As one of the creators, I can recommmend https://kreya.app. It is not open source (like Postman), but has a strong focus on privacy and also stores the data locally.
As it has more powerful features (IMO) than most alternatives listed here, I am a little disappointed that it isn't mentioned more often.
Kreya is the only alternative I've used that prioritizes gRPC support (along with REST). Regardless of source availability, thank you for creating this!
Any chance this can be made available via homebrew? Also, are there telemetry settings I can configure? I frequently work in HIPAA and DoD environments, so the less telemetry tools send the happier those sysadmins are.
As it has more powerful features (IMO) than most alternatives listed here, I am a little disappointed that it isn't mentioned more often.