CrawlwiseData
Free tools

Free website tech stack lookup

Paste a public URL. Crawlwise detects the CMS, frameworks, analytics, CDN, server, and DNS/email providers — same production /v1/techstack endpoint used by the API. No key required (demo quota applies). Want alerts when a competitor’s stack changes? Get a free trial key and create a signed webhook monitor.

Look up a site

Uses the free demo: 20 calls per day per IP, no monitors. Attempts count toward the limit even when they fail. We respect robots.txt and block private networks.

API docs →

Prefer curl? curl -G https://crawlwisedata.com/v1/techstack -d url=wordpress.org

GET /v1/techstack?url=wordpress.org

Enter a URL and press Detect. Results appear here as category cards, plus raw JSON.

From lookup to change alerts

Don’t just look once — get a webhook when tech changes

This free tool is a one-shot demo. With a free trial key (1,000 credits) you can create a techstack monitor: Crawlwise checks on a schedule and POSTs a signed event when the stack shifts. You pay for changes, not empty checks.

1. Free trial key

1,000 one-time credits, no card. Full result sizes and monitors. One per email every 30 days; per network up to 5 requests an hour and 10 a day.

2. Create a monitor

POST /v1/monitors with endpoint: "techstack", a name, target URL, and https webhookUrl.

3. Verify signatures

Every change POST is HMAC-signed (X-Crawlwise-Signature). See the monitors howto.

Get a free trial key

1,000 free credits, one time (about 33 tech-stack lookups or 100 feed reads). No card. One key per email every 30 days; per network up to 5 requests an hour and 10 a day. We never email you.

Trial limits: 20 requests/min, 5 monitors. If a call costs more than your balance, it's refused and you're charged nothing. Disposable email addresses are refused. We keep only a salted hash of your email (Privacy). Agents: POST /v1/trial with {"email": "…", "acceptTerms": true} (or accept later with POST /v1/terms/accept).

Also free: sitemap & feed checker · homepage demo · pricing

FAQ

About this free tech stack tool

Is this the real Crawlwise API?

Yes. The form calls same-origin GET /v1/techstack in demo mode (no API key). Same fingerprints, robots handling, and SSRF protections as keyed calls.

What are the limits?

10 demo calls per day per IP (also network and global caps). Demo mode has no monitors. For continuous watching, use a trial key or pack/plan.

Can I automate this?

Yes — with a key. Import OpenAPI, use llms.txt, or the local crawlwise-mcp package. Agents: POST /v1/trial then call /v1/techstack.

Do you respect robots.txt?

Always. Disallowed targets return robots_disallowed and are not charged. Details for site owners: CrawlwiseBot.