How to Use Browser Extensions for Ecommerce Competitive Research

Extensions are most useful in competitive research when you use them in a set order and write down what you find. Here's a simple process for studying an online competitor in about an hour, using free tools.

Step 1: pick three to five competitors

Choose stores that sell to the same customers as you, not just the biggest names. Search for your main products the way a customer would and note who shows up, both in ads and in regular results. Set up a spreadsheet with a row per competitor.

Step 2: see what they're built on

• On Shopify stores, Shopify Theme Detector shows the theme and installed apps. Apps tell you a lot: which review platform, upsell tool, subscription app or loyalty program they use.
• For any platform, Wappalyzer or BuiltWith list the technology: analytics, payment providers, email and chat tools.

Step 3: map the catalog and best sellers

On many Shopify stores, /collections/all lists every product, and adding ?sort_by=best-selling sorts them by sales. It's a quick look at what moves. Note product counts, price ranges and which items they push on the homepage.

On Etsy, Etsy Keyword Extractor copies the tags from a competitor's listings so you can see which searches they target.

Step 4: track prices

Record prices for five to ten comparable products and check them weekly. On Amazon, Keepa and The Camelizer show price history. Watch for sales patterns, free-shipping thresholds and bundles.

Step 5: read their reviews

Reviews are free customer research. Look for repeated complaints (shipping times, sizing, quality) that you can do better on, and the phrases happy customers use, which make good ad and product copy.

Step 6: look at their ads

The Meta Ad Library and the Google Ads Transparency Center show the ads a company is running. Ads that have been live for months are probably working. Note offers, angles and formats.

Step 7: estimate traffic

The Similarweb extension estimates visits and traffic sources. Treat it as a rough comparison between competitors, especially for small stores.

Turning research into action

• List what every competitor does (that's the baseline you must match).
• List what none of them do well (that's your opening).
• Repeat the price and ad checks monthly.

For more tools, see the best extensions for ecommerce competitive research. Keep research to learning: copying photos, descriptions or brand assets can break copyright and marketplace rules.