BuiltWith vs Wappalyzer vs DetectZeStack

Short answer: BuiltWith ($295–$995/mo) is enterprise lead-gen with a massive historical database; Wappalyzer ($250+/mo) is a Chrome-extension-turned-SaaS focused on prospecting; DetectZeStack ($0–$79/mo) is the developer-first API alternative with batch detection, change tracking, and DNS/TLS fingerprinting. Pick BuiltWith for sales intelligence at scale, Wappalyzer for hybrid extension+API, DetectZeStack if you want REST API access at 30–100× lower cost.

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.

What's the difference between BuiltWith, Wappalyzer, and DetectZeStack?

BuiltWith is an enterprise tech-detection database ($295–$995/month) focused on lead-generation and market intelligence for sales teams. Wappalyzer is a browser extension and API ($149–$450/month) built on an open-source fingerprint library, popular with developers. DetectZeStack is a REST API ($0–$79/month) that uses the same Wappalyzer fingerprint database plus DNS CNAME, TLS certificate, and HTTP header detection—designed for developers who need programmatic access at low cost. All three detect technologies on websites; they differ on price, API access, and depth of historical data.

Which tech detection tool has the cheapest API?

DetectZeStack. The free tier is 100 requests per month with no credit card. Paid tiers start at $9/month for 1,000 requests, compared to Wappalyzer's $149/month minimum (Solo plan) and BuiltWith's $295/month entry-level. Per-request, DetectZeStack is roughly 110× cheaper than BuiltWith and 16× cheaper than Wappalyzer.

Which tool is best for finding companies that use a specific technology?

BuiltWith has the largest historical database (millions of domains, years of history) and the strongest reverse-lookup tooling—pay enterprise pricing if you need to export 100K Shopify stores for sales. DetectZeStack offers a reverse-lookup endpoint at /lookup?tech=X at $9–$79/month if you only need recent data. Wappalyzer's lead lists are mid-tier in coverage but cost $250+/month. Pick by data freshness, depth, and budget.

Can I switch from BuiltWith or Wappalyzer to DetectZeStack without code changes?

Mostly yes. Response formats differ—DetectZeStack returns a JSON object with technologies, categories, confidence scores, and CPE identifiers; BuiltWith and Wappalyzer use different schemas. You'll need to map response field names. The endpoints themselves are nearly equivalent: DetectZeStack /analyze?url=X is the analogue of Wappalyzer's /v2/lookup and BuiltWith's /v20/api. A typical migration is 30–90 minutes of client refactoring.

Quick Comparison

All values verified May 10 2026 from each vendor's pricing page, public technology catalog, and public API documentation. Citations in the "How we know" section below.

How we know — primary sources, captured May 10 2026: BuiltWith pricing & tech count from builtwith.com/plans; BuiltWith API list from api.builtwith.com; BuiltWith categories from trends.builtwith.com. Wappalyzer pricing from wappalyzer.com/pricing; tech catalog & detection-method statement from wappalyzer.com/technologies; "Website alerts" product from wappalyzer.com/alerts. DetectZeStack signature counts: wappalyzergo v0.2.79 embeds 7,524 fingerprints; production carries 185 active DNS-CNAME signatures (builtin + admin-added) and 8 TLS issuer signatures. Production hit-rates were measured against 8,933 historical tech_snapshots in the May 10 2026 backup: DNS layer fired on 626 (7%), TLS layer fired on 6,372 (71%).

BuiltWith: The Enterprise Standard

BuiltWith has been around since 2007 and tracks 113,816 technologies (per builtwith.com/plans, May 2026), with data from 414 million domains and 18+ years of usage history. It's the go-to choice for enterprise sales and market-research teams who need lead lists, historical data, or relationship graphs.

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: Plans run $295 (Basic) / $495 (Pro) / $995 (Team) per month per builtwith.com/plans. There's a free site-lookup interface (captcha-walled) and a free counts-only API; everything else is paywalled.
• Captcha-walled free lookups: The public per-domain pages (e.g. builtwith.com/stripe.com) require solving an image captcha, making programmatic comparison or quick reference difficult.
• Cached crawl data: BuiltWith crawls sites on its own schedule. Their per-domain pages show "last seen" dates, which can be days or weeks old depending on the domain's crawl tier.
• Complex feature gating: 9+ APIs (Domain, Change, Relationships, Lists, Live Feed, etc.) plus dozens of features tied to specific plan tiers; what you get at each price point isn't obvious without reading the full feature matrix.

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.
• Catalog size: 8,028 technologies across 106 categories per wappalyzer.com/technologies.
• Free browser extension: Chrome/Firefox extension for one-off manual lookups.
• CRM & lead-list workflow: Salesforce, HubSpot, and Pipedrive integrations; lead-list product across any combination of technologies.
• Website alerts: Their Website alerts product tracks technology changes on monitored domains.

