Fitbit has no fewer than nine activity trackers in its portfolio. The latest in the line up is the Charge 3, which succeeds the excellent Charge 2fitness tracker from 2016. The Alta HR meanwhile, was introduced in 2017 and as its name suggests, it adds heart rate monitoring to 2016’s slim and stylish Alta tracker.

The addition of HR monitoring means the Alta starts to step into Charge territory. Starts being the keyword there though. There are quite a few features the Charge 3 has over the Alta HR. Here is how the two compare.
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https://www.pocket-lint.com/fitness-trackers/buyers-guides/fitbit/140467-fitbit-alta-hr-vs-charge-3-what-s-the-difference