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Health Sync vs Cairn: catalog facts
Health Sync	Cairn
Paid Paid app; the site describes its pricing as affordable but the research does not give…	Free Free and open source under the MIT licence.
Android, iOS	Android
Supports many fitness platforms and wearables Historical data sync and activity filtering	Exports to an open standard format, Open mHealth JSON Data goes only to your own Nextcloud
The iOS version supports fewer services than Android Exact pricing is not shown on the homepage	Requires a Nextcloud server Very new project with few users
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: MIT
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.