Free Cross-Origin Isolation Checker (COOP/COEP/CORP)

Free tool

Check COOP, COEP, and CORP headers on your live URL to confirm cross-origin isolation is configured correctly and SharedArrayBuffer can run safely.

  • COOP/COEP status
  • CORP alignment
  • SharedArrayBuffer readiness
No credit card requiredProduction-safe (100% passive)No setup or code required
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What you get for free

18 core security checks via this tool, passive scans, step-by-step remediation, security score on every result.

What Essential adds at $39/mo

+17 advanced checks, continuous monitoring, daily security score history, email alerts, GitHub SAST, board-ready PDFs, SOC 2 / ISO 27001 / PCI reports.

What this checker validates

  • COOP value (same-origin recommended)
  • COEP: require-corp
  • CORP/CORS headers on third‑party resources

Across 1,067 recent scans, 95.3% have no Cross-Origin-Embedder-Policy, 86.3% no Cross-Origin-Opener-Policy, and 94.8% no Cross-Origin-Resource-Policy. Cross-origin isolation is rarely fully configured.

What is cross-origin isolation?

COOP+COEP (with CORP/CORS on resources) isolate your page from other origins, unlocking powerful APIs like SharedArrayBuffer and improving leak resistance.

Implementation examples

Once you've identified the gap, applying the fix is straightforward. Here are the three configurations developers reach for most often.

Nginx

add_header Cross-Origin-Opener-Policy "same-origin" always;
add_header Cross-Origin-Embedder-Policy "require-corp" always;
add_header Cross-Origin-Resource-Policy "same-origin" always;

Apache

Header always set Cross-Origin-Opener-Policy "same-origin"
Header always set Cross-Origin-Embedder-Policy "require-corp"
Header always set Cross-Origin-Resource-Policy "same-origin"

Node.js (Express + Helmet)

import helmet from "helmet"

app.use(
  helmet({
    crossOriginOpenerPolicy: { policy: "same-origin" },
    crossOriginEmbedderPolicy: { policy: "require-corp" },
    crossOriginResourcePolicy: { policy: "same-origin" },
  }),
)

Tool-specific questions

Why did my app break after enabling COEP?

Some third‑party resources lack CORP/CORS headers. Update their config or host them yourself.

Is isolation required for WebAssembly?

Some advanced features benefit or require isolation. Check browser docs for specifics.
Why Barrion

Built for the engineers who already have enough to fix.

Speed

Real-time results

Instant analysis with a detailed report. You see findings as the scan runs, not after.
Coverage

Comprehensive checks

35+ checks per scan covering TLS, headers, CORS, cookies, DNS, email auth, and more, in a single pass.
Action

Step-by-step fixes

Every finding ships with the exact remediation step for your framework. Hand it to the engineer who owns the surface.
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FAQ

Frequently asked.

What is Barrion and how does it enhance website security?
Barrion is a security testing and monitoring platform for engineering teams, covering three products: passive DAST that continuously watches your live web apps and APIs, SAST via GitHub that scans your codebase for secrets, insecure patterns and vulnerable dependencies, and AI pentesting that runs active, agent-driven attacks with proof-of-exploit. Findings come with step-by-step fixes you can ship immediately.
How safe is Barrion to use for security testing?
Every default Barrion scan is 100% passive and read-only. We never submit forms, brute-force endpoints or interact with state-changing routes, so it's safe to run against production.
What types of security issues does Barrion identify?
Barrion is a security testing and monitoring platform, so coverage spans three surfaces. Passive DAST flags misconfigurations across TLS/HTTPS, security headers, cookie flags, CORS policy, DNS records, email authentication (SPF/DKIM/DMARC), network exposure and common web hygiene issues. SAST via GitHub finds secrets in code, insecure patterns and vulnerable dependencies. AI pentesting adds exploitable findings like SQL injection, XSS and broken access control with proof-of-exploit.
What specific security checks does Barrion perform?
Barrion checks TLS/HTTPS configuration, HTTP security headers, cookie flags, CORS policy, DNS and email authentication records, network exposure and common web hygiene issues, then prioritises them by severity with clear remediation.
What is Barrion's smart crawling?
Smart crawling automatically discovers the pages and endpoints of your app so scans cover the surface that matters, without you manually listing every URL.
How often does Barrion perform security scans?
Manual scans on demand. Continuous monitoring runs automatically on Essential (weekly+) and Business (daily), and alerts you the moment a new issue appears.
Is Barrion suitable for security testing of all business sizes?
Yes. Barrion is a security testing and monitoring platform, with passive DAST, SAST via GitHub and AI pentesting available to solo developers, startups, scale-ups and enterprise security teams alike, without adding headcount.
How does Barrion handle data security and privacy during security testing?
Scans are passive and read-only by default, and we never store or expose sensitive data from your application. Pentests are rate-limited and non-destructive, designed to confirm exploitability without altering data or affecting availability.
What if I'm not satisfied with Barrion's security testing service?
Paid plans start with a free trial, and you can cancel anytime. If something isn't right, contact us and we'll make it work for your team.
How does Barrion help with SOC 2, ISO 27001, NIS2, and other compliance frameworks?
Barrion produces audit-ready PDF and CSV reports suitable for SOC 2, ISO 27001, PCI DSS and NIS2, ready to share with auditors, customers and your board.

Anything else? Email contact@barrion.io.

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