“The cat's purr, without the allergy

Cuddling up with a purring cat is certainly a relaxing experience. Scientific studies have shown that cat owners have lower blood pressure and can live longer than humans who don't own pets![…]”

https://mynoise.net/NoiseMachines/catPurrNoiseGenerator.php

“The sound of a purring cat is one of the most comforting sounds available and can help soothe and calm you down when you're feeling stressed. Naturally, it's not just the sound that is important, but it's also the presence of the warm cuddly cat. Purrli tries to recreate both the sound and the presence of your very own virtual cat through a custom sound engine modelled after real purrs.[…]”

https://purrli.com/