u/Effective-Maybe-1797

I sing in a rock band. I keep getting ads online for Better Voice Vocal Trainer which is about $50
https://bettervoice.store/products/vocal-trainer

But I also see something like this on Amazon for $6
https://a.co/d/0gdMvNB6

Would they do the same thing? Does the $6 one help with singing? Is there any big difference to justify paying $50 instead of $6?