Limited slots today
Download Gems Deck
Master Gems Deck Algorithms Faster
Offline algorithm trainer built exclusively for competitive speed cubers who refuse to waste time
★★★★★
4.8 Rating
50K+ Active Users
2.1 MB Size
Offline algorithm trainer built exclusively for competitive speed cubers who refuse to waste time
Choose your starter bonus – all codes activate instantly upon first launch
All algorithm packs remain accessible offline forever. No subscription required. Codes valid through 01.09.2026.
Performance features that actually cut solve times
Instant sequence checker flags incorrect moves before you memorize mistakes. Built-in parser catches notation errors in milliseconds.
Algorithm practice system learns your weak cases and serves targeted drills. Tracks recognition speed and execution accuracy per algorithm.
Organize algorithms into competition decks, training sets, or method variations. Tag, filter, and search across your entire library instantly.
Zero internet required after install. Practice on flights, compete in basements, train anywhere without connectivity anxiety.
Visual heatmaps show which algorithm families need work. Export stats to CSV for external analysis and competition prep tracking.
Supports WCA standard, SiGN, and custom notation systems. Switch between display modes without re-entering algorithms.
Architecture designed for speed cubers by speed cubers
Gems Deck stores every algorithm as a validated sequence object in local SQLite, enabling sub-10ms search across thousands of entries. The drill engine uses spaced repetition intervals calibrated specifically for motor skill retention, not generic flashcard timing.
Recognition training mode displays scrambled cube states and measures the delay before you identify the correct algorithm. Response times are logged per case family, revealing exactly which recognition patterns need deliberate practice before your next competition.
The validation parser runs a full legality check on every move sequence you enter, catching impossible turns, redundant rotations, and common notation typos. This prevents ingraining incorrect fingertrick patterns that would sabotage muscle memory during timed solves.
Battle-tested practice patterns from sub-15 solvers
Gems Deck is maintained by competitive cubers frustrated with algorithm apps that prioritized aesthetics over training efficiency. The core team includes three sub-10 solvers who built the drill engine around their own competition prep workflows.
Development follows a strict offline-first philosophy: every feature must function without network access, and all algorithm data resides in encrypted local storage. Privacy is guaranteed because your training data never leaves your device unless you explicitly export it.