I was not happy with features and UX of other productivity trackers. Most of the time tracking software is made for controlling employees or for billing clients and I just wanted an automated productivity measurement. I tried RescueTime before but it was too expensive for its functionality ($72-108/year) and also collected all my tracked data on their servers. There is standalone ManicTime on Windows but OS X standal…
What is your long-term monetisation plan here then? One-time payment won't last forever, as we've seen from different programs lately.
A desktop app with no server component doesn't necessarily need aggressive monetisation because at a certain point it reaches feature maturity and doesn't need much more work. It sells itself while the developer works on other things.
Of course if you're looking to go beyond a "micro-isv/lifestyle" business and want huge growth it's a different sorry.