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A smartwatch is able to run apps written by 3rd parties at expense of battery life (usually max 2 days). Some fitbit devices do allow 3rd party development (Ionic or Versa) but with lots of limitations. But in general, depending on the model, you still get things like call/message notification.
Sorry, there was a problem. Please try again later.Its, only dedicated to track fitness related activity, like steps counts. Smart watch on the other hand can do pretty much everything as a phone as well as fitness tracker.
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