A phone app called Lumenate claims to alter the brain’s rhythms (2021)
I'm not sure if this is related, but one time while tripping balls, we got a kaleidescope and put up to a CRT that was displaying only static. Looking through it was the craziest feeling that I had ever gotten while tripping. We even filmed it with our phones and watched it again and it did the same thing. It was like we all got sucked into the visual. You could almost feel it pulling you in. But it created other crazy visual feelings too. You could see the individual RGB pixels in the CRT all lighting up randomly. Highly recommend if you're gonna trip balls. Haven't tried it sober though to know if it could have the same effects.