DigitDo has all sorts of checks, messages, safeguards, tooltips, and guides buil. A multi-app software program. If you just want something simple to do the basics, yet also sometimes want more.
Have it both ways! Included is a view setting of simple or not-so-simple. You choose the mode with a single click.

DigitDo Features:
1. Δ - calculator
2. Σ - sum / adder
3. ƒn - financial calculator
4. u» - unit conversion
5. dt - date time calculations
6. % - percent functions
7. §FX - special functions

DigitDo Support Functions:
* abs( num | expr )
* Acos( num | expr )
* Acosh( num | expr > 1 )
* Asin( num | expr )
* Asinh( num | expr )
* Atan( num | expr ) )
* Atanh( num or expr )
* cos( num | expr )
* cosh( num | expr )
* exp( num | expr )
* gcd( int1 , int2)
* lcm( int1 , int2 )
* ln( num | expr )
* log( num | expr )
* logN( number , base N)
* MarkDown( num | expr , percent )
* MarkUp( num | expr , percent )
* mod( dividend , divisor )
* power( base , exponent )
* round( num | expr , int )
* sin( num | expr )
* sinh( num | expr )
* sqrt( num | expr )
* tan( num | expr )
* tanh( num | expr)

Requirements:
* NET Framework

The license of this software is Free Trial Software, the price is $14.95, you can free download and get a free trial.