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CalcPro
Calculator app with everything I needed — Scientific, Unit Conversion, BMI, Split Bill, Currency, Loan calculator.
Technology Stack
FlutterProviderfl_chartmath_expressionsGoogle Fonts
Calculator
Standard Calculator
Basic arithmetic (+, -, ×, ÷) with Samsung-style display and live result preview
Scientific Calculator
sin, cos, tan, asin, acos, atan, log, ln, √, π, e, x², xⁿ, factorial with DEG/RAD toggle
Fraction Mode
Display results as mixed fractions (a/b) using fraction package
Smart Input
Auto-inserts parentheses, implicit multiplication (2( becomes 2×(), 500-char limit
Calculator History
Stores last 50 calculations, persisted locally
Post-evaluate Continuation
Press number after = to start new; press operator to continue from result
Unit Conversion
7 Categories
Length, Weight, Temperature, Area, Volume, Speed, Digital Storage
26+ Units
km, m, cm, mm, mi, yd, ft, in, ton, kg, g, mg, lb, oz, °C, °F, K, L, mL, gal, cup, km/h, m/s, mph, TB, GB, MB, KB, B, bit
Temperature Formulas
Proper Celsius/Fahrenheit/Kelvin conversions (not linear)
Swap Units
Quick button to swap from/to units
Health & Finance Tools
BMI Calculator
weight(kg) / height(m)² with color-coded categories and ideal weight range
Discount Calculator
Single and stacked discounts (20%+10%), optional PPN 11% toggle
Split Bill
Divide total bill among people with tip calculator (0-20%)
Currency Exchange
20 currencies with live rates from exchangerate-api.com, 24-hour cache
Loan Calculator
Monthly instalment with DP, interest rate, tenor; pie chart visualization
Advanced Features
Programmer Mode
HEX/DEC/OCT/BIN conversions with bitwise operations (AND, OR, XOR, SHL, SHR)
Function Graphing
Plot y = f(x) equations with parser caching for performance
Matrix Operations
2x2 and 3x3 support with +,-,×, determinant, and inverse
PDF Export
Generate loan reports and calculation history as PDF documents
Share Results
Share calculation results via native share sheet
UI/UX Features
6 Theme Presets
Deep Space, Cyberpunk Neon, Rose Gold, Mint Fresh, Sunset Blaze, Arctic Blue
Material You
Android 12+ dynamic color extraction support
Left-handed Mode
Reverses calculator button layout for accessibility
Haptic Feedback
Light impact on all button presses
Glassmorphism UI
Custom GlassContainer widget with optional blur effect
Onboarding
3-page intro with PageView and animated dots