FlowBell is a free browser-based hourly chime clock designed for deep work and focus sessions. When you're in flow, time slips away unnoticed — FlowBell gently rings twice at every hour and once at every half hour, keeping you passively aware of time without breaking your concentration.
No app to install, no account needed. Simply open the tab, click Start, and let the chimes run in the background. Use the schedule window to silence chimes during sleeping hours, and enable browser notifications for an extra nudge when you're working in another tab.
Perfect for remote workers, freelancers, students, and anyone who loses track of time during long work sessions. Works on any browser, on any device — completely free.