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I have a spreadsheet that contains approximately twelves columns of data (and various rows based on dataset). I need to have custom ap developed that will allow iphone users to open a filtered subset of the data based on criteria from three of the fields. The application will then provide a list activities for the user to select and update. Once an activity is selected, the ap will display check boxes for the user to check started and/or completed. If the activity is started but not finished, the user can enter a remaining duration or expected finish date (with pop-up calendar).
The ap needs to allow multiple users to update the same spreadsheet concurrently. The ap could use BOX or DROPBOX as the location of the spreadsheet (open to other ideas for this process as well).