You can either design your own PCB or handwire. I handwire because it’s cheaper, and I don’t have to order min 5 pieces and have extra lying around after.

Look up QMK, you can do a million different things with the firmware.

They can be as custom as you want! I’ve made a few by coming up with a layout I want, making the 3D model for the case, 3D printing it out and handwiring it up myself, then doing the firmware for it.

You can make something that once only existed in your head into something you use every single day!

On iOS you’ll find them in TestFlight, for android on their githubs