and headless Shopify Plus storefronts.
Will Checkout Detective support WooCommerce stores?▼
Yes! WooCommerce support is actively in development. The same automated checkout state machine, AJAX network diagnostics (/wc-ajax= endpoints), and Meta / GA4 pixel verification will soon be available for WooCommerce store owners and agencies.
Free Forever · No Account Required

Start finding hidden checkout leaks today

Install the Chrome Extension, navigate to your store, and uncover your funnel health score in 60 seconds.

Add to Chrome — FreeView 60s Demo

Compatible with Google Chrome, Brave, Microsoft Edge, and Opera.