Fiddler is described as 'Web Debugging Proxy which logs all HTTP(S) traffic between your computer and the Internet. Fiddler allows you to inspect all HTTP(S) traffic, set breakpoints, and "fiddle" with incoming or outgoing data' and is a very popular http(s) debugger in the network & admin category. There are more than 50 alternatives to Fiddler for a variety of platforms, including Windows, Mac, Linux, Web-based and iPhone apps. The best Fiddler alternative is Charles. It's not free, so if you're looking for a free alternative, you could try mitmproxy or HTTP Toolkit. Other great apps like Fiddler are Proxyman, Burp Suite, HTTP Debugger and Zed Attack Proxy (ZAP).
Fluxzy Desktop is an HTTP and HTTPS debugging proxy for Windows, macOS, and Linux. If you already use Fiddler, Charles, or Proxyman, you know the drill: capture traffic, inspect requests and responses, tweak them, replay them. Fluxzy does all of that, with support for HTTP/1.
WebSiteSniffer is a packet sniffer tool that captures all Web site files downloaded by your Web browser while browsing the Internet, and stores them on your hard drive under the folder that you choose.
Packet sniffer tool that captures all HTTP requests/responses sent between the Web browser and the Web server and displays them in a simple table.
HTTP Headers allows you to quickly see the HTTP header information for the current URL.
Helps you to test the Rest API with your phone including features like import, edit and export postman collections.With this, you don't need to look for your laptop or PC whenever you need to test and modify your REST APIs. You can work on them anytime, on the go.
Speedrank monitors the performance of your website in the background. It displays Lighthouse reports over time and delivers recommendations for improvement. Speedrank is a paid product with 14-day-trial.
ReqRes is an open-source, high-performance, modern native web debugging proxy for macOS. It lets you capture, inspect, modify, and intercept HTTP(S) traffic in real time.
Network Spoofer lets you change websites on other people's computers - from your phone.
RestCase is a security-focused API development platform that enables its users to rapidly create secure microservices, mock them in order to start testing, monitor APIs and collaborate on their development and testing.
PSI Lynx is a SaaS platform for running bulk Lighthouse and PageSpeed audits across many website pages. It helps SEO teams, developers, agencies, and business owners monitor Core Web Vitals, track performance history, and catch regressions after releases, plugin updates, design...
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It is free, based on a open-source base implementation and is able to analyse not only HTTP/v1.1, but also HTTP/2 and HTTPS traffic. It is easy to configure and under Windows integrates itself as system proxy, so that the client programs do not need to be reconfigured.