It may sound a bit hacky, but there’s a web interface that you can use to control kodi from any other device on your network. Just enter the address and a logon that you set up and presto. There’s a default interface, but you can download some custom ones through the add-ons browser. It functions as a remote, plus you can scroll through your collection on your tablet/phone/laptop while watching/listening to something else on your tv. The main advantage over an app is that it will work on all of your devices through a web browser.