RedxDev BASE and BASErt RedxDev BASE is a programming interface written in PHP using the database MySQL. Base Projects, or BPs, are applications written for BASE. They are written in PHP, HTML, and some XML. RedxDev BASE provides functions to store data in the database without the database username or password. BPs can be run stand-alone or another application outside or inside of BASE can include it with a script. BASErt is the core of BASE, without anything but the BASE engine. BASErt stands for BASE run time.