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Insomnia REST VS OpenAPI Generator

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

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Flagsmith lets you manage feature flags and remote config across web, mobile and server side applications. Deliver true Continuous Integration. Get builds out faster. Control who has access to new features. We're Open Source. featured
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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.

OpenAPI Generator logo OpenAPI Generator

OpenAPI Generator enables you to generate documentation, clients, and servers from OpenAPI 2.0/3.x documents without hassle.
  • Insomnia REST Landing page
    Landing page //
    2023-10-05
  • OpenAPI Generator Landing page
    Landing page //
    2023-03-01

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.

OpenAPI Generator features and specs

  • Wide Language Support
    OpenAPI Generator supports a broad range of programming languages, which allows developers to generate client libraries, server stubs, API documentation, and other code artifacts across various languages with ease.
  • Customizability
    The tool provides diverse customization options, including custom templates, configuration options, and overrides, enabling developers to tailor the generated code to meet specific project requirements.
  • Active Community
    OpenAPI Generator benefits from an active and engaged community that contributes to continuous improvements, bug fixes, and enhancements, ensuring the tool stays updated with evolving needs and standards.
  • Comprehensive Documentation
    It comes with extensive documentation and a rich set of resources that help users understand how to leverage the tool effectively for their projects.
  • Time-Efficiency
    Automating the generation of API-related code significantly reduces development time and effort, allowing teams to focus on implementing business logic rather than boilerplate code.

Possible disadvantages of OpenAPI Generator

  • Complexity
    Although powerful, OpenAPI Generator can be complex to configure and use effectively, especially for newcomers unfamiliar with OpenAPI specifications and generation nuances.
  • Generated Code Quality
    While the tool generates a significant amount of code, the quality of the generated code might not always match hand-crafted solutions, potentially requiring manual refinements and adjustments.
  • Heavy Dependency
    Relying on a code generator creates a dependency on the tool, which may complicate upgrades over time, especially if custom templates or configurations are heavily used.
  • Learning Curve
    There is a learning curve associated with understanding the OpenAPI specification and how to effectively use the generator, particularly for complex APIs and integrations.
  • Maintenance Overhead
    Keeping up with new releases and ensuring compatibility with updated OpenAPI standards can introduce additional maintenance overhead for teams using the tool extensively.

Insomnia REST videos

+ Add

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

More videos:

  • Tutorial - Insomnia REST Client Tutorial

OpenAPI Generator videos

+ Add

Introducing OpenAPI Generator

More videos:

  • Review - Scaling the Test Coverage of OpenAPI Generator for 30+ Programming Languages - William Cheng

Category Popularity

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Insomnia REST

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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 OpenAPI Generator

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

OpenAPI Generator Reviews

We have no reviews of OpenAPI Generator yet.
Be the first one to post

Social recommendations and mentions

Based on our record, Insomnia REST should be more popular than OpenAPI Generator. 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)

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OpenAPI Generator mentions (42)

  • Using OpenAPI to Automate API Integration With Rapyd's Payment Gateway
    Manually writing API clients can be time-consuming and result in errors. This is where the OpenAPI specification and tools like OpenAPI Generator are helpful. - Source: dev.to / about 2 months ago
  • Define, Generate, and Implement: An API-First Approach with OpenAPI Generator and FlightPHP
    With your API defined, use the OpenAPI Generator to generate your code automatically. The PHP Flight generator — documented here — was provided by the author and, although its status is still marked as "experimental", it has been my production workhorse for over a year. - Source: dev.to / 2 months ago
  • Next-generation web framework Teo, supports Node.js, Python and Rust
    You would use OpenAPI (formerly Swagger) [1] for that, which includes JSONSchema for data types but also adds specs for defining REST apis. There are plenty of generators and other tools that work with OpenAPI [2] [1] https://www.openapis.org/ [2] https://openapi-generator.tech/. - Source: Hacker News / 11 months ago
  • FastAPI Got Me an OpenAPI Spec Really... Fast
    As a result, the following specification can be used to generate clients in a number of different languages via OpenAPI Generator. - Source: dev.to / about 1 year ago
  • How to Automatically Consume RESTful APIs in Your Frontend
    As an alternative, you can also use the official OpenAPI Generator, which is a more generic tool supporting a wide range of languages and frameworks. - Source: dev.to / over 1 year ago
View more

What are some alternatives?

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

Postman - The Collaboration Platform for API Development

swagger.io - Swagger is an open source RESTapi Documentation Tool.

Hoppscotch - Open source API development ecosystem

API Transformer - API Transformer is a powerful solution that enables you to Transform API specifications to any format.

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

Swagger Codegen - Swagger Codegen can reduce the complexities that arise in your build process by providing client SDKs and server stubs for any API you want.

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