SKETCHOMETRY AND JSXGRAPH - DYNAMIC GEOMETRY FOR MOBILE DEVICES. Tablet computers seem to be a possible solution to many long-standing problems for technology based mathematics education. But a traditional user interface may not be the best way to interact with dynamic geometry software on a touch device. The new software sketchometry enables students to create mathematical constructions by drawing sketches with fingers or pens. This direct approach to Geometry invites students to experiment and thus stimulates active discovery learning. sketchometry is based on the software library JSXGraph and the programming language JessieCode , developed by the authors. JSXGraph and JessieCode offer a broad range of possibilities for mathematical visualization. For the ambitious user there is an innovative programming environment SketchBin to fine-tune constructions.