Hazardous chemical substances are used virtually every day. When these are stored or transported, extraordinary events occur from time to time, and as a consequence, health or lives of people within the reach of the accident or in the surroundings through which a hazardous cloud of this substance may spread are in danger. For a more efficient and easier operation of the emergency services and of the workers in crisis management, software products are used that model and simulate leakages of these substances and this way, they provide valuable information. This article compares the selected software and evaluates its efficiency.