Unlimited Calculator Pro

Version 2.0 is a complete overhaul of Unlimited Calculator. Every part of the app has been rebuilt from the ground up. Critical bug fixes The BigInteger engine that powers every calculation in the app received several critical repairs. A long-standing bug caused the square function to compute a square root instead of a square, producing wrong results in RSA key generation and the math challenge mode. The comparison operators (less than, greater than) were reversed, silently flipping the result of every inequality. A memory leak in the Miller-Rabin primality test has been eliminated. Serialization of large numbers to disk was reading the wrong byte length, which could corrupt saved history entries. All of these issues are now resolved. New features The Explore tab introduces a mathematical fact of the day and a deterministic number of the day, refreshed every 24 hours. The expression undo and redo system uses a ring buffer that stores up to 50 states; shake the device to undo. The adaptive keyboard now shows only the symbols that are valid for the currently selected numeral base, reducing input errors. Results are displayed simultaneously in decimal, hexadecimal, binary, and octal in a dedicated panel. A matrix calculator handles operations on integer and real matrices. A finance calculator covers compound interest and loan amortization. The unit and currency converter supports dozens of categories. The function grapher supports pinch-to-zoom and drag-to-pan. A camera OCR scanner reads handwritten or printed mathematical expressions directly from the viewfinder. A home screen widget shows the last calculation and the first result of the day. The onboarding flow introduces new users to 50-digit arithmetic, the Collatz sequence, and the differences between the free and Pro tiers through three interactive screens. A math challenge mode presents increasingly difficult problems, tracks your streak and personal record, and lets you share your result. The rewarded ad system offers five unlock gates with flexible durations (hours, days, or single use). Pro users bypass all gates permanently. Themes and accessibility Three color schemes are available: system, light, and dark. The accent color can be customized. Every interactive element carries an accessibility label and hint, and important calculation events post VoiceOver announcements. Localization The app is fully localized in Italian, with more than 200 localization keys covering every screen, button, and error message.