Twelve design tricks that companies build into apps, websites and checkouts to get you to spend money you never meant to spend. Not theory, and not a lecture. Every one of them has a name, they're all here, and once you know the names you'll spot them coming before they cost you a dime. We go through bait and switch, confirm shaming, disguised ads, forced continuity, friend spam, hidden costs, misdirection, price comparison prevention, privacy zuckering, the roach motel, sneak into basket, and trick questions. Plus what India's consumer authority is now fining major platforms over, and the four things I do at the checkout screen to keep my money.