Weaknesses

• Price & credit expiry: Pro starts at $250/month with 5,000 API credits; Business is $450/month with 20,000 credits. API credits expire after 60 days per wappalyzer.com/pricing.
• Lookup wall: The free per-domain lookup page requires signup; anonymous usage is gated to the browser extension.
• No longer open source: Original repo was archived after the August 2023 Sindup acquisition; the technology fingerprints are now closed source.
• HTML/header-focused detection: Per Wappalyzer's own description on wappalyzer.com/technologies, they detect via "HTML code, scripts, headers, cookies, and other fingerprints." Their public catalog has no DNS category, and their SSL/TLS certificate-authorities category lists only 7 CAs as technologies—not per-handshake fingerprinting.
• No CPE data: No public category for CPE-style vulnerability mapping.

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: Live demo gives 100 requests/month with no signup; RapidAPI free tier is also available without a credit card. Paid plans start at $9/month for 1,000 requests; full API at every tier.
• Per-tech detection-source attribution: Every technology in the response is tagged with how it was detected (HTTP fingerprinting, DNS records, TLS handshake, or certificate inspection)—useful when you're verifying a stack and want to know whether a tool was inferred from a script tag or confirmed via TLS.
• Multi-layer detection: 7,524 wappalyzergo HTTP fingerprints, plus 185 DZS-specific DNS CNAME signatures and 8 TLS issuer signatures, plus custom header matching. The DNS layer fires on roughly 7% of analyses (most often surfacing Fastly, Akamai, and managed-host CNAMEs like Framer, Webflow, Cloudflare Pages); the TLS layer fires on roughly 71%, returning the certificate issuer.
• 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 in a single API call.
• Webhook subscriptions: POST-back webhook deliveries on each analysis of a monitored domain.
• Change tracking: The /changes endpoint records every technology addition, removal, and version change. Free-tier retention is 7 days; paid tiers extend up to 365 days.
• Real-time analysis: Every request fetches and analyzes the target URL live, with 24-hour caching surfaced via response headers.

Weaknesses

• Smaller catalog than BuiltWith: 7,717 signatures vs. BuiltWith's 113,816 (per their respective sites, May 2026). We cover the mainstream stack — CDN, framework, hosting, analytics — but miss niche plugins that BuiltWith's larger crawl picks up.
• No browser extension: API-only product. The live demo works for one-off lookups but there's no Chrome/Firefox extension yet.
• No lead-list product: If you need "all Shopify stores using Klaviyo" prospect lists, BuiltWith and Wappalyzer's lead-list products are still the right tool.
• New product: Launched February 2026. Smaller user base than established competitors.

Pricing Breakdown

Lowest paid tier that includes any meaningful programmatic access:

At the BuiltWith Pro tier ($495/mo) and Wappalyzer Business tier ($450/mo), DetectZeStack's $29 Pro tier (10,000 requests/month) is roughly 15× cheaper than both. For a broader look at affordable options, see our roundup of free BuiltWith alternatives in 2026.

The price gap exists partly because DetectZeStack runs on minimal infrastructure (a single Fly.io VM + SQLite) and partly because we don't bundle the lead-list / market-research workflows that drive BuiltWith and Wappalyzer's enterprise pricing. If you need lead lists, those tools are the right fit.

Documented Detection Sources

The cleanest way to compare detection capability is to look at what each tool publicly catalogs as a detection category. Both Wappalyzer and BuiltWith publish their full category lists; we cross-checked them on May 10 2026.

How we know: Wappalyzer's category list (wappalyzer.com/technologies) groups 8,028 technologies across 106 categories. There is no DNS category and the SSL/TLS certificate-authorities group has 7 entries. BuiltWith's category list (trends.builtwith.com) includes "Name Server" and "SSL Certificates" as detection categories. Both companies' free tiers are walled — BuiltWith's per-domain pages render only after a JavaScript proof-of-work + image captcha, and Wappalyzer's lookup page requires signup. That makes side-by-side per-domain testing without paid access difficult; the table above compares what each tool publicly claims to detect rather than per-domain head-to-head detection counts.

The unique DZS angle is the per-tech detection source: every result you get back is tagged with whether it came from HTTP fingerprinting, DNS records, TLS handshake, or certificate inspection. That's useful when you're verifying a stack and want to know whether a tool was inferred from a script tag or confirmed via the TLS layer.

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.p.rapidapi.com/analyze?url=your-site.com" \
  -H "X-RapidAPI-Key: YOUR_KEY" \
  -H "X-RapidAPI-Host: detectzestack.p.rapidapi.com" | 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.