/vr/ - Retro Games

Is there a website that can display a correctly-sized silhouette of a smaller screen on my laptop?
Like something that lets me select a custom screen size + aspect ratio, and shows it (exactly at its irl size) by detecting the size of my monitor.

I just want to know how big some of those devices really are.
Retrosizer is good for comparisons but it's not really useful in my case.