
HTTP Toolkit
Live HTTP Headers
HTTP Debugger
URL Encoder and Decoder
Fiddler
Proxyman.io
Requestly
Online tools for inspecting and debugging HTTP requests.

Requestly
modheader
Header Editor
RequestHeaders.com
VibeHeader
HTTP Header Live
Modify Header Value (HTTP Headers)
A local-first ModHeader alternative: rewrite HTTP request & response headers via Chrome's native declarativeNetRequest. No backend, no account, no telemetry.
Which is more popular?
Website, pricing, platforms and company facts side by side.
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| Website | httptools.dev | headerflex.app |
| Listed in |
What each product offers, as listed by its team.


No features have been listed yet.
Possible disadvantages
An editorial look at what each product does well and who it suits.


Overall verdict
Why this product is good
Recommended for
No analysis of HeaderFlex.app yet.
How often each product is chosen within a category, 0–100% relative to the other.


Share your experience with using httptools.dev and HeaderFlex.app. For example, how are they different and which one is better?
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Beautiful, cross-platform & open-source tools to debug, test & build with HTTP(S). One-click setup for browsers, servers, Android, CLI tools, scripts and more.
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A Powerful API Mocking and Testing Tool
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The goal of this project is to adds information about the HTTP headers in three ways:
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Free browser extension to modify HTTP request and response headers. No sign-up. Works on Chrome, Firefox, and Edge.
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Debug HTTP API calls to a back-end and between back-ends. Easy of use, clean UI, and short ramp-up time. Not a proxy, no network issues!
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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.
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