CalcBook is a smart notepad that understands math the way you think. Just type naturally and see results instantly — no buttons no formulas no effort.

How it works
Type anything like a note:
• "40 hours at $35/hour" ? $1400
• "flight $340 + hotel $120 × 3 nights" ? $700
• "100 km in miles" ? 62.14 miles
• "Jan 1 + 133 days" ? May 13 2025
• "split $120 3 ways" ? $40

CalcBook figures out the math automatically — even when mixed with regular words.

Perfect for
? Freelancers calculating invoices
? Travelers converting currencies and units
? Students solving everyday math problems
? Anyone who thinks in words not formulas

Key Features
? Natural language calculator — type like you talk
? Notepad-style editor — every line is a calculation
? Unit & currency conversion — fully offline
? Date & time math — days until days since durations
? Currency math — $ € £ ? and more
? Syntax color themes — easy on the eyes
? Multiple editor fonts
? 100% offline — no internet required ever
? No data collection no tracking
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CalcBook — the calculator that thinks like a notepad.