How to Play Detective: Uncovering Competitor Sites and Their Suppliers


Hey everyone, this is Neo from the indie e-commerce world.

In all my years running indie e-commerce sites, the question I get asked most — after “how do I do SEO” — is definitely this: “Neo, I found a competitor’s site that’s selling like crazy, but I can’t figure out what exactly they’re selling or where they source it. What do I do?”

Every time I hear this, I smile. It’s so familiar! Back when I was starting out, I’d stare at those successful competitor sites every day, itching like a cat watching a bird. Their site design, product pricing, winning-product strategies — even which payment gateway they used — I wanted to dig it all up.

Here’s the thing: none of it is really a secret. In the transparent battlefield of e-commerce, once you know the right methods, every competitor is basically wearing the emperor’s new clothes in front of you.

Today, I’m putting on my veteran’s hat to take you on a ride as an “e-commerce detective” — how to quickly find your competitors’ sites, then follow the trail to uncover the “ace supplier” behind them.

Ready? Let’s hit the road!

Part 1: Lock Onto Competitor Sites Like the FBI

Know yourself and know your enemy, and you’ll never lose a battle. Before hunting suppliers, we need to pinpoint the “enemy” precisely. Stop just throwing broad product keywords into Google — that’s way too inefficient. Try these tricks:

Trick 1: Google Advanced Search Operators

This is basic stuff, but 90% of people don’t use it well. Open Google, forget plain keywords, and try these:

  1. inurl: operator: Precisely targets sites with a specific URL pattern.

    • Formula: inurl:shopify "your product keyword"
    • In practice: Want to find Shopify stores selling crystal lamps? Search inurl:shopify "crystal lamp". Almost every result will be a Shopify indie store selling crystal lamps. Very precise.
  2. intitle: operator: Finds sites with your keyword in the title.

    • Formula: intitle:"your product keyword"
    • In practice: Search intitle:"bamboo cutting board" and every result’s title contains “bamboo cutting board” — those are your direct competitors.
  3. The combo (most used):

    • Formula: "product keyword" + "free shipping" or "product keyword" + "track order"
    • In practice: Search "meditation cushion" + "free shipping". Why? Because nearly every indie store has “free shipping” and “track order” on their site. This combo filters out content farms, blogs, and news sites, giving you much cleaner results.

Neo’s tip: Definitely use a VPN and switch your node to your target market (e.g., the US or Germany) — otherwise you won’t be seeing your real local competitors!

Trick 2: “Peek” Through Social Media Ad Libraries

If Google search is going on the offensive, ad libraries are playing the waiting game. Wherever competitors spend money, that’s where they show up.

  • Facebook Ad Library: This is a goldmine! Filter by keyword and country/region and you can see every relevant ad currently running. Spot an interesting one, click in, and there’s the competitor’s site. I regularly lose half an afternoon scrolling it — it’s great for spotting emerging winners.
  • TikTok Creative Center: Same playbook. Head to “Top Ads”, filter by your industry and country, and see which product videos are popping lately. This finds you competitors AND gives you ad creative inspiration at the same time.

Trick 3: Turn On “Radar Mode” with Tools

Once you have one or two target competitors, bring out the pro tools.

  • Similarweb: The go-to tool for site traffic. Enter a competitor’s URL, find “Competitors & Similar Sites” in the report, and you’ll instantly get a high-quality list of comparable sites.
  • Ahrefs / SEMrush: These are the SEO pros’ weapons. Use them to analyze which keywords drive a competitor’s traffic and which pages perform best. Follow those keywords and you’ll uncover even more potential competitors.

Part 2: Follow the Trail — Dig Up Their “Hidden Suppliers”

Found the sites. Now for the exciting part. How do I dig out their suppliers?

Skill 1: Reverse Image Search with the AliPrice Extension

This is my most-used and most effective trick. Promise me — if you’re in cross-border e-commerce, install this browser extension right now!

On any site, hover over a product image and a “search” icon appears in the top-left corner. Click it, and it automatically finds the same product across a bunch of major platforms (Alibaba, 1688, AliExpress, eBay, Shopee, etc.). Who’s the source, what’s the price — all clear at a glance. 10x more efficient!

Skill 2: Dig Through the Site’s “Trail of Clues”

If image search comes up empty, don’t lose heart — look for clues on the site itself.

  • Check product descriptions: Many careless sellers copy the supplier’s product model numbers (SKUs) or unique descriptive phrases straight onto their site. Copy those model numbers or unique phrases and search them on Google or Alibaba — you’ll usually find a surprise.
  • Check the return address: Visit the site’s “Return Policy” page. Sometimes the return address reveals their overseas warehouse or third-party logistics provider (like CJDropshipping).
  • Check unboxing reviews: Search YouTube for “product name + unboxing” or “brand name + review”. Watch those foreign unboxing videos — sometimes the packaging prints the manufacturer’s info, or you can tell where it shipped from.

Skill 3: Play Customer and “Fish” for Answers

This one’s a bit of a wild move, but it works wonders sometimes.

  • As a regular customer: Through live chat or email, ask product questions like “Where is this product made?” or “Is this your own brand?” and see how support answers.
  • As a “big” buyer: Send an email pretending to be a distributor wanting bulk orders, and ask about wholesale pricing. If they manufacture via their own factory, they might decline politely. But if they’re just a middleman, they might let their upstream slip.

Neo’s Final Word

Alright, I’ve handed you all the methods for digging into competitor sites and suppliers.

But here’s the most important thing I want to say: we do all this not to copy them 100%, and definitely not to fight a price war.

Finding a competitor’s supplier is for:

  • Inspiring your product selection: So that’s the kind of product you can sell in this niche!
  • Optimizing your supply chain: See if you can find suppliers with lower costs or better quality.
  • Thinking about differentiation: Competitor sells at $100 — can you find a source at $80? Or can you, at the same cost, offer better packaging, faster shipping, or more attentive service, and sell at $120?

The market is transparent and information is open. What truly sets you apart in fierce competition is never the “secret supplier” you found — it’s how much unique customer value you create on top of it.

Hope today’s share helps you.

This is Neo — see you in the next one.