No one can be productive all the time, but 'mprove' is a new menu bar add-on for MacOS that encourages users to make the most of their free time when they have it. The add-on tracks productivity in terms of a percentage of time spent, showing users how productive they've been based on how they make use of their free time.
To be sure, no one can be productive all the time. Even if one leaves aside things like a day job, travel time, sleep, and meals, the remaining free time is still tough to maximize completely. mprove lets users set their productivity goals for the day, and they can turn it on and off as they work (or take a break) during their free time.