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Pro Ability to run multiple timers at once
You can have as many timers as you want going at the same time. This is convenient for when one want to multitask.
For timers that will be used multiple time you can save the timer with custom name such as "boiling water" to the reuse it anytime you need.
Con Limited to preset alarm sounds only
A number of alarm apps let you pick your own alarm sound, sadly it seems most timer apps do not, this is one of them.