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Competitor Research Published 2026-10-20 - 5 min read By ShopThemeDetector Editorial Reverse-engineering successful competitors allows you to learn from their market testing and skip months of trial and error. 1. Uncover Their Theme and App Stack Enter their store URL into ShopThemeDetector.app. In under two seconds, you will see: The exact theme they run (even if customized). Every visible review, upsell, and email app they pay for. Their estimated monthly software spend. 2. Find Their Best-Selling Products Most Shopify stores leave their default collection sorting enabled. Add this parameter to any store domain: 
https://competitor.com/collections/all?sort_by=best-selling
Shopify's internal algorithm will automatically list their highest-volume sales items at the top of the collection grid! 3. Check Their Active Ad Creatives Visit the Meta Ad Library (Facebook and Instagram Ads) and search for the competitor's brand page name. You can see every live ad creative, video hook, copy angle, and landing page offer currently driving their sales. Start for free, keep building for R$ 5/month. Plus, earn up to US$ 5.000+ in credits as you sell. Test themes and launch your store today. Start Free Trial -> Guides How to Find What Shopify Theme a Website Is Using in 2026 (Step-by-Step) Learn the 3 easiest ways to find what Shopify theme any website is using: from automated detect... Advanced SEO How to Detect Renamed and Hidden Shopify Themes (Code Fingerprinting) Many high-earning Shopify stores rename their theme to hide their design secrets. Here is how c... Themes 10 Best Shopify Themes for High-Converting Ecommerce Stores in 2026 Discover the top 10 best Shopify themes in 2026 tested for mobile speed, checkout conversion, a...