Free
Kalkulilo (scientific calculator)
Kalkulilo is a comfortable calculator program and offers several different modes.  The scientific mode offers all the usual functions and operations like the basic arithmetical operations, power, logarithm, roots, trigonometry etc.  The bit/integer mode offers logical operations (AND, OR, XOR, >>, etc.) on bit level. All values can be displayed as binary, octal, decimal or hexadecimal numbers. Calculations can be done in 8, 16 32 or 64 bits.  In the statistics mode you can create a sample by adding several values and then calculate mean, median, quantil values, variance, standard deviation, range etc.  Trigonometry mode provides lots of trigonometric functions  The base/radix mode allows you to do calculations with numbers of base 2 to base 36  The Time mode lets you directly work with time values (hours, minutes seconds)  A simple calculator is also included, with just the basic operators and large buttons. Colorized keys will help to distinguish between the different categories of the functions and operations. The user interface (design, colors) can be customized. The App also includes a calculator widget for the notification center and a calculator App for the Apple Watch. Note: This app uses iAds to generate revenue to cover the costs for developement and support, and to be able to provide the App for free. But you can get rid of the iAds permanently for a small fee via InApp purchase.
Read more +Helps you:
Perfect for:
What you should know about Kalkulilo (scientific calculator) app

Highligths
Finally a full featured scientific calculator”

Keep in mind
Now the other problem is the color scheme”
Bloody greedy developers”
Really unacceptable to have flashing banner ads in a calculator app”
Author’s description
Discover more like Kalkulilo (scientific calculator)
 Similar apps
 Scientific calculator

Calculator +
Free 
The Calculator Free
Free 
Calculator for iPhone  Calc Pro Free
Free 
Calculatorâ
Free 
Calculator HD Pro Lite
Free 
PCalc
$9.99