One Timer - Time Tracker

One Timer is the simplest way to see where your time goes. Create a session for each task, flip the switch to start, and flip it again to stop. That's it.

Only one timer runs at a time, so switching tasks is a single tap: starting a new session automatically pauses the last one. Your total for the day updates live at the top of the screen.

TRACK IN ONE TAP
• Create sessions like "Deep Work", "Client Calls" or "Workout"
• Start and stop with a simple switch; stopped sessions resume where they left off
• Starting one session automatically stops the others
• A live total shows all of today's time at a glance
• Recent names are one tap away, so you never retype the same task

ON YOUR LOCK SCREEN
• A Live Activity shows what you're recording and the running time on the Lock Screen
• On iPhones with Dynamic Island, your timer stays visible while you use other apps

BILLABLE HOURS, ROUNDED
• Switch between exact time (h:mm:ss) and rounded hours with one tap
• Round each session up to 6 minutes (0.1 h), 15, 30 or 60 minutes
• Totals add up the rounded values, ready for invoices and timesheets

A CALENDAR THAT DOES THE MATH
• Day, Month and Year views with totals for every period
• See each task's time per day, and drill down from a year to a month to a single day
• Add time you forgot to record, on any past date
• Edit or delete a day's time and every total updates automatically
• Starting fresh with Reset All keeps your history in the calendar

MAKE IT YOURS
• Long-press a session to reset it, rename it, set its time manually or delete it
• Every change is saved instantly, so nothing is lost if the app closes

PRIVATE BY DESIGN
No account, no sign-up and no ads. Your sessions are stored only on your device.

Whether you're a freelancer billing clients, a student tracking study hours, or just curious where your day goes, One Timer keeps it simple: one tap to start, one tap to stop.