Fiddler Alternatives

HTTP proxy / HTTP monitor / Reverse Proxy

Wireshark is a network protocol analyzer for Unix and Windows. It lets you capture and interactively browse the traffic running on a computer network.

Open Source

Flagsmith lets you manage feature flags and remote config across web, mobile and server side applications. Deliver true Continuous Integration. Get builds out faster. Control who has access to new features. We're Open Source.

Try for free Open Source freemium

The Collaboration Platform for API Development

Open Source

Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains.

Open Source $49.0 / Annually

Horangi is a leading cyber-security solution that provides instant response and threat detection for companies who lack the time and expertise to monitor their system.

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.

Open Source freemium €7.0 / Monthly (for a Pro subscription)

Network security & identity management

Audit your website security and web applications for SQL injection, Cross site scripting and other...

Intruder is a security monitoring platform for internet-facing systems.

paid Free Trial

Skybox Vulnerability Control is an industry-leading cyber-security management solution that allows threat-centric vulnerability prioritization and scan-less vulnerability assessments in order to address security challenges within large and complicat…

mitmproxy is an SSL-capable man-in-the-middle proxy for HTTP.

Open Source

Penetration testing solution for risk validation.

Netsparker Security Scanner is a simple-yet-powerful web-based security scanner that automatically identifies XSS, SQL Injection, and all the other vulnerabilities and security flaws in sites, web apps, and web services.