FormulaBase is a fast, offline-first formula reference built for students of probability, statistics, linear algebra, calculus, optimization and machine learning. Every card gives you more than just the formula: • The formula itself, in clean LaTeX • What each symbol means • The intuition behind it — not just the math • When to use it, and the conditions that must hold • A step-by-step derivation, when the formula benefits from one • A common mistake students make with it • Practice questions to check you actually remember it Ask a follow-up question about any formula, or request an AI-generated explanation when a topic isn't clicking. No account, no ads, no tracking. Your progress stays on your device. Subjects covered: Probability · Statistics · Linear Algebra · Calculus · Optimization · Machine Learning