Wappalyzer tells you exactly what technology any website runs — CMS, hosting, CDN, analytics, payment systems, and more. Essential for competitor research, outreach prospecting, and technical audits.
Wappalyzer is the best tool available for instant tech stack identification. The free extension is genuinely useful for day-to-day competitor and prospect research — click once and see CMS, hosting, CDN, analytics, and frameworks. Paid plans add bulk lookup and lead gen features that are valuable for agencies. For individual SEOs and developers, the free version is all you need.
Overall
4.3 / 5
Accuracy
4.6 / 5
Free value
4.5 / 5
Speed
4.7 / 5
What Wappalyzer Detects
Wappalyzer identifies over 1,500 web technologies across dozens of categories:
Competitor research: Instantly see what CMS, hosting, and analytics a competitor uses. Understand their technical stack to identify opportunities or vulnerabilities.
Link building prospecting: Identify WordPress sites for outreach campaigns, or filter prospects by specific technologies relevant to your client.
Technical audits: Verify that the correct analytics, tag manager, and CDN are firing on client sites. Spot conflicting or unexpected technologies.
Sales and agency prospecting: Identify potential clients running legacy or problematic tech stacks before pitching a migration.
Pros
Detects 1,500+ web technologies instantly
Chrome and Firefox supported
Very accurate for common technologies
Free tier covers all individual use cases
Fast — results appear as you load the page
Cons
May miss heavily obfuscated or custom implementations
Bulk lookup requires expensive paid plan ($149/month)
No SEO-specific metrics — complements, not replaces, SEO tools
Frequently Asked Questions
The extension is free and detects tech stacks on any site you visit. Paid plans ($149/month) add bulk lookup, lead gen lists, and API access — not needed for individual browsing and competitor research.
Very accurate for common technologies (WordPress, Shopify, Google Analytics, Cloudflare). May miss heavily obfuscated or custom implementations. For the top 100 most common web technologies, accuracy is high.