GlucenePrivacy at Glucene:
encrypted for you, seen only by you.
Last updated: July 2026
The short version
- Your glucose data is encrypted at rest and is only decrypted to answer your own signed-in request.
- We don't sell or share your data, and we run no advertising or third-party tracking.
- We collect the minimum to run the service — essentially your email to sign in.
- Your password is stored only as a salted hash; we can't read it.
- You can export or delete your data and account at any time.
What we collect
- Account — the email address you sign up with, and a securely salted-and-hashed password. We do not collect your name, phone number, address, contacts, precise location, or any advertising identifier.
- Glucose & CGM data — the readings your sensor or uploader sends (glucose values, trends, timestamps), so we can show them back to you.
- Things you log — optional entries you add yourself, such as insulin, meals, or medications.
- Connection credentials — if you connect a CGM source (e.g. LibreLinkUp or Dexcom Share), the credentials you provide.
How your data is protected
Encrypted at rest. Your glucose readings and any CGM-connection credentials are stored encrypted. They are decrypted only in memory, only to serve a request you make while signed in, and only ever your own data.
Encrypted in transit. All communication between your devices and Glucene uses HTTPS/TLS.
Your password. Passwords are never stored in readable form — only as a salted hash — so no one, including us, can recover them.
On your devices. Access tokens are kept in the device keychain, and data shared with widgets and complications stays in Glucene's private, on-device app group container.
How your data is used
We use your data solely to provide Glucene: to display your glucose across your devices, compute your statistics (time in range, GMI, averages, and so on), power your moments and logs, and deliver the features you turn on. That's it.
What we never do
- We never sell or rent your data.
- We run no advertising and embed no third-party ad or tracking SDKs.
- We do not build advertising profiles or track you across other apps or websites.
Sharing — only when you ask
Glucene only shares your readings with people you explicitly invite (for example, a family member or caregiver you add as a follower). You can revoke that access at any time, and no data leaves your account otherwise.
Retention
High-resolution readings are retained for a rolling window (about 90 days) to power your charts; beyond that we keep only compact daily summaries for long-range statistics. When you delete data or your account, the associated records are removed.
Your choices
- Access & export your data from within the app.
- Delete individual records, or your entire account and its data.
- Disconnect a CGM source, which removes its stored credentials.
Children
Glucene is not directed to children under 13, and we do not knowingly collect data from them. Accounts for minors should be created and managed by a parent or guardian.
Changes
If we update this statement, we'll revise the date above and, for material changes, notify you in the app.
Contact
Questions or requests? Email privacy@glucene.com.
Glucene is for informational purposes only and is not a medical device. It does not provide medical advice; consult your care team for treatment decisions.