# Open-source Alternatives
Open-source alternatives offer extensive customization through public code access. Most of them provide free / paid cloud service. Some might require self-hosting to use.
Hoppscotch
Open-source
A lightweight, fast, and sleek API request builder and documentation tool for developers who value simplicity and performance.
Hoppscotch is an open-source API development platform that provides a clean, minimalist interface for testing APIs, with support for REST, GraphQL, and WebSocket protocols. The platform offers a fast, browser-based environment for sending requests, organizing collections, and testing API endpoints without the overhead of heavy desktop applications.
- API testing: Quick testing and debugging of API endpoints.
- Development workflow: Rapid API development and iteration.
- Team collaboration: Sharing and collaborating on API collections.
Bruno
Open-source
A modern, Git-integrated API testing client built for seamless version control in collaborative environments.
Firecamp
Open-source
A Multi protocol API development platform designed to simplify and streamline the process of testing, debugging, and developing APIs
Firecamp is a ,Multi protocol API development platform designed to simplify and streamline the process of testing, debugging, and developing APIs. It supports REST, GraphQL, WebSocket, and gRPC protocols. It streamlines testing and documentation processes, allowing teams to create and share API collections effortlessly.
- Team API development: Enhance collaboration among team members while developing APIs.
- Cross-protocol testing: Test APIs across various protocols without switching tools.
- Documentation creation: Generate comprehensive API documentation for better communication.
HTTPie
Open-source
A powerful API client primarily designed for command-line use, offering a fast and intuitive way to test APIs with a clean, human-readable interface.
HTTPie is a developer-friendly API client that excels in command-line usage, providing a streamlined way to send HTTP requests. It focuses on simplicity and readability, making API testing more efficient by displaying responses in a structured, easy-to-read format. HTTPie supports REST, GraphQL, and other APIs, making it an excellent tool for developers who prefer a terminal-based workflow. While its core strength lies in the command-line interface, HTTPie also offers a desktop version for those who need a graphical interface.
- Quick API testing: Rapid testing of APIs directly from the command line.
- Terminal-based development: Ideal for developers who prefer working in a terminal.
- API automation: Integrating API requests into scripts or automation workflows.
Scalar
Open-source
An offline-first API client built with OpenAPI in mind, designed to help developers manage, test, and document APIs seamlessly across multiple platforms.
Scalar provides a minimalist interface for API testing, supporting various development environments like macOS, Windows, and Linux. Its key selling point is its tight integration with the OpenAPI specification, allowing users to import and sync OpenAPI files for smooth documentation, API testing, and SDK generation. Scalar also provides offline functionality by default, ensuring reliable use even when not connected to the internet.
- API testing: Rapidly test API endpoints across RESTful APIs, handling cookies, headers, and more.
- OpenAPI-based development: Streamline API documentation and testing workflows using OpenAPI files.
- Offline API client: Ideal for developers who require offline functionality for testing.
SoapUI
Open-source
A powerful, open-source tool for API functional, security, and load testing, supporting a wide range of protocols and services.
SoapUI is an open-source tool designed for testing APIs, offering comprehensive solutions for both REST and SOAP services. It provides developers and testers with the ability to validate functionality, security, and performance through easy-to-create test cases, without needing deep technical expertise. SoapUI's intuitive interface supports a wide range of protocols and offers both manual and automated testing capabilities.
- API Functional Testing: Validate API endpoints and workflows in both REST and SOAP environments.
- Load and Performance Testing: Simulate real-world traffic to assess system behavior under load.
- Security Testing: Proactively scan for vulnerabilities to protect APIs from attacks.
- Automation in CI/CD Pipelines: Use command-line tools to integrate testing into continuous integration workflows.
Insomnia
Open-source
A robust and flexible API Testing tool with customizable workflows
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