A clean calculator + unit converter. No ads, no subscription, all features from day one. Calu+ Pro is a one-time purchase. Everything is unlocked the moment you download it. CALCULATOR · Edit your formula as you type — fix mistakes without starting over · One-tap tax calculation (add tax or remove tax) · Unlimited calculation history · Verification mode: enter the same calculation twice to catch errors UNIT CONVERTER · Length, weight, temperature, area, volume, and speed · All units update instantly as you type CUSTOMIZATION · Choose from 6 icon colors for your home screen · Dark mode, light mode, and system setting supported Just a calculator that gets out of your way.