What is Amazfit Multi-Device Activity Sync?

It is a feature in Zepp OS 6 that consolidates daily activity data — steps, calories, standing, and distance — across multiple Amazfit devices via the Zepp app. Previously, owning more than one Amazfit device meant fragmented totals. The sync resolves that by combining data from all connected devices into a single daily figure.

How does Amazfit Activity Sync compare to Garmin TrueUp?

Amazfit’s sync covers daily activity totals, which is equivalent to what Garmin’s original TrueUp did in 2016. Garmin extended that in 2018 with Physio TrueUp, which added syncing of training load, recovery time, and VO2 max across devices. Amazfit has not yet confirmed whether equivalent physiological data cross device boundaries.

Does the Helio Strap feed into HybridCharge on the Balance 3?

Zepp Health has not confirmed this. It is the key unanswered question. HybridCharge needs to see all training load to produce a credible readiness score. If a Helio Strap gym session does not feed the Balance 3’s score, the readiness metric is incomplete for users who train across both devices.

Which devices support Zepp OS 6?

Balance 3 and Balance Ultra launched with OS 6. Cheetah 2 Ultra and Bip Max follow in June, with Balance 2, T-Rex Ultra 2, T-Rex 3 Pro, T-Rex 3, Cheetah 2 Pro and Active 3 Premium scheduled for July. Active Max follows in August. No dates have been confirmed for Balance 1, Active 2 Round, Active 2 Square or Bip 6.