Cronometer is an excellent tool for calorie, macronutrient, and micronutrient tracking. They utilize a vast database of nutritional data of various foods, and the website/app is free of cost. It is one of the best nutrition tracking tools with it being easy to operate, its vast database, informative visuals on nutrients, and it being free of cost. You can pay for a premium account to access more features, but all of the main/necessary features are free of cost.