Sifr Calculator

Sifr is a modern Android calculator built with care — Material 3 design, fast, and respectful of your privacy (no ads, no tracking, no data collection).

✨ FEATURES

📐 Scientific mode
Trigonometric functions (sin, cos, tan and their inverses), logarithms (log, ln), exponentials, π, e, factorial, and square root. Switch between degrees and radians.

🧮 Memory keys
Standard memory operations — MC (Memory Clear), M+ (Memory Add), M− (Memory Subtract), MR (Memory Recall). Memory indicator in the display shows when memory is in use.

📱 Adaptive landscape
Rotate to landscape for a side-by-side layout: scientific block on one side, basic keypad on the other. Mirrors correctly under Arabic RTL.

✏️ Editable cursor
Tap anywhere in the expression to position the cursor and edit in place — like a normal text field, with no virtual keyboard.

🔄 Live result preview
See partial results as you type, before pressing equals.

📜 History
Browse past calculations. Tap any entry to restore the expression. Clear all with one tap.

🎨 Themes
Follow your system theme, or force Light or Dark. Material 3 dynamic colors on Android 12+.

🔇 Haptics & sound
Optional haptic feedback on errors and meaningful events. Optional error sounds. Both off by default — calculator-quiet by design.

🌍 Arabic support
Full Arabic localization with RTL-correct layout. Keypad stays LTR for clarity; UI strings flip naturally.

💎 Polished UX
Auto-shrinking display fits long expressions without truncation. IEEE-754 precision cleanup (sin(30°) = 0.5, not 0.4999…). Smart delete that peels function calls as single tokens.

🆓 Free & open
Sifr is free, ad-free, and tracking-free.

The name "Sifr" (صفر) is Arabic for zero — a nod to the language that gave us the modern numeral system and the concept of zero itself.