Sparkling low calorie soft drink with plant extracts with sweeteners. A low-calorie sparkling soft drink with no sugar, no calories and no caffeine.The great refreshing taste of Diet Coke with no caffeine. Add some sparkle to your day without the caffeine, with a crisp, refreshing Diet Coke Caffeine Free!. Diet Coke is a sugar free, low calorie soft drink. Caffeine Free. No Sugar. No Calories. Contains plant extracts and sweeteners. Contains a source of Phenylalanine. Serve over ice with a slice of lime. Keep cold in the fridge.