I use Bruno. I forget what Insomnia did that irritated me, but Bruno is the closest I've found to a dumb client that doesn't pester me for an account.

Yeah it got bought by Kong a while back, and they're definitely not a great company, but the application itself still seems pretty OK.

I really like that you can paste a curl in to setup a new request.

This is definitely the type of app that some AI agent could cobble together pretty quickly, so I don't know why Postman etc thinks they have enough of a moat to keep enshittifying their product.