A good risk management and money management respectively is the basic tenet of trading stocks successfully. Even if the odds are stacked in your favor, it is inadvisable to risk a large portion of your capital on a single trade.
This app helps you to open the right position size per trade. It uses the one-percent-rule but you can adjust your risk percentage individually. (Generally between 1% and 2%)
All you have to do is entering your capital at risk, start price, stopp loss price and target price. With this data the app calculates the recommended position size for your stock trade.
Please note: this apps is not able to generate stock purchase recommendations. You should only buy it if you are already using the one-percent-rule (aka 2 percent rule).