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

The best open source alternative to Fiddler is Wireshark. If that doesn't suit you, our users have ranked more than 25 alternatives to Fiddler and 16 is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Fiddler are mitmproxy, HTTP Toolkit, OWASP Zed Attack Proxy (ZAP) and Advanced REST Client.

filter to find the best alternatives

Fiddler alternatives are mainly API Clients but may also be Web Debuggers or HTTP Clients. Other popular filters include Mac + Open Source. Filter by these or use the filter bar below if you want a narrower list of alternatives or looking for a specific functionality of Fiddler.
Fiddler iconFiddler
  203
  • ...

Fiddler is a 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...

More about Fiddler
More about Fiddler
Fiddler alternatives page was last updated Feb 18, 2025
Copy a direct link to this comment to your clipboard
Alternatives
  1. Wireshark icon

    Wireshark

     914 likes
    Copy a direct link to this comment to your clipboard

    Wireshark is a premier network protocol analyzer used globally in industries and education, offering multi-platform support, deep protocol inspection, powerful display filters, and VoIP analysis. It allows both live capture and offline analysis, supporting various networks and protocols.

    54 Wireshark alternatives

    License model

    • Free • Open Source

    Application types

    Country of Origin

    • US flagUnited States

    Platforms

    • Mac
    • Windows
    • Linux
    • BSD
    • Snapcraft
    • Flathub
    • Homebrew
    • Chocolatey
    Wireshark screenshot 1

    Wireshark Features

    1.  Detailed packet analysis
    2.  Network Usage History
    3.  Support for Android Things
    4.  Website Monitoring
    5.  Work Item Tracking
    6.  Command line interface

    Wireshark VS Fiddler

     
    Comments about Wireshark as an Alternative to Fiddler
    Most Recent Comment
    Guest
    Positive •Aug 19, 2021
    3

    Wireshark is a packet analyzer, not an alternative to debugging proxy like Fiddler or MITM are.

    tso
    Negative •Jan 16, 2025
    0

    Wireshark is a low level network analyser, while Fiddler aims HTTP analysis

    AlexanderTaeschner
    Negative •Feb 18, 2025
    0

    Wireshark is looking at the lowest levels of the OSI model, while Fiddler is used for HTTP(S) analysis at OSI level 7.

    Fiddler Icon
    Wireshark icon

    • This alternative is disputed. Wireshark is a legitimate Fiddler alternative, but it might have issues that some users think are important.

    • Wireshark is the most popular Windows, Mac & Linux alternative to Fiddler.

    • Wireshark is the most popular Open Source & free alternative to Fiddler.

    • Wireshark is Free and Open SourceFiddler is Freemium and Proprietary
  2. mitmproxy icon

    mitmproxy

     69 likes
    Copy a direct link to this comment to your clipboard

    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...

    17 mitmproxy alternatives

    License model

    • Free • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Flathub
    • Flatpak
    mitmweb

    mitmproxy Features

    1.  Web page Debugging
    2.  HTTP(S) Debugging
    3.  SSL
    4.  Debugging
    5.  Support for scripting
    6.  Intercepting HTTP calls

    mitmproxy VS Fiddler

     
    Comments about mitmproxy as an Alternative to Fiddler
    Most Recent Comment
    Guest
    Positive •Nov 15, 2018
    4

    mitmproxy is able to edit response data

    Guest
    Positive •Aug 30, 2021
    0

    mitmproxy is free and well featured, but fiddler does have an easier workflow to start with

    Guest
    Positive •May 16, 2019
    0

    It's able to analyze http requests made by other proxies, many other of the alternatives here only allow creating requests

    Fiddler Icon
    mitmproxy icon

    • Most users think mitmproxy is a great Fiddler alternative.

    • mitmproxy is Free and Open SourceFiddler is Freemium and Proprietary
  4. HTTP Toolkit icon

    HTTP Toolkit

     43 likes
    Copy a direct link to this comment to your clipboard

    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.

    48 HTTP Toolkit alternatives

    License model

    • Freemium • Open Source

    Application types

    Country of Origin

    • GB flagUnited Kingdom

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    HTTP Toolkit screenshot 1

    Properties

    1.  Lightweight

    Features

    1.  HTTP(S) Debugging
    2.  One click interception
    3.  Debugging
    4.  HTTP mocking
    5.  Ad-free
    6.  Requests monitoring
    7.  Penetration Testing
    8.  Performance analysis
    9.  Built in docs
    10.  HTTPS Support
    11.  OpenAPI integration
    12.  Portable

    HTTP Toolkit VS Fiddler

     

    • HTTP Toolkit is the most popular Web-based & Android alternative to Fiddler.

