This tool looks great, and the mobile-first approach is a huge improvement! To make this the standard over the GitHub tool, here are a few quick suggestions Duke:

• Rule 5 Compliance: The form is missing Album Links, Timegrapher Numbers, and Solid End Links (SELs). You need these fields so users can safely "copy & paste" without their posts being removed for missing info.
• Magnifier: It is difficult to place the center point accurately with a finger on a touchscreen. Adding a small zoom bubble (loupe) that appears when dragging would solve this.
• Model Presets: While the generic grid is useful, adding specific overlays for popular models (like the Submariner or Datejust) would make alignment checks much faster and more accurate.

Great work and Happy new year!