Unlimited Calculator Pro vs Constructive Calculator

Unlimited Calculator is the most powerful calculator available on the App Store. Unlike standard calculators limited to 15–16 digits, Unlimited Calculator handles numbers of any size — millions of digits — with perfect precision. Whether you are a student, engineer, researcher, or simply curious about mathematics, Unlimited Calculator gives you tools that go far beyond arithmetic. What makes it unique: Arbitrary-precision arithmetic using BigInteger — no rounding, no overflow, no limits RSA key generation (256 to 2048 bit) with step-by-step explanation Diffie-Hellman key exchange demonstration Collatz conjecture explorer with animated sequences Prime factorization, Euler totient, Miller-Rabin primality test Special sequences: Fibonacci, Catalan, Bell numbers, and factorial with exact BigInteger results Matrix calculator for linear algebra operations Unit and currency converter Function grapher with zoom and pan Finance calculator (compound interest, loan amortization) Scan handwritten or printed expressions using the camera (OCR) Multi-base display: see your result simultaneously in decimal, hexadecimal, binary, and octal Calculation history with tags, star, and CSV/JSON export Home screen widget showing your last calculation Full VoiceOver accessibility support Dark mode, light mode, and custom accent color Complete Italian localization

Ordinary calculators round. Constructive Calculator doesn't. It computes with constructive real numbers, an arbitrary-precision engine that keeps every result exact and hands you as many correct digits as you ask for. The rounding errors that quietly accumulate in ordinary calculators simply never happen. AS MANY DIGITS AS YOU WANT A pocket calculator stops at about 15 digits and rounds off the rest. Constructive Calculator keeps every result exact, so the digits a normal calculator throws away are still there. Swipe √2, π, or any answer to pull in tens, hundreds, or thousands more, computed on demand. SCIENTIFIC KEYPAD Trigonometry in degrees or radians and their inverses, exponentials and logarithms, powers and roots, factorials, percentages, the constants π and e, and the standard normal distribution, its CDF Φ and quantile Φ⁻¹, computed to the same arbitrary precision as everything else. BIG INTEGERS, IN FULL 52! (the number of ways to shuffle a deck) prints in full, all 68 of its digits, with no scientific-notation hand-waving. BUILT FOR CLARITY A running tape of recent calculations, locale-aware digit grouping, and copy at whatever precision you need. Constructive Calculator is an independent port of Hans Boehm's constructive-reals calculator, rebuilt natively for iPhone and iPad.