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Welltory vs Lens HRV: catalog facts
Welltory	Lens HRV
Freemium Free to start, with some features in a paid subscription.	Free Free and open source under the GPL-3.0 licence.
Android, iOS	Android
Combines data from wearables and phone measurements in one place Explains readings as plain guidance instead of raw numbers	Uses only the phone camera, no extra sensors Open source and available on F-Droid
Proprietary app with health data processed by the developer Not a medical device or a substitute for medical advice	Camera PPG is less precise than a chest strap Android only
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0
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 September 23, 2026	Official website Full listing and sources Checked October 2, 2026

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