There are apps, but they are incredibly inaccurate. For starters, they don't recognize the food right. Usually you have to pick from a menu of 10 items. Then th

There are apps, but they are incredibly inaccurate. For starters, they don't recognize the food right. Usually you have to pick from a menu of 10 items. Then they have to estimate a 3D quantity (volume) from a 2D image, then they have to estimate the density... the amazing thing though is despite all this, they are still more accurate than recall diaries.