Calc89 is a full computer-algebra graphing calculator built around the classic 89-style keyboard. Every key, shift label and menu sits where you expect it, so the keystrokes you already know just work, now on a crisp, modern display for iPhone and iPad that follows Light and Dark Mode. EXACT ANSWERS • Fractions, radicals and π stay exact: √12 = 2√3, sin(π/12) = (√6−√2)/4 • Complex numbers in rectangular or polar form • Huge integers, exact factorials and prime factoring • Units and conversions