A study timer, not a Pomodoro timer
The Pomodoro technique uses fixed 25-minute work blocks. That's great for some tasks — but reading a dense chapter, working through a problem set, or writing an essay rarely fits a rigid cycle. This study timer is a simple stopwatch: study for as long as the work needs, then log the session. Over a day it builds an honest picture of where your time actually went.
Why log by subject
Tagging each session with a subject turns the timer into a study journal. At a glance you can see you spent two hours on chemistry and twenty minutes on history — which is usually the first step to rebalancing how you revise. The log resets each day and is stored only in your browser.