    • HTTP Toolkit is Freemium and Open SourceFiddler is Freemium and Proprietary
    • HTTP Toolkit is LightweightFiddler is not according to our users
  5. OWASP Zed Attack Proxy (ZAP) icon

    OWASP Zed Attack Proxy (ZAP)

     29 likes
    Copy a direct link to this comment to your clipboard

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

    30 OWASP Zed Attack Proxy (ZAP) alternatives

    License model

    • Free • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    OWASP Zed Attack Proxy (ZAP) screenshot 1

    OWASP Zed Attack Proxy (ZAP) Features

    1.  Proxy support

    OWASP Zed Attack Proxy (ZAP) VS Fiddler

     
    Comments about OWASP Zed Attack Proxy (ZAP) as an Alternative to Fiddler
    Guest
    Negative •Feb 1, 2018
    6

    ZAP is a proxy for attacks, not a proxy for development

    Fiddler Icon
    OWASP Zed Attack Proxy (ZAP) icon

    • Some users think OWASP Zed Attack Proxy (ZAP) is a great Fiddler alternative, some don't.

    • OWASP Zed Attack Proxy (ZAP) is Free and Open SourceFiddler is Freemium and Proprietary
  6. Advanced REST Client icon

    Advanced REST Client

     26 likes
    Copy a direct link to this comment to your clipboard

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

    67 Advanced REST Client alternatives

    License model

    • Free • Open Source

    Application types

    Country of Origin

    • PL flagPoland
    • European Union flagEU

    Platforms

    • Mac
    • Windows
    • Linux
    • Chrome OS
    • AppImageHub
    • Google Chrome
    • Chromium
    Advanced REST Client screenshot 1
    Discontinued

    The latest version (17.0.9) is from March 2022.

    Advanced REST Client Features

    1.  Full headers control
    2.  Electron based
    3.  Web tool
    4.  REST API
    5.  Sync with Google Drive
    6.  REST Client
    7.  API Testing

    Advanced REST Client VS Fiddler

     
    Comments about Advanced REST Client as an Alternative to Fiddler
    Guest
    Negative •Aug 23, 2019
    5

    Fiddler is a Proxy tool used to intercept and examine HTTP requests not to create an test HTTP requests.

    Fiddler Icon
    Advanced REST Client icon

    • This alternative is disputed. Advanced REST Client is a legitimate Fiddler alternative, but it might have issues that some users think are important.

    • Advanced REST Client is Free and Open SourceFiddler is Freemium and Proprietary
  7. Requestly icon

    Requestly

     30 likes
    Copy a direct link to this comment to your clipboard

    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.

    28 Requestly alternatives

    License model

    • Freemium • Open Source

    Application types

    Country of Origin

    • US flagUnited States

    Platforms

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

    Properties

    1.  Lightweight

    Features

    1.  Intercepting HTTP calls
    2.  Requests monitoring
    3.  Bug reporting
    4.  Web page Debugging
    5.  One click interception
    6.  Android Development
    7.  HTTP(S) Debugging
    8.  Real time collaboration
    9.  Ad-free
    10.  Dark Mode
    11.  REST Client
    12.  Command line interface

    Requestly VS Fiddler

     

    • Requestly is the most popular SaaS alternative to Fiddler.

    • Requestly is Freemium and Open SourceFiddler is Freemium and Proprietary
    • Requestly is LightweightFiddler is not according to our users
  9. Stoplight icon

    Stoplight

     12 likes
    Copy a direct link to this comment to your clipboard

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

    42 Stoplight alternatives

    License model

    • Freemium • Open Source

    Application type

    Country of Origin

    • US flagUnited States

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    Stoplight screenshot 1

    Stoplight Features

    1.  API Management

    Stoplight VS Fiddler

     
  10. NetworkMiner icon

    NetworkMiner

     15 likes
    Copy a direct link to this comment to your clipboard

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

    34 NetworkMiner alternatives

    License model

    • Free • Open Source

    Application types

    Country of Origin

    • SE flagSweden
    • European Union flagEU

    Platforms

    • Windows
    Files extracted from a PCAP

    NetworkMiner Features

    1.  Portable

    NetworkMiner VS Fiddler

     
  11. ArdorQuery icon

    ArdorQuery

     Like
    Copy a direct link to this comment to your clipboard

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

    54 ArdorQuery alternatives

    License model

    • Free • Open Source

    Application types

    Platforms

    • Mac
    • Linux
    • Flathub
    ArdorQuery screenshot 1

    ArdorQuery Features

    1.  REST API
    2.  QA Automation

    ArdorQuery VS Fiddler

     

  12. httpry

     Like
    Copy a direct link to this comment to your clipboard

    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...

    16 httpry alternatives

    License model

    • Free • Open Source

    Application type

    Platforms

    • Linux

    httpry Features

    1.  Logging
    2.  HTTP Monitoring

    httpry VS Fiddler

     
10 of 16 Fiddler alternatives