Apps similar to Resonance API Client include Bruno, which is open source with a free version. Other options are Postman, Insomnia REST Client, Yaak and Hoppscotch. There's no shortage of API Clients like Resonance API Client, with more than 50 alternatives for Mac, Windows, Linux, the web and self-hosting.
Free browser-based OpenAPI editor from Postman. Design or import a Swagger 2.0, OpenAPI 3.0, or OpenAPI 3.1 spec (YAML or JSON) and see live documentation with inline validation as you type. No signup, no install. Part of Postman's suite of free developer tools at postman.
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Humlix shows you an easy way of generating tests for your web APIs. All you need to do is create a test request using the test request builder within Humlix and give an example of how your endpoints look and what type of data they want.
Build and maintain your APIs with Less downtimes, Fewer support tickets, Faster time to resolution and always up to date insights into your APIs.
