Activity and sleep tracking are now table stakes for most consumer-facing wearable devices. But the world of health on wearables remains unknown territory: no one yet knows what services will work best for people, or how to deliver a good experience that doesn’t try to be one-size-fits-all. Pebble is exploring the breadth of potential health products by building experimental apps, collaborating with researchers, and opening our technical framework so that others can expand on what we build. Early examples range from apps to track mood and energy levels to programs that leverage cutting edge research to encourage physical activity.