This is a simple and effective app for calculation of European-style option!
Based on B-S Model, support to calculate option price, implied volatility, put-call parity.
When you calculate option price/implied volatility, the greeks are calculated and show simultaneously.
For example, to calculate option price:
input underlying price, strike price, days to expire, riskless rate, implied volatility,
tap the blue button in the bottom,
the option price will be calculated and show immediately!
The other calculation types are also similar!