Saga is the first true mobile lifelogging app. That is, this is the first time I can see my complete lifelog with location, photos, calendar entries, notes, and health information all unified right on my phone. Saga gets it right by making most of the logging automatic, including ingesting social media posts and taking a stab at places I've been (without having to remember to "check in" at the moment). During our years of lifelogging research, we dreamed of a commercial smartphone app like this and Saga has nailed it.
To the right is a screenshot from my lifelog, showing an event that was imported from my calendar ("daily standup"), lunch at Chevy's, and travel back to the office. Below, you can see how Saga renders my drive on a map.
They support BodyMedia, Fitbit and Withings data; they sync my gmail calendar; they load my trips from TripIt. They really get the power of bringing one's data together in one place.
This is the mobile app I wanted to build for MyLifeBits - and then some.