18 Best Shopify Spy Tools

Your competitors are testing products, swapping themes, and burning ad budget in public, and most of that is visible if you know where to look. Spy tools do the looking for you. They surface what's actually selling on rival stores, which apps and themes those stores run, where their traffic comes from, and which ad creatives are live right now. This guide covers the 18 best Shopify spy tools for 2026, with honest notes on what each one does well and where it falls short.

What is a Shopify Spy Tool?

A Shopify spy tool is software that monitors competitor Shopify stores to surface best-selling products, pricing moves, app stacks, traffic sources, and ad creatives. Store owners use them to spot winning products before they peak, benchmark their own setup against competitors, and avoid repeating mistakes they can see others already making.

18 Best Shopify Spy Tools

Here is our list of the 18 best Shopify spy tools of 2026.

Rank	Spy Tool	Tool Features	Most Accurate For	Price
1	Koala Inspector	Analyze competitors' Shopify stores, revealing best-selling products and apps.	Shopify product sales, app, and theme detection	Free
2	Bigspy	Comprehensive ad spy tool for analyzing digital marketing campaigns.	Cross-platform ad campaign research	Free, $9/Month
3	Spyfu	Discover keywords and backlinks for SEO and PPC insights.	SEO/PPC keyword and backlink analysis	$39/month
4	Xpareto	Analytics platform for tracking competitor sales and store performance	Competitor sales and traffic performance	Free
5	PowerAdSpy	Facebook, Instagram, and Google ads spy tool for ad analysis.	Social media ad creative research	$49/month
6	Shopify Spy	Monitor Shopify store trends, products, and apps.	Product trends and niche research	Free
7	Builtwith	Website profiler to discover technologies and services.	Technology stack and e-commerce trend profiling	$295/month
8	Fera.AI Shopify App Detector	Reveal Shopify stores' app installations and usage trends.	App usage and installation tracking	Free
9	Koala Theme Detector	Discover which themes competitors are using.	Theme identification (high accuracy)	Free
10	PPSPY	Track products, pricing, and sales volume.	Real-time sales/revenue tracking (AI-powered)	Free, $5/Month
11	Trendtrack	Detect ecom store product trends and ad performance.	Ad and product trend tracking	$47/Month
12	Ali Hunter	Aliexpress and Shopify product hunter tool for discovering trending items.	Product source and best-seller tracking	Free, $19/Month
13	Ecomhunt	Find winning products for ecommerce based on sales trends	Winning/trending product identification	Free, $29/Month
14	SimilarWeb	Reveal website visits, sources, and performance metrics.	Traffic source and website performance analysis	Free, $199/Month
15	Shine Commerce Inspector	Sales and traffic analysis.	Revenue and trending product analytics	Free
16	Shopify Hunt	Find top products and trends.	Niche product and trend discovery	Free
17	Ahrefs	Analyze backlinks, keywords, and traffic.	Backlink and keyword research	$99/month
18	Semrush	All-in-one SEO and marketing tool for website analysis.	Comprehensive SEO and competitor audit	$119.95/month

1. Koala Inspector

We'll admit the bias upfront: Koala Inspector is our own tool. We built it because no single extension gave Shopify store owners a complete picture of what competitors were doing. It's now used by over 250,000 people and consistently ranks among the best Shopify spy Chrome extensions, with a free tier that covers real competitive research. Open any Shopify store and it pulls the data into your browser: installed apps, the theme, newest products, bestsellers, monthly traffic and its sources, ad campaigns, and a find-retailers feature. The point of having all of it in one panel is fewer open tabs and less manual digging, so you spend the time acting on what you find instead of collecting it.

Pricing

Koala Inspector has two subscription tiers plus optional one-time token packs.

• Free Plan $0/month (15 tokens/month).
• Premium Plan $22/month (220 tokens/month, tracking for up to 50 shops, VIP support).
• Token packs (one-time, never expire): 10 tokens for $3.99, 25 for $6.99, 100 for $11.99 (best value).

The Premium Plan also includes a 3-day free trial so you can test it before subscribing. Tokens are spent on premium features like CSV exports, Find Retailers, site traffic insights, ad campaigns, and Live Trends. Token packs stack on top of your monthly allotment and never expire.

Pros:

The free plan handles core competitive research without a subscription, so your budget goes toward growth rather than another tool. Because one panel covers theme detection, app detection, traffic, bestsellers, and ad campaigns, you're not stitching results together from four different services. Support runs around the clock if you get stuck.

