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Re:Show HN: Active Window Logger – Transparently capture usa... by cvs268 on Sunday October 18, 2015 @03:32PM (#10409442)
The goal is to have a lightweight tool that can absolve the user from the task of calculating how much time was spent performing the individual tasks over a given period (usually a day).

Useful when hooked-up with various GTD and Pomodoro tools, or for filling JIRA timesheets, or simply to measure your work-patterns on a typical day and plan for the next.

Re:Show HN: Active Window Logger – Transparently capture usa... by rposborne on Sunday October 18, 2015 @08:16PM (#10410415)
There are a few tools out there that use a similar paradigm.

RescueTime, uses the same principal (active focused window) https://www.rescuetime.com/

Wakatime, which is similar, but closer to your "goals" I think. Which issues "heartbeats" of open files / websites / w/e you want that can be related to a given project programatically. https://wakatime.com

Though generally just love this, I constantly strive to automate timekeeping for the trivial stuff.