The following apps have been developed by HeffDev.


iSOS is the ideal app for people who have wished they could quickly and easily notify someone and give them their location when they are in trouble.


RAC relieves the Rally Navigator of this tedious task and allows him to focus on what is important to win the race!

Rally Average Calculator - RAC Pro

The most advance rally calculator we’ve put on the market

Monschau App

Beautful Monschau, located in the hills of the North Eifel, within the Hohes Venn – Eifel Nature Park in the narrow valley of the Rur river.