Free Knots App Save $2 for Apple, Android and Amazon devices
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Amazon offers Knots 3D for Android for free. (Google Play charges the same, and iTunes has it for iPhone and iPad for the same.) That's $2 off and the best price we could find. It features instructions for over 120 different knots.
One of the best I've seen and it's free.
https://play.google.com/store/app...ix.knots3d
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