Top Rest Client Alternatives for API Development and Testing
Rest Client is a feature-rich REST client for developers, designed to debug and test RESTful web services. It supports various HTTP methods like GET, POST, PUT, DELETE, HEAD, PATCH, COPY, SEARCH, and OPTIONS, along with features like simultaneous views of requests, responses, and browser, handling raw data, multipart forms, and binary responses. However, developers often seek a Rest Client alternative that might offer different integrations, specialized features, or a more tailored user experience. This article explores some of the best alternatives available for API development and testing.
Top Rest Client Alternatives
Whether you're looking for a free, open-source, or commercial solution, there's a perfect Rest Client alternative out there to streamline your API workflow. Here are some of the leading contenders:

Postman
Postman is a highly popular and comprehensive Rest Client alternative, offering extensive functionality for API development and testing. It's a freemium tool available across multiple platforms including Mac, Windows, Linux, Web, and Chrome OS. Postman stands out with features like API development, REST API support, API management, CI/CD integration, and a user-friendly graphical interface, making it a robust replacement for Rest Client.

Fiddler
Fiddler is a free web debugging proxy for Windows that logs all HTTP(S) traffic between your computer and the Internet. As a Rest Client alternative, Fiddler is excellent for HTTP monitoring and debugging, providing a powerful way to inspect and modify web traffic. While not a direct API client, its debugging capabilities make it invaluable for understanding network interactions.

Insomnia REST Client
Insomnia REST Client is a powerful and lightweight Rest Client alternative, available as freemium and open-source software for Mac, Windows, and Linux. It boasts features like cookie management, environment variables, code generation, authentication, request chaining, GraphQL support, and cloud sync, providing a modern and efficient environment for API development.

Google Chrome Developer Tools
Integrated directly into the Google Chrome browser, the Google Chrome Developer Tools offer a free and open-source Rest Client alternative for Mac, Windows, Linux, and Chrome. While primarily for web application debugging, its network tab and console can be used to inspect and send HTTP requests, providing a convenient, built-in solution for quick API interactions and debugging.

Firefox Developer Tools
Similar to Chrome's offerings, Firefox Developer Tools are a free, open-source Rest Client alternative available for Mac, Windows, and Linux. They provide an integrated environment to examine, edit, and debug HTML, CSS, and JavaScript, with robust network inspection capabilities that allow developers to monitor and interact with HTTP requests and responses directly within the browser.

Paw
Paw is a commercial Rest Client alternative exclusively for Mac users, known for its elegant interface and powerful features for crafting and testing HTTP requests. It allows users to easily set up headers, URL parameters, form-encoded POST key-values, and raw text, offering easy-to-read responses and supporting request chaining, making it a premium choice for Mac developers.

soapUI
soapUI, from Eviware, is a free and open-source Rest Client alternative for Mac, Windows, and Linux, primarily focused on functional testing of web services, including SOAP-based and RESTful web services. Its intuitive nodes and extensive testing capabilities make it an excellent choice for complex API testing scenarios, going beyond basic request sending.

Advanced REST Client (ARC)
Advanced REST Client (ARC) is a free and open-source API testing tool and a great Rest Client alternative available for Mac, Windows, Linux, Chrome OS, and as a Chrome extension. It allows web developers to create and test custom HTTP requests with full headers control, offering a web tool and Electron-based application for robust REST API interactions.

Postwoman
Postwoman (now Hoppscotch) is a free, open-source, and self-hosted API request builder that serves as an excellent Rest Client alternative. Available as a web application, it helps developers create requests faster with features like ad-free experience, cross-browser testing, Websocket streams, GraphQL API support, and cross-platform compatibility, making it a highly flexible tool.

RESTer
RESTer is a free and open-source Rest Client alternative available as a Firefox and Chrome extension for Mac, Windows, and Linux. It provides a straightforward interface for interacting with web services, offering features like API management, project organization, and variable support, making it a convenient browser-based solution for quick API calls.
With a variety of powerful tools available, finding the perfect Rest Client alternative for your specific API development and testing needs has never been easier. We encourage you to explore these options and choose the one that best aligns with your workflow, platform preferences, and feature requirements.