BuiltWith vs Wappalyzer: Feature-by-Feature Comparison (2026)

BuiltWith and Wappalyzer are the two most well-known tools for detecting what technologies a website uses. Both have been around for over a decade, but they take very different approaches—and come with very different price tags.

This guide compares them head-to-head on pricing, detection accuracy, API access, technology coverage, and use cases so you can pick the right one for your workflow.

What Each Tool Does

BuiltWith (founded 2007) is an enterprise-grade technology profiling platform. It periodically crawls hundreds of millions of websites and maintains a massive database of technology usage, historical data, and lead lists. It's primarily used by sales teams and market researchers.

Wappalyzer (founded 2009) started as an open-source browser extension for identifying technologies on websites. It was acquired by Sindup in August 2023 and the open-source repository was archived. Today it offers a commercial API alongside the free browser extension.

Pricing Comparison

Pricing is where the two tools diverge significantly.

BuiltWith is the more expensive option at every tier. Its entry-level plan starts at $295/month, but that doesn't include API access. To make programmatic requests, you need the Pro plan at $995/month.

Wappalyzer is cheaper for API access, starting at $250/month for the Starter plan. The Business plan at $450/month includes higher rate limits and additional features. The free browser extension is useful for occasional manual lookups but doesn't provide API access.

Feature-by-Feature Comparison

Detection Accuracy

Both tools are capable detectors, but they work in fundamentally different ways.

BuiltWith: Breadth Through Crawling

BuiltWith maintains approximately 111,000 technology signatures—the largest database of any tech detection tool. It identifies everything from major frameworks to obscure analytics snippets, ad networks, and A/B testing widgets.

The trade-off is freshness. BuiltWith crawls websites periodically rather than analyzing them on demand. The data you get back might be days or weeks old. If a site recently switched from React to Vue, BuiltWith may not reflect that change until its next crawl.

Wappalyzer: Accuracy Through Real-Time Analysis

Wappalyzer has approximately 6,000 technology signatures—far fewer than BuiltWith, but focused on the technologies developers actually care about. It analyzes websites in real time by inspecting HTTP response headers, HTML source, JavaScript variables, and DOM patterns.

This real-time approach means Wappalyzer always reflects the current state of a website. However, its detection is limited to what's visible in the HTTP response and rendered page. It doesn't inspect DNS records, TLS certificates, or server-side infrastructure.

API Access

If you're a developer building an integration, API access is likely your top concern.

BuiltWith gates API access behind its Pro plan at $995/month. The API returns comprehensive data including technology categories, spend profiles, and historical usage. However, the data is crawl-based rather than real-time.

Wappalyzer offers API access starting at $250/month on the Starter plan. The API performs real-time lookups and returns structured technology data. The Business plan at $450/month includes higher rate limits. Both plans have request caps that can be restrictive for bulk analysis.

Neither tool offers a free API tier. BuiltWith has a limited free lookup on its website, and Wappalyzer's free browser extension doesn't provide programmatic access.

When to Choose BuiltWith

• You need historical data: BuiltWith's years of crawl history let you see when sites adopted or dropped technologies.
• You need lead lists: Filter millions of websites by technology stack to build prospect lists (e.g., "all Shopify stores using Klaviyo").
• You need market share reports: Aggregate adoption data across the web for competitive analysis or investor presentations.
• You have enterprise budget: At $295-$995/month, BuiltWith is positioned for teams where tool costs are a rounding error.

When to Choose Wappalyzer

• You need real-time detection: Wappalyzer analyzes sites on demand, giving you the current state rather than cached data.
• You want a browser extension: The free Chrome/Firefox extension is the easiest way to check a site's tech stack manually.
• You need CRM integrations: Built-in HubSpot, Salesforce, and Pipedrive connectors for enriching leads with technology data.
• You value the open-source heritage: Wappalyzer's fingerprinting patterns were community-built. The technology categorization is well-structured and battle-tested.

Or Try DetectZeStack

If neither BuiltWith nor Wappalyzer fits your budget or use case, DetectZeStack is a third option worth considering.

DetectZeStack is an API-first tech detection tool built for developers. It combines HTTP/HTML fingerprinting with DNS and TLS analysis to detect infrastructure that header-only tools miss—like CDN providers (via CNAME records) and certificate authorities (via TLS inspection).

Key differences from BuiltWith and Wappalyzer:

• Free tier: 100 API requests/month, no credit card required.
• Paid plans from $9/month: Full API access at every tier. No $250/month minimum to start making API calls.
• DNS/TLS detection: Identifies CDNs, hosting providers, and certificate authorities that neither BuiltWith nor Wappalyzer detect.
• CPE identifiers: Detected technologies include CPE identifiers (when available) for mapping to the NVD vulnerability database—useful for security teams.
• Real-time analysis: Every request analyzes the target URL live, with results cached for 24 hours.

The trade-off: DetectZeStack has a smaller signature database than both BuiltWith and Wappalyzer, no historical data, no browser extension, and no CRM integrations. It's a developer API, not a sales platform.

Read the full three-way comparison: BuiltWith vs Wappalyzer vs DetectZeStack.

Verdict

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• BuiltWith vs Wappalyzer vs DetectZeStack — Full three-way comparison
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• WhatRuns Alternative — Compare DetectZeStack to WhatRuns