eSpyFlagship product
Question Configurator
Create targeted math practice by course, topic, difficulty, question family, format, and solution settings.
Middle School · High School · University · Through Calculus
eSpyMath · Math Research Company
Better math practice, built through research.
eSpyMath develops research-driven tools that help students practice mathematics more clearly and purposefully—from middle school through university-level Calculus.
Student helper · v50
Mental Math
Focused practice for number sense, fluency, accuracy, and confidence across 9 levels and 44,020 embedded question records.
Student helper · Level 14
Cross Math Puzzle
Interactive arithmetic puzzles with dedicated desktop and mobile modes, instant validation, deterministic seeds, and printable worksheets.