Knots 3D is the ultimate knot-tying app for fishermen, climbers, boaters and scouters alike. With over 190 unique knots and new ones added frequently, Knots 3D makes it easy to learn even the most difficult knots in no time.
I've used this app for years. It's pretty great. You can slow the animation and move forward and reverse through tricky parts of the knots. I have the Arbor Knot, the Orvis Knot favorited for fishing. I also use the Adjustable Grip Hitch for adult type stuff, it's magic.