[yurishimo]

Can't comment on the tool itself, but the website does not render correctly on a Macbook with the 1512x982 resolution ("Default" scaling on a 14" M3 MBPro). The left side is cut off unless I zoom out to 80% and I have to scroll right to see the content on the other side.

[HenryBemis]

Same on Win10, latest Firefox, when I snap-left and make my FF take only half-screen 1920:2 = 962x1080, 'stuff' are off-screen in both left and right. I have to zoom out to 50% to see the full content.

[xprn]

Same on anything resembling a mobile device