I used a third-party tool to analyze my and a relative’s results. They are different from my Family Finder results. Why is this?

When you compare two people’s Family Finder results using third-party tools, it is common for there to be small differences. The FamilyTreeDNA Family Finder program uses a proprietary set of calculations to evaluate shared DNA segments and to determine relationships. The bioinformatics team set thresholds not only to provide the most meaningful matches but also to account for microarray chip technology using current scientific knowledge.