Excellent! Makes it easy to learn new knots!
Ability to visually follow clear, distraction-free, and sequenced photos of the knots being tied as well as synchronized textual descriptions is a real help. I like the fact you can replay the photo sequences at your own pace. This app also provides very useful background information each knot, including how/why it is used, advantages/disadvantages. Extensive list of knots that may be categorized by use, makes finding suitable knot a breeze. $5 may sound a little steep, but I think that this app is worth it. Ive got a few knot-tying instructional books on my shelves now that are simply gathering dust!
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Animated Knots by Grog