Is there a free tier?

Yes. 100 API requests per month with no credit card required. The free tier includes all 14 endpoints.

How does pricing compare to BuiltWith and Wappalyzer?

BuiltWith's API access starts at $995/month on their Pro plan. Wappalyzer's API requires the Team plan at $450/month. DetectZeStack starts at $9/month with full API access on every paid tier.

What happens if I exceed my monthly quota?

Requests beyond your tier's monthly cap return HTTP 429. Upgrade in one click from your dashboard at any time.

Pricing — DetectZeStack Tech Stack Detection API

Name: DetectZeStack — Tech Stack Detection API
Brand: DetectZeStack

Pro

$9 / month

1,000 requests / month

All 14 API endpoints
Stack detection & vulnerability scan
5 tech change alerts · daily checks · email
DNS intelligence & security headers
SSL certificate inspection
Email support

Ultra

$29 / month

10,000 requests / month

Everything in Pro
25 tech change alerts · daily checks · email + Slack (setup guide)
Higher rate limits
Batch endpoints (analyze/compare)
Priority support
SLA: 99.9% uptime

Mega

$79 / month

50,000 requests / month

Everything in Ultra
125 tech change alerts · daily checks · email + Slack (setup guide)
Highest volume tier
Priority queue routing
Direct Slack channel for support
Custom integrations on request

Just want to try it? Free tier includes 100 requests/month. Sign up — no credit card required.

Pricing FAQ

What counts as a request?

Every successful API call counts as one request. Cached responses (within the cache TTL) do not count. Failed requests (4xx/5xx) do not count.

What happens if I exceed my quota?

You'll receive a 429 response. Quotas reset at the start of each calendar month. Upgrade anytime from your dashboard.

Can I cancel anytime?

Yes. Cancel from your dashboard via the Stripe Customer Portal. You keep access until the end of your billing period, then drop to the free tier.

Do you offer refunds?

Refunds are handled manually — email [email protected] within 14 days of charge for a full refund. See Terms for details.

Do you charge sales tax?

Tax is calculated by Stripe at checkout based on your billing address and our state nexus. Most customers see no added tax.

Is this a WhatRuns alternative?

Yes — and unlike WhatRuns, DetectZeStack offers a free tech-detection API key in 30 seconds. WhatRuns has no public API; you'd have to scrape their Chrome extension. We give you a REST API with 14 endpoints and an HMAC-signed webhook for change alerts.