Apps similar to modheader include Requestly, which is open source with a free version. Other options are OpenHeader, Header Override, Header Editor and Live HTTP Headers. In total there are six Web Debuggers like modheader for Mac, Windows, Linux and the web.
Requestly is a lightweight proxy available as a browser extension & desktop app to intercept & modify network requests. Using Requestly you can Modify Headers, Redirect Url, Mock API response, Delay/Throttle requests, etc.
United States
Lightweight Chrome extension lets you add, modify, or remove HTTP request and response headers securely using declarativeNetRequest. Open source with no ads, tracking, or telemetry, minimal permissions, supports multiple profiles, per-URL filters, and import/export.
Header Override lets you modify or inject HTTP headers and cookies to customize web requests and responses.
Ukraine
Header Editor lets developers add, modify, or remove HTTP request headers per URL pattern using Chrome's MV3 declarativeNetRequest — no response-body access, rules stay local.
Japan
The goal of this project is to adds information about the HTTP headers in three ways:
Canada
Open-source Chrome extension to add & modify HTTP request headers and share configs in one click. A lightweight ModHeader alternative — no ads, no tracking.
