Hoppscotch

Hoppscotch (formerly Postwoman) is a lightweight, open-source, web-based API client built as a Progressive Web App (PWA). It emphasizes speed, simplicity, and privacy by running directly in your browser with optional local data storage. It provides core functionality for making requests to REST, GraphQL, WebSocket, and other endpoints with a clean, minimalist interface.

Being web-based, it requires no installation and works across platforms. Its open-source nature allows for self-hosting. Hoppscotch is ideal for developers who need a quick, no-fuss tool for sending API requests, especially when working on shared machines or preferring not to install desktop software. It serves as an excellent, privacy-focused alternative for basic API interaction and testing.