Google Health adds two-way Apple Health syncing on iPhone

Google Health on iPhone now supports two-way syncing with Apple Health. The change follows the May launch of the Google Health app, which shipped with the affordable Google Fitbit Air tracker line and at first only offered one-way Apple Health integration.

Under the original setup, Google Health could read data from Apple Health but could not write back into it. Two-way syncing means data can move in both directions between the apps, so metrics collected in either place can stay aligned instead of living in a single read-only path into Google Health.

For engineers and builders working on health and wearable products, this is a concrete interoperability fix on iPhone. Users who already keep history in Apple Health and also use Google Health or Fitbit Air no longer have to treat one side as a sink only. That reduces friction for anyone evaluating multi-vendor stacks rather than an all-Apple or all-Google setup.

The move also lands in a market where Apple Health is the default hub on iPhone and Google is pushing Fitbit Air as a lower-cost entry into its health stack. One-way import left Google Health dependent on Apple as a source. Two-way sync puts Google Health closer to a peer on the same device, which matters when users compare how well third-party health apps fit into an iPhone-centered routine.

What to watch next is how complete the write path is in practice—which data types go both ways, how conflicts are handled when the same metric updates in both apps, and whether Fitbit Air users see clearer value from keeping Google Health as the companion app rather than Apple Health alone.