![Legacy Customer Accounts on Shopify [506K-Store Study]](/images/blog/legacy-customer-accounts-shopify.webp)
Legacy Customer Accounts on Shopify [506K-Store Study]
Shopify deprecated legacy customer accounts, but 40.9% of 506,321 classified stores still use them. We show where migration risk is highest.
Find out what Shopify apps any store is using in seconds. Free browser extensions, source code inspection, and more. Start spying on competitor stores today.

TL;DR: Use a free Shopify app detector like Store Inspector. Or check the page source and search for <!-- BEGIN app block: comments.
Want to see what apps a Shopify store is using? You can find out in seconds.
This guide shows you four free ways to detect Shopify apps on any store. Use these methods to spy on competitor stores and find what apps they use.
Here's why this matters for competitor research:
The average Shopify store uses 6+ apps. Our own State of Shopify data from 211K+ stores shows the average is closer to 1.8 detected frontend apps.
This is the fastest way to see what apps a Shopify store is using. Extensions scan the page and show you what's installed.
~5 seconds
Store Inspector is a free Shopify app detector that finds:
| Feature | What You Get |
|---|---|
| Apps | 72+ Shopify apps (reviews, upsells, email, analytics) |
| Pixels | 15+ tracking pixels (Meta, TikTok, Google, Klaviyo) |
| Themes | Free, paid, or custom themes |
| Traffic | Estimated traffic tier |
Install it. Visit any Shopify store. Click the icon. Done.
Pros:
Cons:
For a full comparison of every option, see our best Shopify app detector tools roundup.
| Tool | Price | Notes |
|---|---|---|
| Koala Inspector | $17-55/month | Popular, has free tier |
| Wappalyzer | Free/Paid | General tech detector |
| BuiltWith | $295+/month | For enterprises |
Don't want to install anything? Check the page source yourself to see what apps a store uses.
5-15 minutes
Ctrl+U / Cmd+Option+U)Ctrl+F / Cmd+F to searchApp block comments
<!-- BEGIN app block: shopify://apps/klaviyo -->
The app name comes after
/apps/. Replace dashes with spaces to find it in the Shopify App Store.
Script sources
<script src="https://cdn.judge.me/widget.js"></script>
<script src="https://static.klaviyo.com/onsite/js/klaviyo.js"></script>
Common domains
| Domain | App | Type |
|---|---|---|
judge.me | Judge.me | Reviews |
klaviyo | Klaviyo | |
stamped.io | Stamped | Reviews |
recharge | ReCharge | Subscriptions |
yotpo | Yotpo | Reviews |
privy | Privy | Popups |
loox | Loox | Photo Reviews |
omnisend | Omnisend | |
postscript | Postscript | SMS |
Pros:
Cons:
Want faster results? Try Store Inspector - it finds Shopify apps automatically in one click.
This catches apps that don't show up in the HTML. Good for finding hidden tracking pixels.
10-20 minutes
F12 to open DevTools| Type | What It Shows | Examples |
|---|---|---|
| Analytics | Tracking tools | Google Analytics, Triple Whale |
| Marketing | Email/SMS apps | Klaviyo, Postscript, Attentive |
| Reviews | Review widgets | Judge.me, Yotpo, Stamped |
| Support | Chat tools | Gorgias, Zendesk, Intercom |
| Testing | A/B test tools | Google Optimize, VWO |
Some apps load after the page loads. Network inspection catches these.
Pros:
Cons:
Websites that scan stores for you. No install needed.
2-5 minutes
Paste a Shopify store URL. The tool scans the site. You get a list of apps.
Pros:
Cons:
Most frontend apps can be detected:
| App Type | Why |
|---|---|
| Review apps | Load visible scripts |
| Email popups | Add JavaScript forms |
| Upsells | Modify the cart |
| Live chat | Load chat widgets |
| Analytics | Tracking scripts show up |
| Page builders | Leave code patterns |
Look at these categories when doing competitor research:
| Category | What It Shows | Popular Apps |
|---|---|---|
| Reviews | Focus on conversion | Judge.me, Yotpo, Loox |
| Email/SMS | Retention focus | Klaviyo, Omnisend, Postscript |
| Subscriptions | Recurring revenue | ReCharge, Skio, Bold |
| Upsells | AOV focus | ReConvert, Bold Upsell, Zipify |
| Analytics | Data-driven, ad spend | Triple Whale, Northbeam |
Stores using Klaviyo + ReCharge + Yotpo are usually doing 7-8 figures.
| Tip | Why | |
|---|---|---|
| 1 | Check 5-10 stores | One store isn't enough. Look for patterns. |
| 2 | Look at combinations | The mix of apps matters more than single apps. |
| 3 | Read reviews | Check the App Store before you install anything. |
| 4 | Start free | Most apps have free tiers. Test first. |
| 5 | Don't copy blindly | Use research for ideas, not blueprints. |
Focus on why stores use apps, not just what they use.
Can I see ALL apps a Shopify store uses?
No. Backend and private apps can't be detected. You'll find about 70-80% of apps.
Is it legal to see what apps a Shopify store is using?
Yes. You're viewing public information that's sent to your browser.
How often should I check competitor Shopify stores?
Every few months. App stacks don't change often.
What's the best Shopify app detector?
Browser extensions like Store Inspector. They're fast, accurate, and free.
| Method | Speed | Accuracy | Difficulty | Cost |
|---|---|---|---|---|
| Shopify App Detector Extension | Instant | High | Easy | Free |
| Source Code | 5-15 min | Medium | Easy | Free |
| Network Requests | 10-20 min | High | Medium | Free |
| Online Tools | 2-5 min | Low-Medium | Easy | Free/Paid |
Ready to see what apps any Shopify store is using?
Install Store Inspector - free, instant, detects apps + pixels + themes.
Search by niche, traffic, and tech stack. Export with verified founder contacts.Search stores by niche, traffic, and tech stack. Export with verified founder contacts so you can skip the research.
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