Calclin

This calculator app lets you perform calculations as if you were typing on a roll of paper.

■ Multiple Calculators Side by Side
Use up to 3 calculators at the same time. Tap [+] or [−] in the header to add or remove panels, swipe or tap the indicator to switch, and double-tap to toggle between 1-panel and 2-panel view.

■ History with Notes
Your calculation history holds up to 100 entries — and you can annotate each one.
· Swipe left: delete
· Swipe right: add a memo / copy expression / copy answer
· Double-tap: copy expression
Leave a quick note so you always know what each calculation was for.

■ High-Precision Calculation Engine
Built on a C/C++ fixed-point decimal engine capable of over 2 billion significant digits. Calclin uses 60 of those digits to deliver accurate, error-free results.

■ 7 Rounding Modes
Includes the internationally recognized round-half-to-even (banker's rounding) [JIS Z 8401 Rule A] as the default, plus round-up, truncate, and 4 more modes.

■ Percentage Calculation
Uses the same intuitive style as Google Calculator:
100 + 5% → 105 · 100 − 5% → 95 · 100 × 5% → 5 · 100 ÷ 5% → 2000

■ Unit-Aware Calculation
Attach units to your numbers and calculate with them.
· Length: mm · cm · m · km · in · ft · yd (and traditional Japanese units)
· Area: m²· a · ha · km²· ac (and more)
· Volume: ml · dl · L · m³ · gallon (and more)
· Weight: mg · g · kg · t · pound (and more)

■ Customizable Keyboard
Choose from 5 keyboard layouts and rearrange keys to your liking.

■ More Features
· √ (square root) · 3√ (cube root)
· Constants: π (pi), φ (golden ratio), e (Napier's constant)
· Percentage symbols: % ‰
· Choose decimal point, grouping symbol, and grouping style (including Indian numbering)
· Adjustable text size