Today’s personal technologies are generally seen as reducing mindfulness. They introduce distractions, stress, privacy concerns and detrimental habits. This can cause an increase in behaviors that are misaligned with personal goals. Current attempts to use technology to improve well-being do not take advantage of some of the benefits that personal technologies have to offer. Specifically, they can intervene ”just-in-time” to nudge the user to reflect on their imminent behavior decision. This thesis focuses on designing mindful technology.