Are there any Auto-Tune Devices?

I was looking for selection of them but could only find Platform Apps/Programs/Software & desktop applications that required subscription services (w/ a Plan & Pricing) I just want a Plug-in apparatus, device, equipment, gadget, gear, mechanism, tool, etc. It’s my first time buying one you see what I’m trying to say here is their device of a specific brand I should know of that’s like that