✨ Unlock the Web's Potential

Enable Cross-Origin Requests
Without Any Server

Stop building expensive proxy servers just for CORS. Enable cross-origin requests directly in your browser with zero infrastructure costs. Note: Some preflight failures cannot be resolved due to browser limitations. Learn more →

Try Playground

CORS Protection

Secure cross-origin request management

The Real Cost of CORS Solutions

See how much you can save by eliminating unnecessary infrastructure

Complex

Traditional Proxy Server

Server hosting: $20-200+/month
Domain & SSL certificates
DevOps time & monitoring
Deployment complexity
Security & maintenance overhead
$240-2400+
Annual cost
Simple

CORS Unlocker Extension

$0 server costs
Direct API calls from frontend
Zero infrastructure management
Deploy anywhere instantly
One-click installation
$0
Forever

💰 Save up to $2,400+ per year

Eliminate proxy server costs and focus your budget on what really matters - building great products.

Platform Considerations

Browser extension works on desktop Chrome, Edge, Firefox. For production apps or mobile support, you may still need traditional proxy servers for broader compatibility.

Developer Integration Guide

Integrate CORS Unlocker into your application with our npm package in 4 simple steps

1

Install NPM Package

npm install cors-unlocker
2

Detect Extension

await appCors.isExtInstalled()
3

Guide Installation

appCors.openStorePage()
4

Enable & Code

await appCors.enable()

Complete Integration Example

import appCors from 'cors-unlocker'

async function initCORS() {
  // Check if extension is installed
  const isInstalled = await appCors.isExtInstalled()
  
  if (!isInstalled) {
    // Show installation guide to user
    showInstallPrompt()
    appCors.openStorePage()
    return false;
  }
  
  // Enable CORS for your app
  try {
    await appCors.enable({
      credentials: true, // enable credentials if needed
      reason: 'Enable API access for this application'
    })
    
    // Now you can make cross-origin requests normally
    const response = await fetch('https://api.example.com/data')
    const data = await response.json()
    console.log(data)
    return true;
  } catch (error) {
    console.error('CORS enable failed:', error)
    return false;
  }
}

Perfect for Cost-Conscious Developers

Real developers, real savings. See how CORS Unlocker eliminates infrastructure costs across different use cases.

Internal SaaS Tools

Build internal dashboards and tools that integrate multiple SaaS APIs without paying for proxy servers.

💰 Typical Savings
$50-300/month
per internal tool

Rapid Prototyping

Test API integrations instantly during development without setting up backend infrastructure first.

⚡ Time Savings
2-5 days
faster to market

Startup MVPs

Launch faster with zero infrastructure costs. Perfect for validating ideas before investing in backend.

🚀 Launch Cost
$0
infrastructure needed

Powerful Features

Everything you need for seamless cross-origin request management

Easy CORS Management

Enable or disable CORS for specific websites easily via the extension or npm package.

Open Source

Fully open source for transparency and community contributions on GitHub.

Developer-Friendly npm Package

Programmatically control CORS with our powerful npm package and avoid production errors.

Secure & Privacy-Focused

Prioritizes user security and privacy, with no sensitive data collection.

Lightweight & Easy to Use

Simple, intuitive, and doesn't impact browser performance.

Cross-Browser Support

Works seamlessly with Chrome, Firefox, Edge, and other major browsers.

Browser Compatibility

🌐
Chrome
🔷
Edge
🦊
Firefox
🦁
Brave
Chrome Web Store compatible
🔴
Opera
Chrome Web Store compatible
🧭
Safari
📱
Mobile

Supported: Chrome, Edge, Firefox, and all Chrome Web Store compatible browsers

Not Supported: Safari (extension API limitations), Mobile browsers (no extension support)