OpenAPI Devtools VS Insomnia REST

Compare OpenAPI Devtools VS Insomnia REST and see what are their differences

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OpenAPI Devtools

Effortlessly discover API behaviour with a Chrome extension that automatically generates OpenAPI specifications in real time for any app or website.

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.

Not present

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2023-10-05

OpenAPI Devtools

Website: github.com
Pricing URL: -
$ Details: -

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Insomnia REST

Website: insomnia.rest
Pricing URL: Official Insomnia REST Pricing
$ Details
Startup details
Country: United States

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OpenAPI Devtools features and specs

No features have been listed yet.

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.

Analysis of OpenAPI Devtools

Overall verdict

OpenAPI Devtools is a well-regarded free and open-source browser extension that automatically generates OpenAPI specifications by observing network traffic, making it a genuinely useful tool for developers working with undocumented or evolving APIs.

Why this product is good

Automatically generates OpenAPI 3.1 specifications by capturing and analyzing real network requests, eliminating tedious manual documentation
Free and open-source, so there are no licensing costs and the community can inspect, contribute to, and trust the codebase
Integrates directly into browser developer tools, fitting naturally into existing developer workflows
Intelligently merges multiple requests to the same endpoint to infer parameter types and response schemas
Useful for reverse-engineering and understanding third-party or internal APIs that lack proper documentation

Recommended for

Developers who need to document existing or undocumented APIs quickly
QA engineers and testers who want to understand API behavior through real traffic
Teams integrating with third-party APIs that lack complete specifications
Backend and frontend developers working on projects without maintained OpenAPI specs
Anyone reverse-engineering or exploring API endpoints during development or debugging

Analysis of Insomnia REST

Overall verdict

Insomnia REST is an excellent choice for developers who need a robust and intuitive tool for API development and testing. Its comprehensive features and ease of use make it a competitive option alongside other popular API clients.

Why this product is good

Insomnia REST is widely regarded as a powerful tool due to its user-friendly interface, extensive plugin ecosystem, and support for multiple authentication protocols. It allows users to easily build, debug, and test RESTful APIs with features like environment variables, code generation, and response validation. Moreover, its compatibility with GraphQL and gRPC makes it versatile for modern development needs.

Recommended for

API Developers
Software Testers
Backend Engineers
Technical Leads
Anyone involved in RESTful API development and testing

OpenAPI Devtools videos

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Insomnia REST videos

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

Category Popularity

0-100% (relative to OpenAPI Devtools and Insomnia REST)

OpenAPI Devtools

Insomnia REST

APIs

5 5%

APIs

95% 95

API Tools

2 2%

API Tools

98% 98

Developer Tools

3 3%

Developer Tools

97% 97

CMS

100 100%

CMS

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 OpenAPI Devtools and Insomnia REST

OpenAPI Devtools Reviews

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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.

Source: www.hypertest.co

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.

Source: www.blazemeter.com

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.

Source: www.bestproxyreviews.com

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

Social recommendations and mentions

Based on our record, Insomnia REST seems to be more popular. It has been mentiond 134 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.

OpenAPI Devtools mentions (0)

We have not tracked any mentions of OpenAPI Devtools yet. Tracking of OpenAPI Devtools recommendations started around Jun 2025.

Insomnia REST mentions (134)

Postman's New Pricing Is a Trap; Here Are the Alternatives
Apidog offers 4 users free with unlimited everything. Bruno has built a passionate community around privacy-first API testing. Insomnia continues to improve with strong multi-protocol support. - Source: dev.to / 5 months ago
The Ultimate Guide to Offline API Testing: 10 Tools That Work Without Internet
Insomnia balances professional-grade features with strong offline capabilities. Its Scratch Pad and Local Vault features ensure sensitive data remains on your local machine while providing comprehensive protocol support. - Source: dev.to / 9 months ago
Postman which I thought worked locally on my computer, is down
I ditched Postman for Insomnia (Open source) after Postman refused to adhere to customers to disable auto-updates for 6 years+. I checked on their GitHub issue tracker and it turns out, the solution was to upgrade to their "Enterprise plan". https://github.com/postmanlabs/postman-app-support/issues/6999#issuecomment-3424362009 So, I said fuck it and switched to a real, open source alternative, Insomnia, instead:... - Source: Hacker News / 9 months ago
How to Design a RESTful API with CRUD Operations
Postman and Insomnia provide user-friendly interfaces for manual and automated API testing, while testing libraries like Jest, Mocha, and pytest support programmatic tests. - Source: dev.to / 11 months ago
Sending SMS Messages with PHP
To send the message, you’ll want an HTTP tooling client that makes it easy to send POST requests - I’ve opted for Kong’s Insomnia but you could also use Postman or even a raw cURL request. - Source: dev.to / 11 months ago