As @rigrig says, widgets/boot code apps are the best place for this (and things like it) since they don't take up space/time if not installed, and can also apply for all apps
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
As @rigrig says, widgets/boot code apps are the best place for this (and things like it) since they don't take up space/time if not installed, and can also apply for all apps