Versions:
Vayu is a free, open-source desktop application developed by Atharva Kusumbia, currently at version 0.29.1 with 22 versions released to date. It belongs to the API development and testing software category and is available for Windows, macOS, and Linux. The software combines two traditionally separate toolsets in a single local application: a Postman-style API client and a k6-level load-testing engine, the latter implemented natively in C++20 to deliver high-throughput performance. On the request-building side, Vayu provides a full REST and GraphQL request builder that supports collections for organizing endpoints, environments for managing configuration variables across different contexts, and scripting capabilities for extending and automating request workflows. This makes it suitable for developers and testers who need to design, debug, and document API interactions during everyday development. On the performance-testing side, the integrated load tester allows users to push significant traffic against their APIs without relying on an external service or a separate command-line tool, bridging the gap between functional API exploration and load validation within one interface. Because the application runs entirely on the desktop, all data remains on the user's machine rather than being synchronized to a third-party cloud, which can be an important consideration for teams working with sensitive endpoints, internal services, or regulated environments. Typical use cases include building and maintaining API request collections during backend development, testing GraphQL queries alongside REST endpoints, scripting pre-request or post-response logic, switching between environment configurations such as staging and production, and running high-volume load tests to assess API performance and reliability under stress. As an open-source project, Vayu offers an alternative to commercial API platforms for users seeking a local-first tool that unifies request building and load testing without licensing costs or mandatory account registration.
Tags: