People who are self-employed or have creative jobs need to come up with ways to self-motivate. I sometimes spent long hours at work, and at the end of the day realized that the minority of those hours was actually productive. One way of self-control that works for me is to keep an activity log in Apple Numbers, where I enter the duration and category of each activity I do during a work day as I go. At the end of the day, the spreadsheet displays an 'efficiency ratio' and a breakdown of how much time I spend on desk work, lab work, and procrastination. Aiming for a high efficiency ratio helps me battle procrastination.
However, using Numbers ojn iPhone for this is clunky, e.g. it involves too much tapping on tiny data cells. I will develop a dedicated app, "Efficionado", that will make keeping an activity log seamless and easy, ideally needing only 2 clicks for each new entry. New activities will be automatically timed, entered into a daily list, and displayed as charts. There will also be an option to send daily 'scores' to a friend or coworker to hold each other accountable, a concept that works incredibly well for workout trackers (like Fitocracy or Runkeeper).
Clickable mockup here:
Basically it would go something like this: