BuiltWith vs Wappalyzer vs DetectZeStack

If you need to detect what technologies a website uses, you've probably come across BuiltWith and Wappalyzer. They've been around for years and dominate the space. But they were built for a different era—one where $300+/month for API access was the only option.

DetectZeStack is a newer alternative built specifically for developers who need a fast, affordable tech detection API. In this post, we'll compare all three honestly—including where each tool excels and falls short.

Quick Comparison

BuiltWith: The Enterprise Standard

BuiltWith has been around since 2007 and has the largest technology database by far—over 111,000 signatures. It's the go-to choice for enterprise sales teams and market researchers who need historical data and lead lists.

Strengths

• Massive database: 111K+ technologies, including obscure plugins, widgets, and analytics tools that no other service tracks.
• Historical data: Technology usage history going back years. You can see when a site switched from Angular to React.
• Lead lists: Built-in tools for generating prospect lists filtered by technology (e.g., "all Shopify stores using Klaviyo").
• Market share reports: Aggregate statistics on technology adoption across millions of sites.

Weaknesses

• Price: Starts at $295/month. API access requires the Pro plan at $995/month. Enterprise pricing can exceed $4,000/month.
• Stale data: BuiltWith crawls sites periodically, not on demand. The data you get might be days or weeks old.
• No real-time analysis: You can't point it at a URL and get live results. It only reports what it found during its last crawl.
• Complex pricing: Different plans unlock different features, and it's not always clear what you're paying for until you sign up.

Wappalyzer: The Developer Favorite

Wappalyzer started as an open-source browser extension in 2009 and grew into a commercial product. It was acquired by Sindup in August 2023, and the open-source repository was archived. The technology fingerprints are now closed source.

Strengths

• Well-known brand: Most developers have used the browser extension at some point. Strong community awareness.
• Good accuracy: ~8,000 technology signatures, well-maintained and regularly updated.
• Browser extension: Free extension for Chrome/Firefox for one-off lookups.
• CRM integrations: HubSpot, Salesforce, and Pipedrive integrations for sales workflows.

Weaknesses

• Price: API access starts at $250/month (Starter). The Business plan with full API access is $450/month.
• No longer open source: The fingerprint database was closed after the Sindup acquisition. You can no longer contribute or self-host.
• Frontend-only detection: Wappalyzer analyzes HTTP headers and HTML. It doesn't inspect DNS records or TLS certificates, missing CDN and infrastructure detection.
• No CPE data: No mapping to vulnerability databases, limiting security use cases.
• Rate limits: Even paid plans have restrictive rate limits that can slow down bulk analysis.

DetectZeStack: The Developer-First API

DetectZeStack (that's us) was built from the ground up as a REST API for developers. No dashboards, no CRM plugins—just a fast, well-documented API that returns structured JSON.

Strengths

• Price: Free tier with 100 requests/month. Paid plans start at $9/month for 1,000 requests. Full API access at every tier.
• Multi-layer detection: Combines Wappalyzer-based fingerprinting with DNS CNAME analysis, TLS certificate inspection, and custom header matching. Catches infrastructure that HTTP-only tools miss.
• CPE identifiers: Detected technologies include CPE identifiers (when available) for mapping to the NVD vulnerability database.
• Stack comparison: The /compare endpoint shows shared and unique technologies across multiple sites—something neither BuiltWith nor Wappalyzer offers as an API.
• Webhook alerts: Get notified each time a monitored domain is analyzed. Useful for competitive monitoring and security tracking.
• Real-time analysis: Every request fetches and analyzes the target URL live. Results are cached for 24 hours, with cache status in response headers.

Weaknesses

• Smaller signature database: 7,200+ technologies vs BuiltWith's 111,000. We cover all major technologies, but may miss niche plugins.
• No historical data: We don't store historical snapshots (yet). You can use the /history endpoint to track changes going forward, but there's no backfill.
• No browser extension: API-only. No visual browser tool for quick lookups (though the live demo works for one-off tests).
• New product: Launched February 2026. Smaller user base than established competitors.

Pricing Breakdown

This is where the differences are starkest. To make API requests each month:

At 10,000 requests/month, DetectZeStack costs $29/month vs $995+ for BuiltWith and $450+ for Wappalyzer. That's a 15x-34x price difference.

The savings are real because DetectZeStack runs on minimal infrastructure (a single Fly.io VM with SQLite) instead of maintaining expensive crawl infrastructure and sales teams.

Detection Accuracy: A Practical Test

We ran all three tools against github.com to compare detection results:

All three tools catch the major frontend and backend technologies. DetectZeStack's DNS and TLS layers add infrastructure visibility that the others miss entirely. BuiltWith detects more niche technologies (analytics snippets, A/B testing tools, etc.) thanks to its larger database.

When to Use Which

Try It Yourself

The best way to evaluate is to test with your own URLs. Here's a quick comparison you can run right now:

curl -s "https://detectzestack.com/analyze?url=your-site.com" \
  -H "X-Api-Key: YOUR_KEY" | jq '.technologies[].name'

Compare the results against BuiltWith's free lookup and the Wappalyzer browser extension. For most developer use cases, you'll find DetectZeStack catches everything you need—plus infrastructure details the others miss—at a fraction of the cost.