The Happiness Indicator ( is a website containing self-help tools designed to make people more aware of their own happiness. The theory behind the tools is that a keener awareness of one’s own happiness helps users find an optimal lifestyle and consequently promotes happiness among its users. Users of the website periodically record how happy they feel on the present day and how happy they have felt over the past month, using the Happiness Comparer. They also have the option of indicating in the Happiness Diary how happy they felt during the various activities of the previous day. Users receive instant feedback in the form of comparisons with their earlier scores and with the average scores of similar participants. In this chapter we assess the effect of using this tool on happiness considering the change in happiness among 5411 users who have participated at least twice. We found that using the Happiness Diary 10 times, results in an average increase in happiness of 2%. Repeated use of the Happiness Diary had a particularly strong effect for those who initially felt the least happy. Use of the Happiness Indicator may have prevented a decline in happiness among our participants, such as observed in the control-groups of 10 studies among self-selected participants in happiness trainings. If so, the net effect of using the Happiness Indicator was about 5%, which is quite substantial and comparable to the short-term effects of real-life events, such as the birth of a first child.,
Department of Sociology

Veenhoven, R., Bakker, A., Burger, M., van Haren, P., & Oerlemans, W. (2019). Effect on happiness of happiness self-monitoring and comparison with others: Using the Happiness Indicator. In Evidence-Based Positive Psychological Interventions in Multi-Cultural Contexts. doi:10.1007/978-3-030-20311-5_1