Sound Meter VS Digital Level Meter

Sound Level Meter - You can measure the environmental noise in decibels.

Visual Analyser - A powerful software implementing a Spectrum Analyzer, Oscilloscope, Frequency meter, Distorsiometer, Volt meter and more... plus complete D/A conversion, ZRLC, Impedance meter

AudioTool - Whether you want to make music for the club, or you're aiming to put a few tracks to a film, Audiotool is a website geared towards putting the mixes at your fingertips. Read more about AudioTool.

Youlean Loudness Meter - Find your audio's true perceived loudness to prepare for TV and streaming services.

Spectro - Spectro is a freeware audio file analyzer for windows.

Audacity - Audacity is a free and open-source audio production software suite that includes a surprising array of editing tools and recording systems.