Siren – Cross-platform API endpoint testing tool

Summary: Siren is a local-first, cross-platform application for testing API endpoints without requiring sign-up. It supports HTTP request history, collections, variables, secret management, plugins, and cURL.

What it does

Siren enables users to test API endpoints with features like request history, environment variables, secret management via native OS and 1Password, and plugin extensibility.

Who it's for

Developers and testers needing a local, no-account tool for managing and testing API requests.

Why it matters

It provides secure, extensible API testing with local data storage and integrated secret management.