Alternatives to Firefox Developer Tools for all platforms with any license

Google Chrome Developer Tools

The Google Chrome Developer Tools provide an integrated environment for debugging, optimizing, and understanding a web application, or website, running in Google Chrome....

Free Open Source Mac Windows Linux Chrome
HTTPS Support Add a feature

136 Like
repl.it

Online Interpreters in JavaScript. Online coding and REPL. Run and share code. Try QBasic, Forth, Ruby, Python, Lua, Scheme, Emoticon, Brainfuck, LOLCODE, Unlambda...

Freemium Web
Cloud IDE Code completion Code formatting Real time collaboration ... Running code Add a feature

23 Like
Plunker

Plunker is an online community for creating, collaborating on and sharing your web development ideas. .

Free Open Source Web
Programmers Documentation Add a feature

20 Like
Coding Ground

Compile and Execute your favorite programming languages online, click any of the following to proceed! Web Technologies, Text Formatting, Useful Utilities, Programming...

Free Web
No features added Add a feature

6 Like
HttpFox

HttpFox monitors and analyzes all incoming and outgoing HTTP traffic between the browser and the web servers. It aims to bring the functionality known from tools like...

Free Mac Windows Linux Waterfox Pale Moon
Customer Analytics Firefox extension HTTP Monitoring Legacy Firefox Addon ... Pale Moon Extension Static analysis Web log analysis Add a feature

9 Like
- Discontinued The project is no longer developed. Last version, 0.8.14.1, released in May 2014, is not compatible with Firefox, but the extension still works on XUL-based Firefox forks like https://alternativeto.net/software/waterfox/ and https://alternativeto.net/software/palemoon/
HTTP Debugger

HTTP Debugger Pro - A Professional HTTP Sniffer and Analyzer for Developers

Commercial Windows
HTTP Monitoring Add a feature

3 Like
HttpWatch

HttpWatch is an HTTP viewer and debugger that integrates with IE and Firefox to provide seamless HTTP and HTTPS monitoring without leaving the browser window. It's...

Commercial Windows Firefox
No features added Add a feature

6 Like
SplineTech Javascript Debugger

SplineTech JavaScript Debugger is the fastest independent standalone JavaScript Debugger that enables you to debug JavaScript for IE completely independently of any...

Commercial Windows
No features added Add a feature

4 Like
Code Cola

Code Cola is a chrome extension to editor online pages' style visibility. It helps visual designer, interactive designer, web site operator and other peoples modify...

Free Open Source Mac Windows Linux
No features added Add a feature

1 Like
Visual Inspector

Visual Inspector by CanvasFlip is a website inspector and editor made by and for designers. Get measurements, inspect and make changes to design and text inline and with...

Freemium $ $ $ Web Chrome
Team Collaboration Add a feature

5 Like
Graphical HTTP Client

HTTP Client is a Mac OS X Leopard developer tool for debugging HTTP services by graphically creating and inspecting complex HTTP messages.

Commercial Mac
No features added Add a feature

4 Like
Try It Online (TIO)

TIO is a family of online interpreters for an evergrowing list of practical and recreational programming languages.

Free Open Source Web Self-Hosted
No features added Add a feature

1 Like
GraphicalHttpClient

Graphical Http Client is a utility to help you test and interact with REST-based web services. It is lightweight, easy-to-use, and has the following features: - Set...

Commercial $ $ $ Mac
No features added Add a feature

1 Like
code.reloado.com

Test HTML / JavaScript / CSS snippets with real-time preview. You could also add libraries (jQuery, YUI etc.). Save your work with one click.

Free Web
No features added Add a feature

2 Like
Slowy

Slowy is an OSX app which simulates custom connection's conditions and limits the network traffic. It is created for web developers that work on a local server, to...

Freemium Mac
No features added Add a feature

1 Like