The developers — students at the University of Reykjavik — created the Android app for a contest, NBC News reports.
Genealogy is very popular in Iceland. The app uses the Islendingabok database — a national registry of family trees in Iceland — to alert people if they’re considering going out with someone who shares a grandparent. All the users need to do is tap phones and, if there’s too close a relation, the app alerts them.
Iceland is a small country with strong family ties. “On average if you pick two people on the street at random you will find they are related 6 or 7 generations back,” Friorik Skulason, the original developer of the database, told NBC News.