Software Alternatives, Accelerators & Startups

Insomnia REST VS Fiddler

Compare Insomnia REST VS Fiddler and see what are their differences

Insomnia REST logo 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.

Fiddler logo Fiddler

Fiddler is a debugging program for websites.
  • Insomnia REST Landing page
    Landing page //
    2023-10-05
  • Fiddler Landing page
    Landing page //
    2023-09-19

Insomnia REST features and specs

  • User-Friendly Interface
    Insomnia REST features a clean and intuitive user interface that makes it easy to create, send, and manage API requests without a steep learning curve.
  • Support for Multiple Protocols
    In addition to REST, Insomnia supports GraphQL and gRPC, making it versatile for developers working with different API protocols.
  • Environment Management
    Insomnia allows you to create and manage multiple environments, making it easier to switch between staging, development, and production settings.
  • Custom Plugins and Themes
    Insomnia supports custom plugins and themes, allowing users to extend its functionality and personalize the interface to suit their workflow.
  • Collaboration Features
    With Insomnia Teams, users can collaborate and share API requests, environments, and other resources, enhancing team productivity.
  • Cross-Platform Availability
    Insomnia is available on multiple platforms, including Windows, macOS, and Linux, providing flexibility for users on different operating systems.

Possible disadvantages of Insomnia REST

  • Resource Heavy
    Some users have reported that Insomnia can be resource-intensive, leading to potential performance issues on lower-end machines.
  • Limited Free Features
    While Insomnia offers a free tier, some of the more advanced features, such as team collaboration and sync capabilities, require a paid subscription.
  • Steeper Learning Curve for Advanced Features
    Although the basic functionalities are user-friendly, mastering the more advanced features might require a steeper learning curve.
  • Dependency on Electron
    Since Insomnia is built on Electron, it might consume more memory and disk space compared to native applications.
  • Complex Plugin System
    While the plugin system is powerful, it can be complex and challenging for users who are not familiar with JavaScript and Node.js.

Fiddler features and specs

  • Comprehensive Debugging
    Fiddler allows for detailed HTTP/HTTPS traffic inspection and debugging, making it invaluable for diagnosing and troubleshooting web applications.
  • Cross-Platform Compatibility
    Works on Windows, macOS, and Linux, providing flexibility to developers working in different environments.
  • Custom Scripting
    Supports custom scripts using FiddlerScript, enabling advanced functionalities and automation of repetitive tasks.
  • User-Friendly Interface
    Provides an intuitive and easy-to-use interface that helps users navigate and utilize its features effectively.
  • Web Debugging Proxy
    Acts as a proxy server that captures traffic between your computer and the internet, which is essential for debugging web applications.

Possible disadvantages of Fiddler

  • Learning Curve
    May require a period of learning and adaptation for users new to the tool or those who are not familiar with HTTP/HTTPS concepts.
  • Resource Intensive
    Can be resource-heavy, especially when capturing and storing large amounts of traffic data, which may slow down your computer.
  • Limited Mobile Support
    Although it can work with mobile devices, setup can be cumbersome and less straightforward compared to desktop debugging.
  • Documentation and Community
    While there is good documentation available, it may not cover all niche use cases, and community support can be hit or miss.
  • SSL Decryption
    Decrypting HTTPS traffic requires additional setup and can introduce security risks if not handled properly.

Insomnia REST videos

3 Reasons to use Insomnia REST Client in your Exploratory API Testing

More videos:

  • Tutorial - Insomnia REST Client Tutorial

Fiddler videos

Fiddler On The Roof, Faith on Film review

More videos:

  • Review - FIDDLER ON THE ROOF WEST END REVIEW | Georgie Ashford
  • Review - Fiddler on the Roof Review

Category Popularity

0-100% (relative to Insomnia REST and Fiddler)
API Tools
100 100%
0% 0
Developer Tools
80 80%
20% 20
Security
0 0%
100% 100
APIs
100 100%
0% 0

User comments

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Reviews

These are some of the external sources and on-site user reviews we've used to compare Insomnia REST and Fiddler

Insomnia REST Reviews

Top 20 Open Source & Cloud Free Postman Alternatives (2024 Updated)
Product Introduction: Insomnia is a powerful open-source API client designed for simplicity and efficiency and works great as a postman alternative. It supports REST, GraphQL, and gRPC, making it versatile for various API types.
Source: medium.com
Best Postman Alternatives To Consider in 2025
It is a free, open-source platform that boasts a user-friendly interface and robust features like environment and collection management, code snippets, and test automation. Compared to Postman, Insomnia offers a lighter footprint and a more customizable workspace.
Postman Alternatives for API Testing and Monitoring
Insomnia is a user-friendly tool for API development and testing. Insomnia allows creating and sending HTTP and REST requests, like GET, POST, PUT, DELETE, and more. Users can view API responses, including status codes, headers, and body. This enables understanding how the application handles different response scenarios, for efficient debugging.
Top 10 HTTP Client and Web Debugging Proxy Tools (2023)
Insomnia REST is the best alternative for Postman. It has more than 350 open-source plugins, plus GraphQL built-in with multiple protocol support. Since GraphQL is an added value, you can fully automate the entire lifecycle of APIs, build and debug them efficiently and with ease.
15 Best Postman Alternatives for Automated API Testing [2022 Updated]
Insomnia by Kong enables you to deliver high-quality APIs through collaboration. This postman alternative also includes testing suites, which allow you to create functional tests and centralize APIs. With this platform’s streamlined API client, sending GraphQL, REST, and SOAP requests are simple. Defining variables such as authentication credentials allows you to manage...
Source: testsigma.com

Fiddler Reviews

Top 10 HTTP Client and Web Debugging Proxy Tools (2023)
Next right up is Fiddler. It is one of the most powerful and popular web debugging proxy tools. it can debug and troubleshoot endlessly. What you would come to like is that Fiddler is free and has lots of plug-ins you can use. Knowing it captures, analyze and record HTTP traffic between your device and the server, handling any embedded issues becomes easy.
12 HTTP Client and Web Debugging Proxy Tools
Fiddler is a cross-platform web debugging proxy. It can help manipulate web sessions, inspect HTTPS traffic, and monitor traffic between your computer and the Internet.
Source: geekflare.com
Comparing Charles Proxy, Fiddler, Wireshark, and Requestly
Fiddler is another popular web debugging proxy that runs on Windows. It provides developers with a range of features, such as HTTP/HTTPS traffic capturing, request modification, and performance testing. In addition to these features, Fiddler has a scripting engine called FiddlerScript, which allows for customizing the tool’s behavior. This scripting engine enables developers...
Source: dev.to
73 Best SEO tools 2021 – The Most Epic List You Shouldn’t Miss
The answer is simple – if you are looking for an SEO site tool that won’t freeze your browser (a common problem with most plugins), then Fiddler is your ultimate debugging tool.

Social recommendations and mentions

Based on our record, Insomnia REST seems to be more popular. It has been mentiond 129 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.

Insomnia REST mentions (129)

View more

Fiddler mentions (0)

We have not tracked any mentions of Fiddler yet. Tracking of Fiddler recommendations started around Mar 2021.

What are some alternatives?

When comparing Insomnia REST and Fiddler, you can also consider the following products

Postman - The Collaboration Platform for API Development

Charles Proxy - HTTP proxy / HTTP monitor / Reverse Proxy

Hoppscotch - Open source API development ecosystem

RapidAPI for Mac - Paw is a REST client for Mac.

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

soapUI - SoapUI Pro is one of the most prominent API testing platforms around, allowing developers to quickly prototype the functions of their apps and get them to market with little hassle.