Price Line Alert is an indicator for MT4 and MT5 by EarnForex.com. It doesn't use any standard indicators. Its main purpose is to offer a simple yet powerful tool to place horizontal lines on the chart and to issue alerts when those lines get hit by the price.
It includes a graphical interface that can be dragged directly on the chart.
It supports notifications via email, mobile, and the platform's popup window.
A detailed description of the indicator can be found here: https://www.earnforex.com/metatrader-indicators/price-line-alert/
Any contributions to the code are welcome!