Bitter

Bitter shows how many of the available bits are being used by the audio signal, reports clipping samples, and estimates when digital-to-analog conversion would cause inter-sample clips. Typical uses for a bitscope include: verifying that a render dither is working properly; verifying that a particular plugin is not reducing the signal bit depth; testing for faulty audio source data.
Check for Intersample Clipping that may appear during digital-to-analog conversion
Detailed display of the usage density of each bit
Reveal the bitrate of the digital signal, which may well differ from that of the file’s bitrate or your DAW’s audio engine bitrate
Display the audio sample rate
http://www.stillwellaudio.com/plugins/bitter/