If E-Sys Ultra is a scalpel, BimmerUtility (BU) is a multi-tool. It represents a paradigm shift toward "standalone" coding that doesn't strictly require the bulky E-Sys software to perform daily tasks.
Bimmerutility Discussion - BMW M3 and BMW M4 Forum - Bimmerpost esys ultra vs bimmerutility updated
includes an integrated ISTA-like diagnostic screen but is clunky. You can read fault codes, clear them, and run some diagnostic routines (battery registration, steering angle reset). Live data is available but not user-friendly. If E-Sys Ultra is a scalpel, BimmerUtility (BU)