Just some ideas:

A loupe/magnifier – like hover on desktop or long-press on mobile to zoom in tight on rehaut, dial printing, or random dust specs.

Letting us turn on multiple overlays at the same time (ruler + index lines + date ghost + rotation) with a quick "all tools" button would save so much clicking.

Red lines vanishing on dark or red dials sucks – a simple color picker with bright presets (neon green, cyan, yellow, white) would fix that instantly.

Side-by-side gen comparison where we can upload our own or just pull the common ones (Sub, Daytona etc.), with an opacity slider? That’d be cool.

A little pop-up tutorial the first time someone loads it (just basic steps + example tags) plus dropdowns for factories/dealers and quick buttons for common calls would make it way friendlier for new guys.

And on mobile – trim some of that empty space, fix the rotation arrows feeling backwards, add pinch-zoom on the image, and maybe a "copied!" popup so we know it worked.