Hoppscotch
hoppscotch.ioAPIs
Open-source, runs in a browser tab, and loads instantly — great when you just need to fire a request.
Other products from APIs
The default place to build, test, and share API requests — everyone's used it, and for good reason.
A cleaner, faster API client than Postman if you don't need the enterprise bloat.
The OpenAPI tooling everyone standardized on for writing specs that double as live docs.
Design, mock, test, and document your API in one tool instead of stitching together five.