kei-san

kei-san is a multifunctional calculator app that combines everyday calculations and study tools in one. You can quickly switch between a scientific calculator, graph display, unit circle, trigonometric table, base conversion, and LaTeX preview. Main Features Scientific Calculator Supports arithmetic, powers, square roots, trigonometric functions, inverse trigonometric functions, logarithms, calculus, statistical functions, etc. Memory functions (MR / MC / M+ / M-) Input assistance (cursor movement, DEL, BS, CLR) Graph Display Plot input expressions and compare multiple formulas Legend display, toggle ON/OFF, scale settings, support for log-log graphs Learning Support Check the unit circle and trigonometric table simultaneously Convert expressions to LaTeX and preview formulas Base Conversion Convert between binary, octal, decimal, and hexadecimal Use Cases Calculations and verification for school or qualification exams Technical calculations and numerical checks at work Verification and visualization of formulas in research and development Features Intuitive layout for easy use Quickly switch between necessary functions on a single screen Smooth operation on mobile devices Notes Calculation results may vary depending on input conditions and rounding. Display may differ slightly depending on device or OS version. Support Terms of service, privacy policy, and contact information can be found in the in-app menu.