2. BigSpy

BigSpy is built around ad intelligence. It pulls creatives from more than nine ad platforms, including Pinterest, TikTok, Instagram, and Facebook, so it's a fit if paid social is central to how you grow. The catch is that it stops at ads: it won't tell you which theme or apps a competitor runs, or how much traffic they get, so you'll likely pair it with something else for the full picture.

Pricing runs from a $9/month Basic plan (no ads analysis or top charts) up to the Pro plan at $1 for the first 3 days then $99/month, with an Enterprise tier at $3,600/year that adds multi-account seats and dedicated support for larger research teams.

3. SpyFu

SpyFu is a search tool, full stop: SEO and pay-per-click. It shows keyword rankings, competitor ad history, and backlink data going back years, which is more keyword-level depth than most tools here. Seeing which keywords a rival bids on and how long they've kept a specific ad live tells you what's converting for them, not just what they're testing. What it won't give you is product sales data, app detection, or Shopify-specific traffic breakdowns.

Pricing

• Basic: $39/month (up to 10k rows of results, 6 months of history)
• Professional: $79/month (unlimited results, 10+ years of history)

There's a full 30-day refund window, so trying it is low-risk.

4. Xpareto

Xpareto is free with no account required, which alone makes it worth a look before you pay for anything. It shows best-selling products from competitor stores and a quick read on sales volume, and because it's web-based it runs on any device, handy on a shared or managed machine where you can't install extensions. That web-only setup is also its limit: you can't inspect a store page while you're browsing it, and there's no real-time sales tracking or app/theme detection.

5. PowerAdSpy

Where PowerAdSpy stands out is filtering. You can search ads running across Facebook, Instagram, Google, and other platforms and narrow by keyword, country, niche, or engagement, which is more granular than most ad spy tools and beats scrolling an unfiltered feed of random creatives. Plans go from a free tier up through Basic at $24.50/month to Palladium at $174.50/month. The tier gap is the awkward part for solo owners: the free and Basic plans can feel thin, but the leap to Palladium is priced for agencies and hard to justify on a single store.

6. Shopify Spy

Shopify Spy is a product scraper and store analyzer that runs in Chrome and Edge. Its one job is exporting competitor product listings to CSV so you can sort and compare them in a spreadsheet, and it does that without demanding broad permissions. Treat it as an extraction tool rather than an all-in-one: it doesn't detect themes or apps, and it won't surface traffic or ad campaigns.

The free plan searches up to 100 products; Premium is $29/month or $199/year for expanded features.

7. BuiltWith

BuiltWith profiles websites across lead generation, market share, and sales intelligence. Its real strength is breadth of technology data: which e-commerce platform a site runs, which payment processors and analytics tools it has installed, with unlimited reports and CSV export. The global database makes it genuinely useful for benchmarking at scale, well beyond what Shopify-specific tools cover.

Pricing

• Free: Metrics on standalone e-commerce sites
• Basic: $295/month
• Pro: $495/month
• Team: $995/month, unlimited access for enterprise teams

The honest caveat is cost. Starting at $295/month, BuiltWith is priced for agencies and larger teams. It's hard to justify for a single Shopify store owner who mainly wants to know which apps or themes a competitor uses.

8. Shopify App Detector by Fera.ai

Fera.ai's app detector is a lightweight, free Chrome extension that reads which Shopify apps and themes a store is running, no account needed. Add it from the Chrome Web Store, visit a competitor's store, and it tells you what's powering the page right away, with no extra steps. App and theme detection is the whole feature set, though. For traffic, bestsellers, or ad campaigns you'll reach for something else.

9. Koala Shopify Theme Detector

The Koala Apps Shopify Theme Detector answers one question fast: which theme is that store running? Paste a competitor's URL and the theme name comes back in seconds, no sign-up, no jargon in the output. Use the web tool or the Chrome extension for one-click lookups while you browse. It's free with no paid tier, mostly because there's nothing else to sell you. If you need app, traffic, or sales data alongside the theme, pair it with a fuller tool.

10. PPSPY

PPSPY is free and focuses on product-level data: which products sell, at what price, in what volumes. Two things set it apart. It detects Facebook and TikTok ad pixels on a store, which most tools in this category skip, and that tells you something about a competitor's acquisition strategy before you've seen a single ad. It can also pull competitor product reviews directly, which saves time when you're testing similar products yourself. The limit is that it spots the pixels but won't show the actual ads running, so you'd still want BigSpy or similar for the creatives.

