Measurement (2 programs)
Pros: Track non-Mac related activities too. See charts showing the time you spent on your Mac. Shows active use and not background app use. Choose your own time frames for reports.
Cons: You may forget to time your non-Mac activities. Text in the user interface should be bigger. A timeline view showing all activities would have been nice. The ability to change chart colors should be added.
Pros: Multi-purpose calculator. Precise and accurate results. Multiple modules. No steep learning curve.
Cons: Entry conversions can be a bit tedious. App crashes possible. Input for dimensions only in decimal format. No in-app customer support.