Iron is a metal complex whereas ferritin is a protein. 
Ferritin stores iron and provides a balance between iron overload and deficiency while Iron is stored in a ubiquitous protein called Ferritin, which is manufactured by every living organism, including plants and animals.
Iron is needed to help form adequate numbers of normal red blood cells, which carry oxygen throughout the body. Iron is a critical part of hemoglobin, the protein in red blood cells that binds oxygen in the lungs and releases it as blood travels to other parts of the body. Low iron levels can lead to anemia, in which the body does not have enough red blood cells. Serum ferritin-reflects the amount of stored iron in your body; ferritin is the main storage protein for iron inside of cells. Transferrin is the protein that transports iron from the gut to the cells that use it. Ferritin. Ferritin is a protein which is found in cells which is in control of iron. Its function is to store iron and release it when necessary. Iron control is done in a controlled manner inside cells by this protein. By the amount of ferritin in cells, we can predict the amount of iron present. Summary. Iron is a metal complex whereas ferritin is a protein. Ferritin stores iron and provides a balance between iron overload and deficiency. Ferritin is stored inside cells whereas iron is released in the blood and tissues that need it. High levels of ferritin don’t affect the amount of iron in the body. Iron is stored in a ubiquitous protein called Ferritin, which is manufactured by every living organism, including plants and animals. In the human body, the protein’s use is to create a balance between iron overload and iron deficiency.
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what is difference between ferritin and iron