Backtrack Stack

Backtrack Stack is a configurable N‑Back training app designed to help you practice working memory with multiple cue types. Cues (can be configured): - Position (3×3 grid) - Audio letters (spoken) - Color cue - Haptics on supported devices Training modes: - Adaptive difficulty (d′/accuracy-based) - Fixed N sessions - Preset runs (one-tap fixed sessions) - Optional per‑cue N (advanced) Stats: - Track hits, misses, false alarms, correct rejections, and d′ (d-prime) per cue and overall. Backtrack Stack works great on iPad and iPhone, is highly configurable, and keeps controls simple so you can focus on the task.