corsproxy.io alternative: corsproxy.dev compared

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 Nov 12, 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.

When switching makes sense

• Your frontend calls an API that needs a secret key. corsproxy.dev adds the secret server-side, so it never ships to the browser.
• You want to be able to self-host. We publish an MIT-licensed Go relay; corsproxy.io is closed source.
• You want a daily allowance. Free is 500 requests and 250 MB a day, no card. Pro is $5/month for 20,000 requests and 10 GB a day.

Stay on corsproxy.io if you need an uptime SLA on a small plan, format conversion, or image transforms. Switching is a one-line change; create a free key to try it next to your current setup.

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 Free and Pro have no SLA; only Enterprise does.
• 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. 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

We also publish a simpler open-source CORS relay, an MIT-licensed Go project, that you can self-host if you can't send traffic through a third party. It is a separate program from the hosted service: no accounts or quotas, no managed upstream headers, no reqHeaders/resHeaders, and no ttl caching. 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, including hostnames that resolve to private addresses (checked with a separate DNS lookup before the fetch, which fails open if the resolver errors). 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.

Is corsproxy.io safe?

We found no independent security audit of corsproxy.io. It is also the wrong question. Any hosted proxy, us included, sees every URL and header you send through it, so don't put credentials or personal data in the request unless you trust the operator with them. The better question is what the proxy does with secrets you need to send. corsproxy.dev can store an upstream key server-side so it never reaches the browser, as described above. Our request logs are kept for 30 days.

If corsproxy.io calls have recently started failing, see corsproxy.io not working: it now requires a key on every request.

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 want a basic relay you can self-host later: corsproxy.dev publishes one, though it is simpler than the hosted service.
• You control the API you're calling: neither. Add CORS headers on your server; see how to enable CORS in Express.