If I start a timer on my laptop, will it show up on my phone?

Yes. Timers sync in realtime across every device you're signed in on. Start the clock on your laptop, walk away, and the same running timer is there on your phone — same project, same elapsed time, updating live.

Because there's one timer per workspace, there's never any confusion about which device is "the real one." Stop it anywhere and the entry saves everywhere. This is what keeps a freelancer who moves between a desk, a café, and a client site from losing billable minutes.