[Android, iOS] Free: Knots 3D (Was $9.49) @ Google Play/Apple Store

Knots 3D is free for a limited time. Popular game.

iOS(apps.apple.com) Expired - Android(play.google.com)

Used by arborists, fishermen, firefighters, climbers, military and boy and girl scouts the world over, Knots 3D will quickly teach you how to tie even the most difficult knot!

Accolades
•  Google Play Editors' Choice designation
•  Winner of Google Play Best of 2017, Hidden Gem category.
•  Included in Scouting Magazine's "Best Scouting Apps of 2016"

With more than 150 knots, Knots 3D will be your go-to reference! Grab some rope and have fun!

Product Features and Functions:
•  152 unique knots with new ones added frequently.
•  Browse by category or search by name, common synonym or ABOK #.
•  Landscape and portrait modes and full screen (zoom in to see greater detail).
•  Watch knots tie themselves and pause or adjust the speed of the animation at any time .
•  Rotate knots in 360 degree, 3D views to study them from any angle.
•  Interact with the knot on screen by "scrubbing" your finger over the knot to advance or rewind the animation.
•  Dark mode / Light Mode
•  No advertisements. No in-app purchases. No subscriptions. Ever!

via Lysander at OzBargain(ozbargain.com.au)