CustomKeys Programmable Calc

☕ One-time purchase at the price of a coffee. No ads, no subscription, no in-app purchases. Pay once – the app is yours forever. No surprises, no purchase prompts. CustomKeys is a calculator you can tailor to your needs. Eight programmable keys keep your most-used values and functions always at hand – no more repetitive typing. 🔑 PROGRAMMABLE KEYS Long-press any key to configure it as: • Number – any value (e.g. VAT multiplier 1.19, material price, constant...) • Function – operation (+, −, ×, ÷), square root √x, square x², percentage % or constant π • MEM – memory key. Result saves automatically after =, tap to recall stored value. 📐 GEOMETRY FORMULAS A row of geometry shape icons sits below the display. Tap a shape, enter dimensions, send the result directly to the calculator. Available: • Circle – area, circumference • Triangle – area, perimeter, hypotenuse (Pythagoras) • Square – area, perimeter, diagonal • Rectangle – area, perimeter, diagonal • Rhombus, Parallelogram, Trapezoid – area, perimeter • Cylinder – volume, surface area, lateral area ⚙️ CUSTOMIZATION • Individual key colors – 9 color options per key • Drag & drop to rearrange base keys • Dark mode • Display number size (large / medium / small) • Left-handed mode – mirrored keyboard layout • Sound and haptic feedback • Slovak / English CustomKeys is perfect for tradespeople, builders, merchants and anyone who uses a calculator daily. One purchase, no ads, no surprises.