BuiltWith vs Wappalyzer vs StackPeek: Tech Stack Detection Pricing and Accuracy Compared (2026)

Knowing what technologies a website runs on is no longer a curiosity — it's a competitive advantage. Sales teams use tech stack data to qualify leads. Security auditors scan for outdated frameworks. Developers evaluate competitors before choosing their own stack. And marketers segment audiences by the tools they already use.

Three tools dominate the tech stack detection space: BuiltWith, Wappalyzer, and StackPeek. Each one takes a different approach to the same problem, and each one is built for a different audience. This guide compares them honestly — pricing, accuracy, speed, and use cases — so you can pick the right tool without overpaying.

Quick Comparison: BuiltWith vs Wappalyzer vs StackPeek

Why Comparing Tech Detection Tools Matters

Tech stack detection isn't a single problem — it's a spectrum. The tool you need depends entirely on what you're trying to do:

• Lead generation: Sales teams want lists of 50,000 sites running Shopify or HubSpot. They need massive databases and filtering, not fast APIs.
• Competitive intelligence: Product managers want to know what their competitor switched to last quarter. They need historical tracking.
• Security auditing: Penetration testers need to identify frameworks with known CVEs. They need accuracy and speed.
• Developer tooling: SaaS builders integrating tech detection into their own product need a fast, cheap, reliable API. Latency and cost-per-call matter most.

Choosing the wrong tool means either overpaying by hundreds of dollars a month, or getting data that doesn't fit your use case. Here's how each tool stacks up.

BuiltWith: The Enterprise Sales Intelligence Platform

BuiltWith is the oldest and most comprehensive player in this space. Founded in 2007, it has spent nearly two decades building the largest technology fingerprint database in the world — over 90,000 technologies tracked across hundreds of millions of websites.

What BuiltWith does best

• Lead lists: Search for "all sites using Marketo in the US with more than 10,000 monthly visitors" and get a downloadable CSV. This is BuiltWith's core value proposition.
• Historical data: See what technologies a website used in 2019 vs today. Invaluable for tracking technology migrations.
• Market share reports: Understand what percentage of the top 1M sites use React vs Vue vs Angular.

BuiltWith pricing

BuiltWith's plans start at $295/month for Basic and go up to $495/month for Pro. Enterprise pricing is available on request. There is no free API tier. The pricing reflects the product's positioning: BuiltWith is built for sales teams at mid-to-large companies, not individual developers.

At $295/month, you're paying for the dataset, not just the detection. If you need to generate lead lists filtered by technology, geography, traffic, and industry, BuiltWith is hard to beat. If you just need to check what framework a single URL runs, it's overkill.

Wappalyzer: The Browser Extension Everyone Knows

Wappalyzer is probably the most recognized name in tech detection, largely because of its free browser extension. Installed by millions of developers, the extension shows a site's tech stack right in the toolbar. It fingerprints over 1,500 technologies across 90+ categories.

What Wappalyzer does best

• Browser extension: The best in-browser experience for quickly checking any website's stack. Available on Chrome, Firefox, and Edge.
• Large fingerprint database: 1,500+ technologies with granular categorization, including specific WordPress plugins, Shopify themes, and niche JavaScript libraries.
• Broad ecosystem: CRM integrations, bulk lookup tools, and a company-facing product suite.

Wappalyzer pricing

Wappalyzer's API plans start at $149/month for API access and go up to $249/month for Pro with higher rate limits. The free tier is limited to 50 lookups per month — enough to test the API but not enough for production use.

Wappalyzer sits in the middle ground between BuiltWith's enterprise pricing and StackPeek's developer pricing. It's a solid choice if you need a large fingerprint database and are comfortable with the price, but the API is slower than lightweight alternatives because it relies on headless browser rendering to detect client-side technologies.

StackPeek: The API-First Developer Tool

StackPeek takes a different approach. Instead of trying to catalog every technology ever created, it focuses on the 120+ technologies that matter most — frameworks, CMSs, hosting providers, CDNs, analytics platforms, payment processors, and build tools — and delivers detection results via a lightweight REST API in under 500 milliseconds.

What StackPeek does best

• Speed: Sub-500ms responses because there's no headless browser. Detection is done via HTTP headers, HTML parsing, script fingerprinting, and meta tag analysis.
• Price: $9/month for 5,000 scans. That's 33x cheaper than BuiltWith and 16x cheaper than Wappalyzer for API access.
• Developer experience: Clean JSON responses, confidence scores, no API key required for the free tier (100 scans/day), and straightforward REST endpoints.

StackPeek pricing

StackPeek starts at $9/month for 5,000 scans (Starter) and $29/month for 25,000 scans (Pro). The free tier offers 100 scans per day with no API key required — enough for prototyping and small projects.

API Speed Comparison

If you're building tech detection into your own product, API latency matters. A 5-second API call means your users are staring at a loading spinner. Here's how the three tools compare in real-world response times:

BuiltWith and Wappalyzer use headless browsers to render the target page, which lets them detect client-side JavaScript libraries that only appear after execution. This is why they can identify more technologies. StackPeek skips the headless browser entirely, analyzing only the raw HTTP response — headers, HTML source, script tags, and meta tags. The tradeoff is a smaller fingerprint database, but dramatically faster responses and lower infrastructure costs (which is why the pricing is lower).

