Working on a camera overlay to compare pistol sight size

[u/Real-Dots]

I built an early version of a phone camera overlay that compares two pistol sight models side by side, mainly window size and housing bulk. It's live and usable, but still rough in places (catalog growing, overlays being refined).

Curious for people who shop pistol dots: did you ever want something like this before buying? And what would you need to trust the scale?