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The default output is a Scalable Vector Graphics (SVG) file that can be viewed in a browser. Network Chart uses the python networkx module to assist in selecting what to display and Graphviz via the pygraphviz module to generate the chart.
{{man warn|Long chart creation times|Generating a chart of every individual in a very large database can lead to long chart generation times (See [[NetworkChart#Performance|Performance]]). Of course, subsets can be selected greatly reducing the chart generation times (See [[NetworkChart#Trim|Trim]] and [[NetworkChart#Highlight|Highlight]]).}}
{{man note|Slight Variations in Graph Layouts|Generated Network Chart graphs may change slightly after Gramps restarts. This is due to the [https://en.wikipedia.org/wiki/Nondeterministic_algorithm nondeterministic] nature of the Graphviz memory allocation method used in the dot layout engine.}}