HeyeLighter is an on-screen marker and annotation software that facilitates the analysis and completion of spreadsheets, charts and tables, as well as the reading of texts directly on the computer screen. HeyeLighter uses horizontal and vertical dynamic markers that make analyzing and filling out spreadsheets both more professional and enjoyable. Each marker has an aureodisc on one of its terminal regions. The aureodisc serves both as a handle and as a control panel for the marker. Each dynamic marker (vertical and/or horizontal) has 3 buttons on the aureodisc interface. Those buttons activate distinct marking styles or modes: simple line mode, heyelight mode and spaced line mode. The markers are available in six colors: red, blue, green, yellow, light blue and orange. The user can choose many vertical and horizontal markers in different colors at the same time. HeyeLighter has a reading line resource that can be activated to follow the mouse path and serve as a guidance for entering or reading data on a spreadsheet. The length of the reading line can be increased or decreased appropriately. You can change the color of the reading line and choose from six basic colors. HeyeLighter has a marker pen tool that can draw and write on-screen in real time. HeyeLighter is a friendly application that can be used by people of all age groups and professions. Nevertheless, it represents a very helpful tool mainly for people that work in accounting, business management, entrepreneurship education and scientific training. HeyeLighter can also be easily used in web conferences and webinars with desktop sharing.