Aero Stopwatch: Lap Timer

A stopwatch that does one job properly. Aero Stopwatch is built around a single screen: a very large, very legible time, and the four controls you actually need. No sign-in, no ads, no upsell, and nothing on screen that is not the time. HUNDREDTHS OF A SECOND The display runs to centiseconds and reads from Android's monotonic clock rather than the wall clock, so changing your time zone, an automatic network time sync, or daylight saving cannot shift a running timer. Put the phone in your pocket and the elapsed time is still right when you take it out. LAPS AND SPLITS, AND THE DIFFERENCE BETWEEN THEM Most stopwatches give you one button and call it a lap. This one keeps both, because they answer different questions: - A LAP closes the current segment and starts a new one. Use it for repeats, intervals, and circuits. - A SPLIT marks the moment without closing the segment. Use it for checkpoints inside a single long effort. The lap panel slides up as you record, newest entry first, and a dedicated Lap History screen shows the whole session with segment time and cumulative time in separate columns. FULL-SCREEN LANDSCAPE Turn the phone sideways and the timer expands to fill the screen while the controls fade out. Tap anywhere at all to start or pause — no aiming for a button while your hands are busy. Turn it back and the full interface fades in again. A REAL DARK MODE Light, Dark, or follow the system, switched instantly from the menu. Dark means a true black background and white type, not a grey wash, so it is readable in a dark gym or a dark room without lighting up your face. KEEP THE SCREEN ON Turn on "Keep screen on" and the display stays awake while the timer runs, so a screen timeout cannot cost you a reading mid-effort. PRIVATE BY CONSTRUCTION, NOT BY PROMISE Aero Stopwatch is not built with the INTERNET permission. Not "we choose not to send your data" — the app is not capable of sending it. There are no accounts, no analytics, no crash reporting, no advertising SDK, and no tracking of any kind. Your times and laps live in memory while the app is open and are gone when you close it or tap Clear session; nothing is ever written to storage. The only permission the app asks for is WAKE_LOCK, which keeps the screen bright and grants no access to any data. SMALL AND FAST Under 5 MB to download. It opens straight onto the timer. DESIGNED, NOT ASSEMBLED Clean typography, generous spacing, and a strictly monochrome interface, so the only thing competing for your attention is the number you came to read. Aero Stopwatch is free, with no in-app purchases and nothing held back behind a paywall.

Updated for Android 16 compatibility. No changes to how the stopwatch works.