The purpose of research is to develop a software and information system for conducting psychological testing of the emotional sphere of a person, with the possibility of determining the diagnosis for subsequent consultation with a psychologist.Methods. To implement the software system, the C# programming language was used using libraries: Net Framework 4.7.2, ASP.NET Core. To form the tests, the methods of "Determination of emotionality" by V. V. Suvorova, express diagnostics of the tendency to affective behavior by V. V. Boyko, express diagnostics of the tendency to hyperthymia by V. V. Boyko, express diagnostics of the personal tendency to low mood (dysthymia) by V. V. Boyko, "Tendency to euphoria" by V. V. Boyko, "Determination of the state of frustration" V. V. Boyko. The input data of the program are the user's responses, and the diagnosis calculated based on the test results obtained. The MSSQL Server 2014 DBMS was used for data storage.Results. As a result of the development of the software product, the interface and architecture of the program were developed. Implemented functionality for testing according to the above methods. An algorithm has been developed designed to diagnose the psychoemotional state of the individual, in accordance with the test results obtained. In the course of the conducted studies, it was shown that the accuracy of the methods is 95%. A database has been developed to store information about users, their roles, as well as information about questions included in tests for their interaction. The test results showed that the software system fully meets the functional requirements and is ready for use.Conclusion. The developed web-service allows psychological testing of the emotional sphere of a person according to certain methods, with the possibility of determining the diagnosis for further interaction with a psychologist. The prospect of further development is to expand the functionality of the created software and information system by adding new methods of express diagnostics of psychological or emotional states of a person.