Free Tool

Website Technology Checker

Find out what technology any website uses. Detect frameworks, CMS, hosting, analytics, payments, and more. Instant results, no signup required.

100 free scans per day — no API key needed
How It Works

Three steps, under 500ms

StackPeek uses a lightweight detection pipeline — no headless browser, no slow rendering. Just fast, accurate technology identification.

01

Enter a URL

Paste any website URL into the input above. We accept any publicly accessible page — homepages, subpages, web apps.

02

We scan everything

Our engine analyzes HTTP headers, HTML source, script fingerprints, meta tags, and DNS records to identify technologies.

03

Get structured JSON

Results come back as categorized JSON with confidence scores. Use them in your app, CRM, or export to a spreadsheet.

Detection Categories

What we detect

StackPeek identifies 120+ technologies across 15 categories. From React to Stripe, WordPress to Cloudflare — we cover the technologies that matter for lead generation, competitive analysis, and sales intelligence.

Frameworks
CMS
Hosting
CDN
Analytics
Payments
Auth
Fonts
Build Tools
Monitoring
Security
Email
A/B Testing
Search
Chat
For Developers

Website technology checker API

Everything on this page is powered by the StackPeek REST API. One endpoint, JSON response, sub-500ms latency. Integrate tech stack detection into your product in minutes.

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

Response:

{ "url": "https://stripe.com", "technologies": [ { "name": "Next.js", "category": "framework", "confidence": 0.95 }, { "name": "Cloudflare", "category": "cdn", "confidence": 0.99 }, { "name": "Stripe", "category": "payments", "confidence": 0.97 }, { "name": "Google Analytics", "category": "analytics", "confidence": 0.91 } ], "scanTime": 312 }

No SDK needed. No client library to install. Any language with HTTP support works. Read the full API docs.

Pricing: StackPeek vs alternatives

Feature StackPeek Wappalyzer BuiltWith
Free tier 100/day (3,000/mo) 50/month None
Paid API $9/mo (5K scans) $250/mo $295/mo
Response time <500ms 2–5s 3–10s
Auth required No (free tier) Yes Yes
Technologies 120+ 1,500+ 3,000+

Need more than 100 scans/day?

Upgrade from $9/mo for 5,000 scans, faster rate limits, and priority support.

See pricing →
FAQ

Frequently asked questions

How accurate is the website technology checker?
StackPeek detects 120+ technologies across 15 categories with 88–95% accuracy depending on the category. We analyze HTTP headers, HTML source, script fingerprints, and meta tags. Detection accuracy is highest for frameworks (94%), CMS platforms (92%), and hosting providers (91%).
Is this tool really free?
Yes. The free tier includes 100 scans per day (3,000 per month) with no API key and no signup required. For higher volumes, paid plans start at $9/month for 5,000 scans.
How fast are the scan results?
StackPeek returns results in under 500ms on average, often under 300ms. We use a lightweight detection pipeline instead of a headless browser, which makes scans significantly faster than alternatives like Wappalyzer (2–5 seconds).
What technologies can StackPeek detect?
StackPeek detects technologies across 15 categories: Frameworks (React, Next.js, Vue, Angular, Svelte), CMS (WordPress, Shopify, Squarespace), Hosting (Vercel, Netlify, AWS), CDN, Analytics, Payments (Stripe, PayPal), Auth, Fonts, Build Tools, Monitoring, Security, Email, A/B Testing, Search, and Chat widgets.
How does StackPeek compare to Wappalyzer and BuiltWith?
StackPeek is 28x cheaper than Wappalyzer ($9/mo vs $250/mo) and 5–10x faster. Wappalyzer detects more niche technologies (1,500+) but StackPeek covers the 120+ technologies that matter most. BuiltWith starts at $295/mo. StackPeek's free tier is far more generous than both.

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