Gems Deck

Gems Deck is a private, offline workspace for learning Rubik's Cube algorithms.

Build your own deck or start with included OLL and PLL cards. Search and filter your collection, mark difficult cases, and keep recognition or execution notes beside every algorithm.

The notation parser checks common face, wide, slice and rotation moves. Repeated groups can be expanded automatically, and the trainer walks through every normalized move with adjustable paced playback and a clear 2D layer map.

Use the attempt timer to track practice count and personal best times. Unsaved editor changes are restored locally, so interrupted sessions are not lost.

Your data stays on your device. Gems Deck has no account, no subscription, no ads, no required connection and no Internet permission. Export a versioned JSON backup whenever you need to move or restore your collection.

Key features:

• OLL, PLL and custom algorithm collections

• Search, filters, sorting and difficult markers

• Notation validation and repeated-group expansion

• Step-by-step and automatic move playback

• 2D face and layer highlighting

• Attempt timer, practice count and best time

• Local draft recovery

• JSON backup import, merge and replace

• Light, dark and system themes

• Fully offline operation