The Best Open Source Fiddler AlternativesTop HTTP(S) & Web Debuggers like Fiddler

The best open source alternative to Fiddler is mitmproxy. If that doesn't suit you, our users have ranked more than 50 alternatives to Fiddler and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Fiddler are HTTP Toolkit, Proxyman, Zed Attack Proxy (ZAP) and Requestly.

filter to find the best alternatives

Fiddler alternatives are mainly HTTP(S) Debuggers, but if you're looking for Web Debuggers or Network Monitors you can filter on that. Other popular filters include Mac, Linux, Open Source, Mac + Open Source, Windows, iPhone and Google Chrome. You can also filter by region, for example EU-based alternatives if you prefer software developed in the European Union. These are just examples - use the filter bar below to find more specific alternatives to Fiddler.
More about Fiddler
Copy a direct link to this comment to your clipboard
Fiddler alternatives page was last updated

Alternatives list

  1. mitmproxy icon

    mitmproxy

     78 likes

    mitmproxy is an SSL-capable man-in-the-middle proxy for HTTP. It provides a console interface that allows traffic flows to be inspected and edited on the fly. It also features mitmdump, a commandline tool that provides a tcpdump-like interface for saving, viewing and...

    29 mitmproxy alternatives

    Cost / License

    • Free
    • Open Source (MIT)

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Flathub
    • Flatpak
    mitmweb
     
    |
    3
  2. HTTP Toolkit icon

    HTTP Toolkit

     105 likes

    HTTP Toolkit is a beautiful, cross-platform & open-source HTTP(S) debugging proxy, analyzer & client, with built-in support for modern tools and automatic interception for clients from Docker to Android to iOS.

    54 HTTP Toolkit alternatives

    Cost / License

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Android
    • iPhone
    • Docker
    HTTP Toolkit screenshot 1
     
  4. Proxyman icon

    Proxyman

     16 likes

    Monitor, intercept and debug HTTP/HTTPS and WebSocket traffic on macOS, iOS, Windows, and Linux. Includes advanced features such as Breakpoint, Map Local/Remote, scripting, filtering, reverse proxy, DNS spoofing, and automation for backend development.

    64 Proxyman alternatives

    Cost / License

    • Paid
    • Open Source

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Android
    • iPhone
    • iPad
    Proxyman screenshot 1
     
    |
    1
  5. Zed Attack Proxy (ZAP) icon

    Zed Attack Proxy (ZAP)

     30 likes

    The Zed Attack Proxy (ZAP) is an easy to use integrated penetration testing tool for finding vulnerabilities in web applications.

    43 Zed Attack Proxy (ZAP) alternatives

    Cost / License

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Java
    Zed Attack Proxy (ZAP) screenshot 1
     
    |
    1
  6. Requestly icon

    Requestly

     34 likes

    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.

    Cost / License

    • Freemium
    • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Microsoft Edge
    • Google Chrome
    • Software as a Service (SaaS)
    • Selenium
    • Firefox
    Modify HTTP Headers
     
  7. NetworkMiner icon

    NetworkMiner

     19 likes

    NetworkMiner is a Network Forensic Analysis Tool (NFAT) for Windows. NetworkMiner can extract transmitted files and certificates from PCAP files containing HTTP, FTP, SMB, SMB2, TFTP and several other protocols.

    42 NetworkMiner alternatives

    Cost / License

    Application types

    Platforms

    • Windows
    • Linux
    Files extracted from a PCAP
     
  9. Advanced REST Client icon

    Advanced REST Client

     28 likes

    API testing tool. Which allows web developers to create and test custom HTTP requests.

    75 Advanced REST Client alternatives

    Cost / License

    • Free
    • Open Source

    Application types

    Alerts

    • Discontinued

    Platforms

    • Mac
    • Windows
    • Linux
    • Chrome OS
    • AppImageHub
    • Google Chrome
    • Chromium
    Advanced REST Client screenshot 1
     
    |
    1
  10. Stoplight icon

    Stoplight

     12 likes

    Stoplight is an API Design, Development, and Documentation platform that enables consistency, reusability, and quality, all with an easy, enjoyable developer experience.

    48 Stoplight alternatives

    Cost / License

    • Freemium
    • Open Source

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    Stoplight screenshot 1
     
  11. Network Spy icon

    Network Spy

     2 likes

    Network Spy is a cross-platform network proxy and traffic analyzer built with Tauri, Rust, and React. It helps developers intercept, inspect, decrypt, and debug HTTP(S) traffic through a fast and modern desktop interface.

    Cost / License

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    Standard Request Response Viewer
     
  12. ArdorQuery icon

    ArdorQuery

     1 like

    ArdorQuery is a cross-platform tool for performing any HTTP(S) endpoints like REST API, HTML, Images, GraphQL, OData etc.

    Cost / License

    Application types

    Platforms

    • Mac
    • Linux
    • Flathub
    ArdorQuery screenshot 1
     
  13. H

    httpry

     Like

    httpry is a tool designed for displaying and logging HTTP traffic. It is not intended to perform analysis itself, but instead to capture, parse and/or log the traffic for later analysis. It can be run in real-time displaying the live traffic on the wire, or as a daemon process...

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Linux
     
  14. James icon

    James

     5 likes

    James is a HTTP Proxy and Monitor that enables developers to view and intercept requests made from the browser. It is an open-source alternative to the popular developer tool Charles.

    Cost / License

    • Free
    • Open Source

    Application types

    Alerts

    • Discontinued

    Platforms

    • Mac
    • Windows
    • Linux
    • React
    • Electron / Atom Shell
    • Node.JS
    James screenshot 1
     
12 of 20 Fiddler alternatives