Requestly
Charles Proxy
Fiddler
HTTP Toolkit
Header Editor
Proxyman.io
EditThisCookie
Free browser extension to modify HTTP request and response headers. No sign-up. Works on Chrome, Firefox, and Edge.

Requestly
Header Editor
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.
Which is more popular?
Website, pricing, platforms and company facts side by side.
|
m
modheader
|
|
|
|---|---|---|
| Website | app.modheader.com | headerflex.app |
| 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 modheader and HeaderFlex.app. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.

On the pricing front, Requestly strikes a balance between affordability and functionality. It is an open-source tool, offering freemium to individual developers and affordable pricing plans for team collaboration. We...
We have no reviews of HeaderFlex.app yet. Be the first one to post
When comparing modheader and HeaderFlex.app, you can also consider the following products.


HTTP proxy / HTTP monitor / Reverse Proxy
Compare Charles Proxy to modheader or HeaderFlex.app:
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.
Compare Header Editor to modheader or HeaderFlex.app:

Fiddler is a debugging program for websites.
Compare Fiddler to modheader or HeaderFlex.app:

HTTP Header Checker Tools
Compare RequestHeaders.com to modheader or HeaderFlex.app:

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.
Compare HTTP Toolkit to modheader or HeaderFlex.app: