App locks up after favoriting knots – What Knot To Do Review

I have an iPhone 5c an the app locks up every time I favorite a knot. I will be deleting the app because after reading other reviews there are claims of knots being inaccurate, which could be deadly for a person in a climbing situation. This is a shame cause I enjoy the quality an comfort of Columbia clothes when I'm out on the water. Maybe that's what they should stick with.
Review by Flafishman on What Knot To Do.