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Tech Stack Checker · free + API

See what any website is built with

Hosting, frameworks, analytics, payments, auth and more — for any site. The cheapest tech-detection on the market, wired to a directory of 20,000+ companies with funding and founder context.

20,000+ companies indexed Cheaper than BuiltWith API + monitors
stripe.com
5 of 18 shown
Vercel
Hosting
Next.js
Framework
Cloudflare
CDN
Segment
Analytics
Stripe
Payments
+13 more — unlock the full stack
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How we compare

BuiltWith and Wappalyzer tell you the tech. We tell you the tech and the company — funding, founders, profile — at a fraction of the price, with an API built for AI agents.

CapabilityStartupHubBuiltWithWappalyzer
Free instant web check
Pay-per-scan / credit pricing (no seat lock-in)
Cheapest per-lookup on the market
Company context — funding, founders, profile
Filter companies by the tech they use
REST API + MCP for AI agents
Monitor & alert on tech-stack changes
Pay-per-call with crypto (x402, no account)

full   partial / paid add-on   not offered. Comparison reflects publicly documented capabilities and is updated periodically.

What we detect

Hosting & CDN
Vercel, Cloudflare, AWS, Netlify, Fastly
Frameworks & CMS
Next.js, React, Webflow, WordPress
Analytics
GA4, Segment, Amplitude, PostHog
Payments
Stripe, Paddle, Lemon Squeezy
Auth
Auth0, Clerk, WorkOS, Supabase
Support & AI
Intercom, Zendesk, Fin, Sierra

Questions

How is this cheaper than BuiltWith?

BuiltWith sells seat-based subscriptions that run into the hundreds per month. We charge per scan in credits, so you only pay for the lookups you actually run — and stored results from our directory are effectively free to read.

Where does the data come from?

We detect technologies from a site’s public surface and enrich it with the company context already in our directory of 20,000+ startups (funding, founders, profile). Results you scan are cached so repeat reads are instant.

Can I scan a whole list of companies?

Yes — the API takes a domain per call (1 credit each) and is built for batch use. Sync it straight into Affinity, Airtable, Monday or your AI agent.

Can I monitor when a company changes its stack?

Yes — turn on a Monitor and we alert you (email, Slack, webhook) when a tracked company adds or drops a technology, or when new sites start using a tool you follow.