Loudness control LUFS level adjustments Is there a tool that can adjust the loudness level of a video? 

for example I need to make the loudness to be -23 LUFS with max deviation of 0.5 lu.

is there a simple tool/cloud service that doesn't cost too much, that can do this ?
FFmpeg's loudnorm filter can be used. Basic syntax is

ffmpeg -i in.mp4 -c:v copy -af loudnorm=I=-23:LRA=1 -ar 48000 out.mp4


The loudness range (LRA) should be 2 x max deviation.

Also see the ebur128 filter for measuring loudness.