LodestarPrivacy Policy
Effective October 20, 2026
The short version: Lodestar processes your health data on your iPhone. We don’t run servers that receive, store or process it, we don’t sell it, and we don’t use it for advertising.
Who we are
Lodestar is an iPhone app made by Will Barry (“we”, “us”). You can reach us at lodestar.will@gmail.com.
Data we access
With your permission, through Google sign-in, Lodestar reads the following from your Google Health account (data recorded by your Fitbit device), with read-only access:
- Activity and fitness: steps, workouts (exercise sessions) and cardio fitness (VO₂ max).
- Health metrics and measurements: heart rate (including minute-by-minute readings), resting heart rate, heart rate variability, breathing rate, blood oxygen (SpO₂) and skin temperature.
- Sleep: sleep sessions, sleep stages and naps.
- Profile: your age, used to estimate heart-rate zones.
Lodestar cannot change, add to or delete anything in your Google Health account.
How we use it
Lodestar uses this data only to show you features in the app: daily scores (Battery, Sleep, Recovery, Effort, Stress), charts and trends, your personal baselines, sleep planning, alerts, widgets and notifications you turn on. All calculations happen on your device. Optional AI-written insights are produced by Apple’s on-device language model and are not sent anywhere.
Where it’s stored
Your health data and scores are stored only on your iPhone, inside the app’s private storage (and, for home-screen widgets, a small summary shared with Lodestar’s own widget on the same device). Your Google sign-in token is stored in the iOS Keychain. We have no copy. If your iPhone is backed up to iCloud or a computer, the app’s data may be included in that backup under your own account, as with any app.
What we share
Nothing. We do not sell, rent, share or transfer your data to anyone, including advertisers, data brokers or AI companies. We do not use it to train AI models. Lodestar contains no advertising, analytics or tracking software.
Google API Services User Data Policy
Lodestar’s use and transfer of information received from Google APIs adheres to the Google API Services User Data Policy, including the Limited Use requirements. Specifically, data from Google Health is used only to provide user-facing features within Lodestar; it is not transferred to others, used for advertising, or read by humans, and it is processed only on your device.
Purchases
If you buy a founding membership, the purchase is handled entirely by Apple through the App Store. We never see your payment details. Apple tells the app only whether the purchase is active.
If you email us
If you contact us by email (for example with “Email Will, the Founder” in the app), we receive your email address and whatever you choose to write, and use it only to reply. We don’t add you to any mailing list.
Your choices and deleting your data
- Export: Settings › Your Data › Export All Data saves everything Lodestar holds as a file you control.
- Delete: Settings › Your Data › Delete All Data on This Phone erases all stored data and signs you out. Deleting the app also removes it.
- Revoke access: remove Lodestar from your Google Account at myaccount.google.com/permissions at any time.
Children
Lodestar is not intended for children under 13, and we don’t knowingly process children’s data.
Changes
If this policy changes, we’ll update this page and the date above. Significant changes will also be shown in the app.