Proofstep: Learn & Calculate

Proofstep is a complete, self-paced math route that teaches the reasoning behind each operation, then helps you practice it, solve your own problems step by step, and see exactly where you stand. Start with addition and progress through subtraction, multiplication, division, fractions, decimals, percentages, integers, ratios, powers, roots, geometry, algebra, equations, and functions. Each stage builds directly on the one before it. NEW IN 2.0: STEP-BY-STEP SOLVER Type your own problem and Proofstep solves it exactly, explains every step, and checks the answer: - Linear equations with parentheses, fractions, and decimals, such as 2(x - 3) = 14 - Fraction and mixed-number arithmetic with common denominators and simplifying - Quadratic equations with exact roots in simplest radical form, complex roots, and the vertex - Percent of a number, "what percent", and percent change - Proportions with the unknown in any position Recent problems are saved on your device so you can revisit the steps. LEARN ONE CLEAR STEP AT A TIME - Follow 12 connected stages and 36 focused lessons. - See every idea explained with a visual model and worked steps. - Watch 12 short narrated micro-lessons, available completely offline. - Complete a quick understanding check after every lesson. - Pass each five-question checkpoint to reveal the next stage. PRACTICE THAT NEVER RUNS OUT - Fresh problems for every unlocked stage, generated on your device, with answers checked by the calculator engine. - Wrong answers are built from common mistakes, and every answer comes with an explanation. - Mixed practice across all unlocked stages. - Review mistakes: every question you miss in a lesson, checkpoint, or practice returns for spaced review until you get it right on two separate days. SEE YOUR PROGRESS - 14-day activity chart, study streak, accuracy, and best streak. - Accuracy and checkpoint best for each stage, plus a suggested focus stage with one-tap practice. - Share a PDF or CSV progress report with a parent or teacher. - Export a backup and restore it on another device. A CALCULATOR THAT GROWS WITH YOU Proofstep begins with the tools you are learning now. New operations appear as you master the related stage. Complete the route to unlock the full scientific calculator, including powers, roots, trigonometry, logarithms, constants, memory, and degree or radian modes. Calculation history is kept between launches. DESIGNED FOR FOCUSED LEARNING - No account or sign-in. - No advertisements or tracking. - No subscriptions or in-app purchases. - No internet connection required. - Progress remains on your device. - Built for iPhone and iPad with Dynamic Type, Dark Mode, and VoiceOver support. Proofstep is a one-time paid download. Learn the why, practice the method, and earn every tool you unlock.