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Is your site
actually secure?

Most startup sites fail basic security headers. This free tool scans yours in under 3 seconds and tells you exactly what to fix — with copy-paste code for Next.js, Vercel, Nginx, and Cloudflare.

89%
of startups fail headers check
8
security headers analyzed
<3s
instant results
FREE
no signup required

We only read HTTP response headers. No invasive scanning.

8 CHECKS

What we analyze

HSTS
Force HTTPS on all connections
CSP
Block XSS & code injection
X-Frame-Options
Prevent clickjacking
Referrer-Policy
Stop data leakage
Permissions-Policy
Restrict browser APIs
X-Content-Type
Block MIME sniffing
CORS
Cross-origin control
X-XSS-Protection
Legacy XSS filter
01Enter your URL
02We check 8 headers
03Get your A-F grade

Headers are just the surface

A full Sable scan points autonomous agents at your app and tests exposed secrets, broken authentication, IDOR/BOLA, injection, and the entire OWASP Top 10 — then hands you the exact fixes. Start free with 150 credits, no credit card.

Run a full scan free — 150 credits

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FREE SCAN BY STACK

Free security scan for your stack

Targeted checks and the real vulnerabilities that hit each stack — plus 150 free founder credits to run a full agent scan.