Calcatom

About

Calcatom transforms your browser into a powerful, privacy-first calculator. No tracking, no accounts, no analytics. Just pure calculation power.

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🧮 WHAT YOU GET

Scientific Calculator
• Trigonometry (sin, cos, tan, arcsin, arccos, arctan)
• Logarithms (ln, log₁₀, eˣ, 10ˣ)
• Powers and roots (x², x³, √, ∛, xʸ, ⁿ√x)
• Parentheses for complex expressions
• Constants (π, e)
• Factorial, reciprocal, percentage
• Angle mode toggle (DEG / RAD)
• 2nd function key for extended operations

💱 Live Currency Converter
• 150+ currencies including crypto (BTC)
• Real-time exchange rates
• Swap currencies instantly
• Favorite currencies pinned to top
• Search any currency by code or name
• Works with private API keys for higher limits

🧮 BMI Calculator
• Metric and imperial units
• Color-coded categories (Underweight, Normal, Overweight, Obese)
• Visual gauge display

💰 Tip Calculator
• Split bills by number of people
• Preset tips (15%, 18%, 20%) or custom
• Real-time per-person calculation

📈 Percentage Calculator
• Three modes: X% of Y, X is what % of Y, Increase/Decrease by X%

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✨ FEATURES YOU'LL LOVE

⌨️ Keyboard Shortcuts
Use your keyboard like a real calculator. Type numbers, operators, Enter for equals, Backspace to delete, Escape to clear.

🎨 Customizable Themes
Choose from 5 beautiful themes. Dark mode, Light mode, Aqua, Sunset, iOS Dark, iOS Light. Premium themes unlock with one-time purchase.

📊 Calculation History
Never lose track of your work. Full history with timestamps and date grouping. Free users save 20 entries, premium saves unlimited.

🔊 Sound & Haptic Feedback
Tactile clicks with every button press. Adjustable in settings. Pitch varies by key for satisfying feedback.

🎯 Precision You Can Trust
Powered by Decimal.js for exact floating-point math. No more 0.1 + 0.2 = 0.30000000000000004 errors.

🛡️ Privacy First
• No tracking scripts
• No analytics
• No account required
• All calculations stay in your browser

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💎 UPGRADE TO PRO

One-time payment of $4.99 unlocks:
• 3 premium themes (Sunset, iOS Dark, iOS Light)
• Unlimited calculation history

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🔧 SUPPORT

• GitHub Discussions for feature requests and community support
• Email support included

Install Calcatom once — calculate anywhere.

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Note: Currency Converter requires a free ExchangeRate-API key (1,500 requests/month). Add it in Settings → Currency API Key. No shared key = no tracking.