Tilde~Q is a highly accurate Tilt EQ, meant for tone shaping with very broad strokes, rather than surgical corrections.
Tilde~Q is much, much more accurate than comparable EQs offered by other plugin manufacturers that typically employ one simple shelving filter around a specific "centre" frequency. Tilde~Q offers an EQ curve that is virtually perfectly linear over the complete audio spectrum.
The controls on offer, combined with the very low CPU usage, make this your perfect mixing companion, enabling you to make broad strokes to the various tracks in your mix, separating brighter from darker sounds, thereby creating clarity.
One notable use case is shaping the sound of a reverb effect on a dedicated reverb bus: Maybe your favourite reverb doesn't offer low and/or high cut filters, or maybe you feel that the overall tone could be brighter, or darker; Tilde~Q is perfect in this scenario, to cut out the rumble, to tame the high frequencies, and to shape the overall character of the reverb.
For mastering, this is the perfect EQ to quickly make your whole mix brighter or darker in small increments, without the need to be concerned about what specific frequencies to boost or cut. The low cut control comes in handy in mastering when you need to quickly cut out muddiness or rumble.