Focus session logger — measure your deep work
After each block of focused work, log what you did, how long it lasted, and a quick 1-to-5 rating of how deep the focus felt. The logger keeps a running list with total focused time and your average focus score, so patterns — your best times of day, tasks that drain you — become visible over a few sessions.
It is a private, browser-only notebook for your attention: nothing is uploaded, and the log clears when you close the tab.