Shooting the right kind of arrow is pretty important if you wanna shoot a high score, shooting arrows with a to high or to low spin can give you some disadventages when you score.
With the Arrows app you are ably to calculate the best spine for your drawlength and weight of your bow.
This app measures and shows you the results for both recurve and compound bows. You can find specifications and details from many different types and models of arrows.
Overal it’s the best way of finding out which arrow type and spine is perfect for you!