HeaderSwap vs Requestly for Header Editing

Updated October 2026 · v1.2.0

Requestly is a broader HTTP toolkit: redirects, header edits, script injection, and API mocks. That breadth is the reason to use it when the bug is not a header.

HeaderSwap only modifies headers and URL redirects, with profiles for Local, Staging, and Prod. If you need to mock a REST or GraphQL API, Requestly — or another mocking tool — is the better fit. HeaderSwap is not affiliated with Requestly.

Get HeaderSwap for Chrome

Match the tool to the bug

Write down the failure before you install a second extension.

Open the failing request. In Chrome DevTools, read the request headers, response headers, and status.
If the body or route is wrong. A mock or a rewrite of the response body is outside HeaderSwap. Use a tool that mocks APIs.
If only a header or redirect is wrong. A header editor is enough. You do not need script injection for that.

Use HeaderSwap for the header case

Free is enough for two environments and a short rule list. Premium adds unlimited profiles, auto-expiry, and optional sync.

Create a Local profile. Add the header or redirect. Limit it to the host you are testing.
Duplicate as Staging. Keep the same rules and swap the token or host.
Pause when you are finished. One switch stops every modification so the next site is unchanged.

Tradeoffs

Requestly is the better choice for mocks, GraphQL, and injected scripts.
HeaderSwap is the smaller choice for headers, CORS response headers, and regex redirects.
Neither extension replaces a correct server-side CORS configuration in production.

Frequently Asked Questions

Can HeaderSwap mock an API response?

No. It does not replace the response body. It changes headers and can redirect the URL.

Can it inject a script into the page?

No. That is a different kind of tool.

Which one should a QA team standardize on?

Standardize on the tool that covers the cases you actually file. A header-only team does not need a mocking platform.