ExSciCalc app for iPhone and iPad

"Extended" scientific calculator has more features than typical calculators, including:
• 30+ digits of precision, twice that of typical calculators.
• Extended memory including a main memory with statistical information, and 10 auxiliary memory values.
• Scroll windows allowing unlimited space for buttons--no confusing modes and function keys.
• Normal functions including:
◇ Normal and hyperbolic trigonometry
◇ Various logs, powers and roots
◇ Extensive unit conversion constants
◇ % calculations including interest and amortization
◇ Temperature conversion
◇ Random numbers
◇ Averages and means
• Plus functions not found on most calculators including (but not limited to):
◇ Statistical information for calculating standard deviation (tied to the M+ key)
◇ Roots of polynomials and some transcendental equations
◇ Special relativity calculations