Web accessible system for providing services to the members of a health care sharing organization through a web-accessible portal and mobile device application for: health care sharing organization administration; health care expense allocation among the health care sharing organization's members; tracking member payments covering the heath care expenses of other members; providing member-to-member communication regarding the sharing of healthcare expenses between members of the health care sharing organization; providing healthcare cost containment; and providing for the purchase of health care services for members of the health care sharing organization