The best stopwatch manager
Stopwatch App allows managing many stopwatches. You can add a stopwatch with name e.g. "Cooking dinner" or default number if you have no time for typing some text but you want measure the time precisely;)
App allows also backup your timers by localStorage(in webbrowser) so it would be on your browser until you clear cache.
App remembers the state of timers so when you starts timer, close your browser it will measure the time and will wait for your next visit;)