Not just flashcards.
Cognitive Physics.
We don't use simple timers. We model your brain using Bayesian Knowledge Tracing to track mastery probability, and Exponential Decay dynamics to schedule reviews at the exact moment of "Desirable Difficulty".
Optimized for Retention
Our FSRS algorithm ensures you reach 90% retention with the minimum number of reviews.
Dynamic Physics
Different concepts fade differently. We treat 'Math Formula' differently from 'Historical Date'.
Everything you need to study smarter
Explorer's Lab combines powerful study tools with a beautiful, intuitive interface designed for focus.
Spaced Repetition
Our algorithm learns your memory patterns to schedule reviews just before you forget.
Detailed Analytics
Track your progress with beautiful charts and heatmaps. See exactly how you're performing.
Cloud Sync
Your decks are always in sync across all your devices. Learn anywhere, anytime.
Smart Reviews
Focus on what you don't know. We handle the scheduling so you can handle the learning.
Fast & Fluid
Built with modern tech for a snappy, responsive experience that feels like a native app.
Progress Tracking
Visual feedback loops keep you motivated to maintain your daily study streak.