A toast: “Here’s to the apps that never fail, to measure your BAC and perhaps keep you out of jail. Some do it with zest, some do it better than the rest, some don’t do much at all and therefore get ranked low in our AppGuide!” Ok, my toast slipped at bit there at the end, but with these helpful apps hopefully you won’t be slipping too much during your next night out. And if you are, you will at least be able to realize you need a ride home. Please note that none of the apps in this review claim to be 100 percent accurate. Please use common sense when drinking and don’t drink and drive.