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Thirteen years after Peter Thaler brought Nudge Theory [1] into prominence, a concept which proposes that subtle changes in the way choices are presented can intuitively guide individuals towards desired behaviors. Since 2008 there has been substantial research into its application in research and practice. For instance, Maiden and his colleagues [2] were able to significantly encourage employees taking the stairs over the elevator by incorporating footprints and posters that reveal the “desired path”. Another example is provided by Lee and his colleagues [3] who redesigned a snack ordering website to encourage healthy choices by locating healthy snacks in the first two pages of the website and unhealthy ones in the last two. This simple modification of the environment, where individual’s make decisions, was able to nudge 53% of the participants to opt for a healthy snack [3]. One limitation of current technology-mediated nudges is the limited understanding of their long-term effects and whether nudging effects sustain after the removal of the nudge [4]. Persuasive techniques also hold great potential for motivating desired behaviours, for instance, promoting physical activity [5]. Design principles such as self-monitoring, tailoring and personalization are well-known and deeply studied in the human-computer interaction (HCI) field. For instance, self-monitoring is one of the most prominent theoretically informed techniques used in personal informatics tools to support an individual’s regulating own behaviours (eg, walking goals). One should notice that both nudging, and persuasion have the same end goals but rely on different principles to …