11. TrendTrack.io

TrendTrack.io tracks product performance across Shopify stores in real time, and its whole pitch is velocity. Instead of showing what sold last month, it combines sales volume, inventory changes, and pricing patterns to flag products with accelerating sales, giving you a window to move before a niche gets crowded. Watching acceleration rather than raw volume is what separates a genuine trend from a one-time spike, and monitoring thousands of stores gives you the market-wide read to tell them apart. What it won't do is detect a competitor's theme or apps; it's product data only.

Pricing

• Starter: $59/month, basic trend tracking
• Professional: $89/month, advanced analytics
• Business: $149/month, API access and custom alerts
• 20% off on annual plans

That $59 Starter price is a real commitment to make before you've confirmed the data fits your niche, so the trend coverage needs to matter to you specifically.

12. Ali Hunter

Ali Hunter joins AliExpress and Shopify product research in one place. You can see what competitors sell, trace a product back to its AliExpress source in a single click, and check the supplier's rating before you commit. The one-click sourcing trace cuts hours off product research, and the built-in credibility scores help you avoid unreliable suppliers before you start selling.

The 7-day trial gives you a taste, but there's no permanent free tier, and on a tight budget the $19/month starting price adds up.

Pricing

• Free Trial: 7 days for first-time users
• Startup: $19/month
• Growing: $29/month
• Professional: $49/month
• Enterprise: $99/month

13. Ecomhunt

Ecomhunt is less a traditional spy tool and more a curated product-discovery feed, and it's free for the core features. Each winning product it lists comes paired with Facebook ad examples, analytics, and AliExpress links, so you get a research starting point rather than a raw data dump, and the Chrome extension lets you inspect competitor stores too. The trade-off of hand-curation is timing: products are added manually each day rather than surfaced by an algorithm, so there are coverage gaps and the freshest opportunities may not show up right away.

14. SimilarWeb

SimilarWeb is a digital-intelligence platform built around web traffic, audience demographics, and online behavior. For any site, Shopify stores included, it breaks visitors into referral, organic, paid, social, and direct, which is the clearest way to see where a competitor's traffic actually comes from. Add the global and industry rankings and you can judge your store's standing in context instead of in isolation. The free version is surface-level only; the data that matters sits behind Premium at $199/month. And it's a traffic tool, so don't expect product-level numbers, bestsellers, or app-stack detection from it.

15. Shine!

Shine! looks at the demand side rather than the tech side. It aggregates customer reviews, social mentions, and product ratings across platforms to show how shoppers actually feel about competitor products and whether their marketing is landing. At $29/month it's reasonable for a smaller store, the sentiment data is real-time, and the interface keeps things easy to act on. The flip side of that narrow focus: it tells you how customers feel after they buy, not how competitors got them there, so there's no sales, traffic, or app-stack data here.

16. ShopifyHunt

ShopifyHunt is for catalog expansion. It helps you find and track popular products across Shopify, which suits dropshippers looking to add items that are already selling in their niche. The basic product insights are free and the interface has a short learning curve, with a Premium tier from $69/month that adds competitor tracking and deeper product analysis. Two limits worth flagging: real competitor analysis sits behind that paid plan, and the whole tool stays product-focused, so don't look to it for traffic or app data.

17. Ahrefs

Ahrefs isn't a dedicated Shopify spy tool, but for organic search it outclasses everything else on this list. It shows which keywords competitors rank for, what their backlink profile looks like, and where the content gaps sit. The keyword-gap view is the standout: it hands you a clear list of terms rivals rank for and you don't, which doubles as a content or PPC roadmap, and the backlink monitoring shows exactly where competitors earn their links.

Pricing

• Lite: from $99/month
• Standard: from $199/month
• Advanced: from $399/month
• Enterprise: from $999/month

Two caveats. That $99/month entry is a serious commitment if you're not already investing in organic search, and being SEO-first means no product sales data, app-stack detection, or ad creatives.

18. SEMRush

SEMrush is the broadest tool here: keyword research, competitor analysis, backlink tracking, and paid-search data in one platform. If you run a mixed SEO and Google Ads strategy, covering both organic and paid in a single place is the draw, and it's strong at showing how rivals position themselves in search and where the gaps are.

Pricing:

• Pro: $108.33/month
• Guru: $208.33/month
• Business: $416.66/month

The downsides are real for a single store. It's priced for marketing teams and agencies, the breadth means a steep learning curve before you know which reports matter for Shopify, and there are no Shopify-specific features: no product sales data, no app-stack detection. It's a search-intelligence tool that happens to help with Shopify SEO.