Calclin
RollCalc
Free
Up to 3 calculators side by side. Add notes to your history, copy results with a swipe. Powered by a high-speed C/C++ engine for serious calculation.
A feature-rich calculator built for people who think while they calculate.
■ 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
Ratings & Reviews
This app has not received enough ratings or reviews to display an overview.
We have fixed several bugs.
The developer, Azukid.com, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Masakazu Matsuyama
- Size
- 7.2 MB
- Category
- Productivity
- Compatibility
Requires iOS 18.0 or later.
- iPhone
Requires iOS 18.0 or later. - iPad
Requires iPadOS 18.0 or later.
- Languages
- English and Japanese
- Age Rating
4+
- 4+
- Copyright
- © 2010 sumpo@azukid