Top 12 Open-Source Alternatives to Fiddler

Fiddler

Fiddler is a debugging program for websites.

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Product categories

Developer Tools API Tools APIs Monitoring Tools Proxy Security API Clients Debugging Log Management Performance Monitoring Productivity Software Development

Summary

The top open-source alternatives to Fiddler are Postman, Proxyman.io, and HTTP Toolkit. One of the criteria for ordering this list is the number of mentions that products have on reliable external sources. You can suggest additional sources through the form here.

Postman Landing Page
1

Postman

The Collaboration Platform for API Development
Pricing:
- Open Source
#API Tools #Developer Tools #APIs 30 social mentions
Proxyman.io Landing Page
2

Proxyman.io

Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains.
Pricing:
- Open Source
- $49 / Annually
#Debugging #Developer Tools #Proxy 27 social mentions
HTTP Toolkit Landing Page
3

HTTP Toolkit

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.
Pricing:
- Open Source
- Freemium
- €7 / Monthly (for a Pro subscription)
#Software Development #Development Tools #Security 30 social mentions
Wireshark Landing Page
4

Wireshark

Wireshark is a network protocol analyzer for Unix and Windows. It lets you capture and interactively browse the traffic running on a computer network.
Pricing:
- Open Source
#Log Management #Performance Monitoring #Monitoring Tools 12 social mentions
mitmproxy Landing Page
5

mitmproxy

mitmproxy is an SSL-capable man-in-the-middle proxy for HTTP.
Pricing:
- Open Source
#Software Development #Security #Developer Tools 93 social mentions
Insomnia REST Landing Page
6

Insomnia REST

Design, debug, test, and mock APIs locally, on Git, or cloud. Build better APIs collaboratively for the most popular protocols with a dev‑friendly UI, built-in automation, and an extensible plugin ecosystem.
Pricing:
- Open Source
#API #API Tools #Developer Tools 134 social mentions
Requestly Landing Page
7

Requestly

A Powerful API Mocking and Testing Tool
Pricing:
- Open Source
- Freemium
- Free Trial
#Open Source #Testing #Developer Tools 35 social mentions
tcpdump Landing Page
8

tcpdump

tcpdump is a common packet analyzer that runs under the command line.
Pricing:
- Open Source
#Productivity #Time Tracking #Log Management
Hoppscotch Landing Page
9

Hoppscotch

Open source API development ecosystem
Pricing:
- Open Source
- Freemium
- Free Trial
#Productivity #API Tools #Developer Tools 102 social mentions
Rapid7 Landing Page
10

Rapid7

Find security issues, verify vulnerability mitigations & manage security assessments with Metasploit. Get the world's best penetration testing software now. DownloadPen testing software to act like an attacker.
Pricing:
- Open Source
#Web Application Security #Security #Monitoring Tools 1 social mentions
cURL Landing Page
11

cURL

cURL is a computer software project providing a library and command-line tool for transferring data...
Pricing:
- Open Source
#API Tools #Developer Tools #APIs 129 social mentions
Squid Proxy Landing Page
12

Squid Proxy

Website Content Acceleration and Distribution. Thousands of web-sites around the Internet use Squid to drastically increase their content delivery. Squid can reduce your server load and improve delivery speeds to clients.
Pricing:
- Open Source
#DevOps Tools #Developer Tools #Proxy