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📱 Hyojason Calculator — A large-print calculator for comfortable use, even for those with presbyopia

Do you have trouble seeing small print because your vision is blurry?

Do you want to calculate without a magnifying glass?

The Hyojason Calculator features large buttons, large numbers, and displays results in a large format.

Just like a back scratcher, it solves the inconvenience of out-of-reach areas.

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✅ Key Features

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🔢 Basic Calculations

• Basic arithmetic operations including addition, subtraction, multiplication, and division

• Supports decimal points, sign conversion, and continuous calculations

• Displays commas for thousands separators (e.g., 1,234,567)

💰 Value Added Tax (VAT) Calculation

• Calculate price including VAT with a single press of the VAT+ button (×1.1)

• Calculate price excluding VAT with the VAT− button (÷1.1)

• Practical for markets, shops, and self-employed individuals

📋 Calculation History

• Automatically saves the last 10 calculations

• Tap to copy the result immediately

🔠 Font Size Adjustment

• Small / Medium / Large / Very Large — 4 levels of adjustment

• Customizable to suit your level of presbyopia

🌓 Light / Dark Theme

• Bright outdoor environments → Light Theme

• Dark indoor environments → Dark Theme

📳 Vibration · Sound Feedback

• Vibration confirmation when pressing a button

• Click sound can be toggled ON/OFF

📋 Copy Result

• Long press result numbers to copy to clipboard

🔆 Always On

• Can be set to prevent screen from turning off during calculations

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♿ Accessibility

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• Voice guidance (TalkBack) supported on all buttons

• High contrast colors (meets WCAG AA standards)

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❌ What is NOT

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• No ads

• No internet connection required

• Collection of personal information None

• No unnecessary permission requests

Gift this to your elderly family members 🎁
You can use it immediately after installing it on your parents' smartphone.