Software Alternatives, Accelerators & Startups

Insomnia REST VS API Transformer

Compare Insomnia REST VS API Transformer and see what are their differences

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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.

API Transformer logo API Transformer

API Transformer is a powerful solution that enables you to Transform API specifications to any format.
  • Insomnia REST Landing page
    Landing page //
    2023-10-05
  • API Transformer Landing page
    Landing page //
    2023-09-02

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.

API Transformer features and specs

  • Cross-Platform Compatibility
    API Transformer allows conversion of API descriptions across multiple formats like Swagger, OpenAPI, RAML, API Blueprint, etc., enabling cross-platform compatibility.
  • Time-Saving
    Automates the tedious task of manually converting API specifications, significantly reducing development time and effort.
  • Ease of Use
    The service is user-friendly, offering an intuitive interface and seamless integration through a straightforward process.
  • Support for Multiple Formats
    Supports a wide range of API description formats, ensuring that it can handle a diverse set of input and output types.
  • Online Accessibility
    As a cloud-based solution, API Transformer is accessible from anywhere, making it highly convenient for distributed teams.

Possible disadvantages of API Transformer

  • Dependency on External Service
    Relying on a third-party service for API transformation might introduce dependencies that could affect project timelines if the service experiences downtime.
  • Cost
    While there might be a free tier available, extensive usage or professional features might require a subscription, which could lead to additional costs.
  • Privacy Concerns
    Using an online service for API transformation could raise privacy concerns, especially when dealing with sensitive API documentation.
  • Potential Learning Curve
    Although designed to be user-friendly, new users might still face a learning curve in understanding the full range of features and capabilities.
  • Limited Offline Functionality
    As a primarily online tool, its functionality might be limited or non-existent without an internet connection.

Insomnia REST videos

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

More videos:

  • Tutorial - Insomnia REST Client Tutorial

API Transformer videos

No API Transformer videos yet. You could help us improve this page by suggesting one.

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Category Popularity

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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 API Transformer

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

API Transformer Reviews

We have no reviews of API Transformer yet.
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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)

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API Transformer mentions (0)

We have not tracked any mentions of API Transformer yet. Tracking of API Transformer recommendations started around Mar 2022.

What are some alternatives?

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

Postman - The Collaboration Platform for API Development

OpenAPI Generator - OpenAPI Generator enables you to generate documentation, clients, and servers from OpenAPI 2.0/3.x documents without hassle.

Hoppscotch - Open source API development ecosystem

Widdershins - Widdershins is an open-source, easy to use Semoasa/ OpenAPI/ AsyncAPI/ definition to ReSlate/Slate compatible markdown released under the MIT License.

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

AutoRestCodeGenerator - AutoRestCodeGenerator is an open-source OpenAPI (f.k.a Swagger) Specification code generator released under the MIT License that supports Python, C#, TypeScript, PowerShell, Go, Node.js, and Java.