A growth in the number of new APIs being created to act as quantified self data tools could lead to a new wave of personal health applications.Data streamed via quantified self APIs could also potentially create new empirical datasets to support emerging sciences.The Moves API, Pokelog API and a forthcoming Human API all point to greater interest in pulling personal data into new applications.The term “Quantified Self” refers to the idea of collecting, storing and analyzing personal data over a period of time.Surprisingly, the emergence of location-specific data tools and social media networks that encourage regular updating on how you are feeling and what you are thinking at any time, has not yet led to a zeitgeist-level interest in creating personal datasets from this information.