
Requestly
modheader
RequestHeaders.com
VibeHeader
HTTP Header Live
Modify Header Value (HTTP Headers)
Header Override
A local-first ModHeader alternative: rewrite HTTP request & response headers via Chrome's native declarativeNetRequest. No backend, no account, no telemetry.
Requestly
modheader
VibeHeader
Header Override
Live HTTP Headers
Modify Header Value (HTTP Headers)
Add custom HTTP request headers to any site. Set Authorization tokens, override Content-Type, inject debug headers per URL pattern. declarativeNetRequest. Free: 5 rules, Pro: unlimited.

Which is more popular?
Website, pricing, platforms and company facts side by side.
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HE
Header Editor
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| Website | headerflex.app | dev-tools-hub.xyz |
| Listed in |
What each product offers, as listed by its team.

Possible disadvantages
Possible disadvantages
How often each product is chosen within a category, 0–100% relative to the other.

Share your experience with using HeaderFlex.app and Header Editor. For example, how are they different and which one is better?
When comparing HeaderFlex.app and Header Editor, you can also consider the following products.

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HTTP Header Checker Tools
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An open-source ModHeader alternative trusted by 10,000+ developers. Edit and share headers with Profiles, URL filters, and a built-in tester.
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Open-source Chrome, Firefox, and Edge extension to modify HTTP request and response headers, cookies, and local profiles for API debugging.
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Displays the HTTP header. Edit it and send it.
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