Jigsaw figures out what you are doing by monitoring your phone's microphone, GPS and accelerometer for patterns characteristic of routine activities - and it could be set to send the results to social networking sites.
More importantly, Jigsaw can log how active you are each day, producing records that could be useful to a doctor or fitness trainer. Its pattern-recognition algorithms can identify a range of behaviours, making its logs more detailed than those of similar apps, says Hong Lu at Dartmouth College in Hanover, New Hampshire, who developed the app in collaboration with the Nokia Research Center in Palo Alto, California.
