You choose the metrics
Logos requests HealthKit access for the categories you enable. Metrics you do not grant are never read, and access can be withdrawn in iOS Settings or from the app at any time.
Apple Health
AI summaries from your Apple Health data
Logos reads the Apple Health metrics you choose to share and turns them into a plain-language daily summary on iPhone and Apple Watch. Nothing is read without permission, and context is reviewed before it goes to cloud AI unless you choose to allow that type always.
How it works
Permission first, then context
Summaries built on device
Selected on-device data is prepared locally into wellness and planning context, so a summary can be assembled before any decision about cloud processing is made.
You see it before it sends
If a request needs cloud AI, Logos names the information included and its recipients first, and you choose whether to send it, allow that context type in future, or decline.
On the wrist
Daily summaries on Apple Watch
The daily summary is built for a glance: movement, heart, and sleep signals drawn from the HealthKit metrics you selected, alongside the assistant view. Because the summary is assembled from context you already permitted, checking it on the watch does not widen what Logos can read.
Health data rules
What Logos will never do with HealthKit data
Logos uses HealthKit data only to provide the wellness summaries and assistant context you ask for. It is not used for advertising, for marketing, for use-based data mining, or for sale to data brokers, and connected-app data is not used to train or improve generalized AI models. You can export local app data, delete local wellness and analysis history, reset local state, and request account deletion from the app. The privacy policy sets out the full detail, including which third parties are involved and what they are contractually required to do.
Scope
Wellness support, not clinical care
Logos is not a medical device. It does not provide diagnosis, treatment, emergency support, or clinical monitoring, and it is not intended for children under 13. Summaries are there to help you notice patterns and plan your day, not to replace advice from a clinician. If you want the same permission model applied to calendars, reminders, and connected accounts, see how Logos works as a private AI assistant.