Send API requests, inspect responses and organise request collections.
Free and open source (MIT licence per GitHub). Web, desktop and CLI clients, with cloud, offline and self-hosted routes.

Developer tools
Send HTTP requests and inspect API responses from the terminal.
Send HTTP requests and inspect API responses from the terminal.
Build and send API requests with human-readable syntax from the terminal instead of a paid Postman or Insomnia plan. Shared team collections, monitors, mock servers and GUI collaboration are outside this slice.
CLI-first: no Postman-style shared cloud workspace — collections live in shell sessions, files and CI rather than a team UI, and monitors, mock servers and GUI collaboration are outside this free CLI. Command history can hold credentials if you are not careful.
Each comparison covers the workflow described above, rather than every paid feature.