For most use cases — identifying the CMS, framework, hosting, CDN, and analytics — the raw HTTP response contains more than enough signal. You don't need to fully render a page to know it runs Next.js, is hosted on Vercel, and uses Google Analytics.

Detailed Pricing Breakdown

Here's where the difference really shows. Let's say you need 5,000 API lookups per month — a common volume for a small SaaS or internal tool:

At 5,000 lookups per month, StackPeek is 33x cheaper than BuiltWith and 16x cheaper than Wappalyzer. Even at 25,000 lookups on StackPeek's Pro plan ($29/mo), you're still paying a fraction of what the alternatives charge.

That said, pricing isn't everything. BuiltWith's $295/month includes access to lead lists, historical data, and market reports that StackPeek doesn't offer. You're comparing apples to oranges if your primary use case is sales prospecting. But if all you need is an API that returns a JSON array of detected technologies, the price gap is hard to ignore.

Accuracy Tradeoffs: An Honest Assessment

Let's be straightforward about accuracy. BuiltWith and Wappalyzer have larger fingerprint databases, and that translates to broader detection coverage:

• BuiltWith detects 90,000+ technologies, including obscure plugins, specific theme variants, and historical technology versions. If a technology exists, BuiltWith probably tracks it.
• Wappalyzer detects 1,500+ technologies with strong coverage of JavaScript frameworks, CMS plugins, and marketing tools. Its client-side rendering catches technologies that only appear after JavaScript execution.
• StackPeek detects 120+ technologies. It covers the core categories well — frameworks (React, Next.js, Vue, Angular, Nuxt, Svelte), CMSs (WordPress, Shopify, Squarespace, Wix), hosting (Vercel, Netlify, AWS, Cloudflare), analytics (GA4, Plausible, Hotjar), and payment processors (Stripe, PayPal). But it won't identify niche WordPress plugins or tell you which exact Tailwind version is running.

For roughly 90% of real-world use cases, 120+ technologies is enough. Most developers and product teams care about the big categories: What framework? What CMS? What hosting? What analytics? StackPeek covers all of those reliably. The remaining 10% — identifying specific plugin versions, obscure libraries, or sub-theme variants — is where BuiltWith and Wappalyzer earn their premium.

StackPeek's fingerprint database is also actively growing. We add new technology signatures weekly based on user requests and market trends.

When to Use Each Tool

Use BuiltWith if...

• You're a sales team building targeted lead lists based on technology usage
• You need historical data to track technology adoption over time
• You need market share reports for investor decks or strategy planning
• Your budget supports $295+/month and the ROI comes from closed deals

Use Wappalyzer if...

• You need a browser extension for quick in-browser tech stack checks
• You need to detect client-side JavaScript libraries that only appear after rendering
• You need a large fingerprint database (1,500+ technologies) and can afford $149+/month
• You need CRM integrations for enriching contact data with tech stack info

Use StackPeek if...

• You're a developer building a product that needs tech detection as a feature
• You need fast API responses (<500ms) without headless browser overhead
• You're cost-sensitive and 120+ technologies covers your use case
• You want a generous free tier (100 scans/day) for prototyping
• You're building competitive analysis tools, security scanners, or portfolio dashboards

Code Examples: StackPeek API

StackPeek's API is designed to be dead simple. No SDK required — just HTTP.

cURL

curl "https://stackpeek.web.app/api/v1/detect?url=https://stripe.com"

Node.js

const response = await fetch(
  "https://stackpeek.web.app/api/v1/detect?url=https://stripe.com"
);
const data = await response.json();

console.log(data.technologies);
// [{ name: "Next.js", category: "framework", confidence: 0.95 }, ...]

Python

import requests

response = requests.get(
    "https://stackpeek.web.app/api/v1/detect",
    params={"url": "https://stripe.com"}
)
data = response.json()

for tech in data["technologies"]:
    print(f"{tech['name']} ({tech['category']}) — {tech['confidence']}")

Example response:

{
  "url": "https://stripe.com",
  "technologies": [
    { "name": "Next.js", "category": "framework", "confidence": 0.95 },
    { "name": "React", "category": "framework", "confidence": 0.92 },
    { "name": "Cloudflare", "category": "cdn", "confidence": 0.98 },
    { "name": "Stripe", "category": "payment", "confidence": 0.99 },
    { "name": "Google Analytics", "category": "analytics", "confidence": 0.90 }
  ],
  "scanTime": 287
}

The Verdict

There's no single "best" tech stack detection tool — it depends on what you're building and what you can spend.

If you need massive datasets for sales prospecting, use BuiltWith. Its 90,000+ technology database and lead list features are unmatched. The $295/month price tag makes sense when each qualified lead is worth thousands in pipeline.

If you need a browser extension for quick checks, use Wappalyzer. It's the standard for in-browser tech detection, with a polished extension and a solid 1,500+ technology database. API pricing at $149/month is reasonable for teams that need deep detection.

If you need a fast, affordable API for developer tools, use StackPeek. At $9/month for 5,000 scans with sub-500ms responses, it's built for developers who want to integrate tech detection into their own products without breaking the budget. The 120+ technology database covers the core use cases, and the free tier is generous enough to prototype and ship without paying anything upfront.

The tech detection market has room for all three approaches. Pick the one that matches your use case and budget, and don't pay for capabilities you won't use.

Try StackPeek free →