Both ‘Diet Cokes’ and ‘Coke Zero’ are low calorie soft drinks compared to regular coke. Both have similar ingredients which are carbonated purified water, flavour, artificial sweeteners aspartame, acesulphame potassium, preservative and caffeine.
Diet Coke came on market in 1982; preferred by many in America and became the number one sugar-free drink. Diet Coke is also known as ‘Coca-Cola light’ in some countries and it is the No. 3 soft drink in the world. It is preferred by people who want no calories, but plenty of taste. Diet coke comes in many different flavours such as Black Cherry Cola Vanilla, Cola, Cola Green Tea, Cola Lemon, Cola Lemon Lime, Cola Lime, Cola Orange and Cola Raspberry.
But Coke Zero only offers’ Coca-Cola’ taste with zero calories. It is preferred mostly by young adults and it is sweetened with a blend of aspartame and acesulfame potassium (Ace K).
So overall the only key difference between the two drinks is in the proportions of the ingredients, which actually give different flavour profile.