Mobile apps in mental health have seen a significant growth in recent years. Most of them are aimed at treating depression, anxiety, and stress disorders using cognitive behavioural therapy methods and relatively few apps are being developed to address interpersonal issues. This study tested the effectiveness of the iCognito Relationship Program, a self‐help application for couple relationships based on the chatbot technology. A between‐group experimental study was conducted in Russia using the bibliotherapy as a control condition (N = 58, female sample), with results showing that, after 2 weeks, iCognito's users had increased satisfaction, tenderness, constructive communication, as well as commitment to the relationship. Also, indicators for relationship self‐efficacy, communicative skills in relationships, and self‐esteem regarding relationship skills had significantly increased, while level of conflicts had decreased. A medium effect size was reported for most indicators. The participants of an experimental group expressed a high level of satisfaction with the technology and a generally positive attitude towards the idea of working with a “virtual psychologist”‐chatbot on their personal issues. Despite the need to reproduce the research results, iCognito program demonstrates that both mobile application and chatbot technologies can be useful for training individuals’ relationship satisfaction and communication skills, and that they can be more efficient in increasing satisfaction and reducing conflict in relationships than self‐help books.