991 Plus—Scientific Calculator Live

991 Plus is a free scientific calculator and graphing calculator for students, engineers, and professionals — built to work completely offline with a clean, distraction-free interface. Designed around the layout of the ES Plus scientific calculator series, 991 Plus handles everything from basic school math to advanced university-level calculations with precision and speed. ━━━━━━━━━━━━━━━━━━━ 🔢 991 PLUS SCIENTIFIC CALCULATOR ━━━━━━━━━━━━━━━━━━━ • Natural display — expressions shown exactly as in textbooks • Trigonometric functions: sin, cos, tan and all inverses • Logarithms (log, ln) and exponential functions • Powers, roots, fractions, and percentages • Complex number calculations (rectangular and polar form) • Combinations, permutations, GCD, LCM, prime factorization • High-precision results for engineering-level work ━━━━━━━━━━━━━━━━━━━ 📈 GRAPHING CALCULATOR ━━━━━━━━━━━━━━━━━━━ • Plot multiple functions simultaneously • Cartesian, polar, and parametric graph modes • Auto-detect roots, intersections, minimums, and maximums • Trace mode and tangent line visualization • Pinch-to-zoom for detailed graph analysis • Derivative graph overlay ━━━━━━━━━━━━━━━━━━━ 🧮 EQUATION SOLVER ━━━━━━━━━━━━━━━━━━━ • Linear, quadratic, and cubic equation solver • Systems of equations (2 and 3 unknowns) • Polynomial solver • CAS: symbolic calculation and algebraic simplification ━━━━━━━━━━━━━━━━━━━ 📐 CALCULUS ━━━━━━━━━━━━━━━━━━━ • Derivative and differentiation calculator • Definite and indefinite integral calculator • Limit calculations • Taylor series expansion ━━━━━━━━━━━━━━━━━━━ 📊 STATISTICS & DATA ━━━━━━━━━━━━━━━━━━━ • Single-variable and two-variable statistics • Regression models: linear, quadratic, exponential, logarithmic • Histograms, box plots, and scatter plots • Probability distributions: normal, binomial, Poisson ━━━━━━━━━━━━━━━━━━━ 🟦 MATRIX & VECTOR ━━━━━━━━━━━━━━━━━━━ • Matrices up to 10×10: inverse, determinant, transpose • Vector dot and cross product • Solve linear systems using matrix operations ━━━━━━━━━━━━━━━━━━━ 🎨 MODERN INTERFACE ━━━━━━━━━━━━━━━━━━━ • Dark theme for comfortable night and low-light use • Full-screen distraction-free layout • Smooth animations and responsive design for all screen sizes • Lightweight and fast — no lag, no unnecessary permissions ━━━━━━━━━━━━━━━━━━━ ⚡ FULLY OFFLINE ━━━━━━━━━━━━━━━━━━━ No internet connection required. 991 Plus runs completely offline — results are instant, anytime, anywhere. Perfect for: • Exam and classroom use • Engineering and lab work • Daily calculations on the go ━━━━━━━━━━━━━━━━━━━ ✅ WHY 991 PLUS? ━━━━━━━━━━━━━━━━━━━ ✔ Free — no subscription, no hidden fees ✔ Works 100% offline ✔ Natural display matches real ES Plus calculator layout ✔ Covers algebra, calculus, trigonometry, and statistics ✔ Built for high school, university, and professional use ✔ Lightweight and fast with a clean modern interface Download 991 Plus today — the free scientific calculator and graphing calculator that fits in your pocket.