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 from version-controlled files inside VS Code.
Send HTTP requests from version-controlled files inside VS Code.
Local HTTP request authoring, environments and response inspection inside VS Code. Not a managed cloud API platform or automatic script/collection migration.
Requires VS Code and comfort editing request files. No hosted mock service, managed team workspace or full Postman/Insomnia collection-script compatibility. Target APIs may charge for requests; keep secrets out of committed files.
Each comparison covers the workflow described above, rather than every paid feature.