Application for the serious recurve target archer who likes to have an arrow database and spine selection table (for a wide varriety of arrrowshafts) available anywhere. The database contains lots of usefull information about a.o. spine, weight, diameter of different manufacturers and shafts including Easton, Carbon Express, Gold Tip, Sky Art and Cartel (Doo Sung). The Bow Setup part will advice on the best spine and thus arrow to use based on your selection of arrow shafts and bow setup.