corsproxy.dev vs corsproxy.io: an honest comparison

corsproxy.io and corsproxy.dev are both managed CORS proxies with API keys and a dashboard, and the names are one letter-group apart. They're different companies with different strengths. This is our side-by-side, including the parts where corsproxy.io is ahead.

Sep 25, 2026 · 10:30 UTC · ~5 min read · Updated Sep 30, 2026

Disclosure: corsproxy.dev is our product. corsproxy.io figures come from their pricing page and homepage as of the date above; check them for current numbers.

At a glance

Where corsproxy.io is ahead

• Uptime commitments. Their paid plans come with a 99.9% or 99.99% monthly SLA. We publish a status page but no SLA outside Enterprise.
• More features around the proxy. JSON/XML/CSV conversion, image transformations, and a scraping API. corsproxy.dev sticks to proxying, with caching and header overrides on top.

If those are what you need, corsproxy.io is a reasonable choice.

Where corsproxy.dev is ahead

Secrets stay out of the browser

Most people reach for a CORS proxy to call an API that needs a key: OpenAI, Notion, a payments or CRM API. Anything you put in browser JavaScript is readable by every visitor, and corsproxy.io's own docs advise against putting private upstream secrets in browser code. corsproxy.dev's managed upstream headers handle that case: you store the secret on your corsproxy.dev key once, and the proxy adds it only to requests going to the host and path you name. We walk through it for OpenAI, Notion, and Google Sheets in Call OpenAI, Notion, and Google Sheets without leaking your API key, including what it doesn't protect.

You can run it yourself

The proxy core is an MIT-licensed Go project. If you outgrow the hosted plans or can't send traffic through a third party, you can self-host the same core. See self-host vs managed for when that makes sense.

Documented SSRF protection

A proxy that will fetch whatever URL it's handed can be pointed at private networks and cloud metadata endpoints. That's SSRF. corsproxy.dev refuses private and internal targets, and the details are in how a CORS proxy can be abused. corsproxy.io's public pages don't say either way; if it matters to you, ask them.

Switching between them

Both take the target as a URL-encoded query parameter plus a key, so moving in either direction is a one-line change:

const target = encodeURIComponent('https://api.example.com/data');

// corsproxy.io
fetch(`https://corsproxy.io/?key=YOUR_CORSPROXY_IO_KEY&url=${target}`);

// corsproxy.dev
fetch(`https://api.corsproxy.dev/proxy?url=${target}&key=YOUR_CORSPROXY_DEV_KEY`);

Keep them apart when you store keys: a corsproxy.io key won't work on corsproxy.dev, and the other way round.

Their reqHeaders, resHeaders, and ttl parameters work the same way here (ttl needs Pro), so those carry over unchanged. See header overrides and caching.

Which one to pick

• You need format conversion, image transforms, or an uptime SLA: corsproxy.io.
• Your frontend calls an API that needs a secret key: corsproxy.dev, so the key never ships to the browser.
• You might need to self-host later, or you want to read the code: corsproxy.dev.
• You control the API you're calling: neither. Add CORS headers on your server; see how to enable CORS in Express.