This digital service tool brings in a web based environment the ALDREN project developed IEQ tool. ALDREN project developed an index that allows the rating of Indoor Enviromental Quality(IEQ) in buildings that are being designed or are in operation and undergo Deep Energy Renovation (DER) called ALDREN TAIL, in short TAIL. TAIL describes four components of IEQ, i.e.,

• thermal environment (T),
• acoustic environment (A),
• indoor air quality (I), and
• luminous (visual) environment (L),

as well as the overall quality of the indoor environment.