Just a thought, PitchTrax has 3 colors, red for a strike, yellow for a foul ball, blue for a ball. I would prefer if they seperated swinging strikes and taken strikes, like red for taken strikes, green for swinging strikes. You could tell right away looking at it if a pitch was a strike because the hitter swung, or if it was a strike because it was called a strike, like if you're not paying attention now you come back, see a pitch off the plate called a strike, was it a bad call or did the hitter swing?
Obviously not a big deal, but if you're making fouls different colors, why not make swinging and taken strikes different too?