ChronoSum: Time Calculator

ChronoSum is a clean, fast calculator for adding and subtracting hours and minutes. Think of it as a duration tape — you key in a time, press + or −, and the running total updates instantly.

USE IT FOR • Flight time • Work hours and timesheets • Study sessions and exam prep • Workout duration • Project time tracking • Shift calculations • Travel duration • Freelance billing prep

FEATURES • Calculator-style keypad with real arithmetic semantics • Live calculation tape — every entry is visible and editable • Tap a row to edit, swipe to delete, swipe to flip + / − • Save calculations to local history; tap any history entry to reopen it • Share the result as a clean plain-text arithmetic block • Display the total as hours and minutes, compact (3h09), or decimal hours • Type a bare number as minutes or hours — your choice

PRIVACY All your calculations stay on your iPhone. ChronoSum has no account, no login, no backend, and no analytics. The only network traffic is the in-app banner ad served by Google AdMob.