Every QR generator lets you pick a pretty color. None tell you the code won't scan. nwnay scores your code server-side on contrast and density. Pick our own brand pink and it drops to 34/100 with a plain warning. Pick black and it's 96. You see that before the print shop does. The code encodes a short link, never the destination — so a printed poster can point somewhere new, forever, without reprinting. 33 destination types. Scans counted by hour, city and country. The IP is never stored.