I see people claim R 128 compliance and EBU mode compliance. What's the difference?
 

Compliance with EBU R 128 means working with a target loudness of -23 LUFS, a maximum true peak level less than -1 dBTP, and using loudness range as a guide. So, a programme can be compliant, or a loudness process, used to normalize programmes to meet the target level and treu peak requirements, could be compliant.

EBU mode specifies integration times and scales for a meter based on ITU-R BS.1770-2. A meter can claim to be EBU mode if it offers the 3 integration times of 400ms, 3s, and "start to stop" integrated, and uses one of the permitted absolute or relative +9 or +18 scales defined in EBU Tech 3341, and measures loudness range as defined in EBU Tech 3342.