The complexity of the Ethereum smart contracts makes it challenging to avoid security flaws. This problem led to many code analysis tools, which detect potential flaws and report them textually. However, the lack of context and visual information in these reports hinders the stakeholders’ understanding of the detailed information. Visualization can assist a developer in grasping such context, but current state-of-the-art visualization tools provide only fixed and limited visualization types. To this end, we present ContractViz, based on the versatile platform Eclipse Trace Compass (TC), which supports multiple views and analyses in parallel. Our contribution enables TC to visualize Ethereum transaction traces using flame charts and gas consumption plots. This reveals information on account activities and provides insights into the correct or possibly flawed behaviors.