ACALCU is the world's most customizable calculator for Windows. Right-click any button — change color, font, size, label. Set images as button backgrounds. Set videos (up to 59 seconds) as button backgrounds. No other calculator does this. Full scientific mode — sin, cos, tan, log, ln, √, π. Lighter than Windows Calculator. Full keyboard support. Calculation history. Single .exe. No installation. Just run. Built by Akhouri Anmol Kumar Founder, Akhouri Systems.