Alternatives to ModHeader
A browser extension for modifying HTTP request and response headers and cookies while testing. The listings below can replace it for an important use case. Each note says what changes if you switch.
The original
ModHeader
A browser extension for modifying HTTP request and response headers and cookies while testing.
Replacements
Listings that take over the same core job as ModHeader.
Requestly
An API client for designing and testing APIs, plus a browser HTTP interceptor for modifying requests.
Requestly's browser interceptor rewrites requests, redirects and headers, and adds an API client, though its focus has shifted toward the API client side.
Also worth comparing
These listings name ModHeader as their own alternative, so the relationship runs both ways.
Cookie-Editor
Creates, edits and deletes cookies for the current tab.
ModHeader edits request and response headers as well as cookies with URL and tab filters, but it is closed source and aimed at testing rather than cookie management.
User-Agent Switcher and Manager
A configurable browser extension that changes the User-Agent string the browser reports, globally or per site.
ModHeader edits request and response headers and cookies with URL, tab or resource filters, but does not describe changing JavaScript navigator properties or Client Hints.
Similar software
Related functionality, not a direct replacement.
HTTP Toolkit
An open-source desktop tool for intercepting, inspecting and rewriting HTTP and HTTPS traffic.
Proxyman
Desktop HTTP and HTTPS debugging proxy for capturing, inspecting and mocking network requests.
Charles
An HTTP and HTTPS debugging proxy that shows all web traffic between a computer and the internet.
Fiddler Everywhere
A cross-platform web debugging proxy for capturing, inspecting, modifying and replaying HTTP(S) traffic.
Reqable
An HTTP debugging proxy and REST API client for desktop and mobile in one application.
RESTer
A browser extension for Firefox and Chrome for crafting and sending HTTP requests.
