Spectralissime

Spectralissime can be used to analyze audio frequencies. This stand-alone spectrum analyzer captures and analyzes signals from your input device and it displays its frequencies with a great degree of accuracy. It lets you make a wide range of fine tweaks, which enables you to study and understand all sorts of audio phenomena better.

The software is distributed as donationware, meaning that you can use it for free, without any functionality restrictions and you can pay for it what you want, when you want. It can be used on any modern Windows version and it shouldn't take more than a minute to install, even on older machines.

The spectrum analyzer takes up most of the user interface. If you have a microphone or other audio input devices plugged in, the software will use it immediately and display all the frequencies and amplitudes. It has to be mentioned that Spectralissime is quite sensitive. Even with a cheap microphone, it will pick up sounds as low as -84 dB.

Though its main purpose is to display a frequency analysis, the software places a few simple, but useful features at your disposal. You can move the mouse cursor over the analyzer if you want to measure a signal precisely. Additionally, you can increase or decrease the timing, if you want more time to observe the bars in the analysis, set the software to different octaves and more.

Spectralissime supports multiple audio sources. Besides a simple microphone, you can also set it up for VBAN streams. Furthermore, you can connect various output devices as well, for better signal monitoring.

A high level of accuracy is exactly what you can expect when measuring audio frequencies with Spectralissime.