Privacy Policy

Effective date: June 12, 2026

What Circa is

Circa is an iOS app that pairs your own lifestyle log (supplements, caffeine, nicotine) with physiological data from your Google Fitbit Air tracker, read through the Google Health API. It produces personal trend statistics and a nightly sleep forecast. Everything it computes, it computes on your iPhone.

Data Circa accesses

With your explicit consent, Circa requests these read-only Google Health API scopes:

• googlehealth.activity_and_fitness.readonly
• googlehealth.health_metrics_and_measurements.readonly
• googlehealth.sleep.readonly
• googlehealth.profile.readonly — used once, to greet you by first name

Circa never writes to your Google account and never requests broader access.

Where your data lives

On your iPhone — and only there. Health data is processed and stored in a local database on your device. Circa operates no backend servers. There is no cloud copy by default. If you switch on the optional iCloud backup, your data is stored in your own private iCloud database, inside your own Apple account, inaccessible to us.

What we never do

• No sale or sharing of your data — with anyone, ever.
• No third-party SDKs.
• No analytics, no tracking, no ads.
• No accounts on our side — there is no "our side."

Your supplement & stimulant log

Everything you log — substances, doses, times — is entered by you and stays on your device. The bundled supplement library is reference content shipped inside the app; your selections never leave your iPhone.

Data deletion

Disconnect & erase (Profile → Disconnect Google Health & erase) revokes Circa's Google token and wipes the local database immediately and permanently. This is the account-deletion path — because no server-side account exists, deletion is complete the moment it runs. Deleting the app from your iPhone likewise deletes all of its data.

Google API Services User Data Policy

Circa's use and transfer of information received from Google APIs adheres to the Google API Services User Data Policy, including the Limited Use requirements. Data obtained through Google Health API is used only to provide the app's user-facing features, on device.

Contact

levin.schwab@gmx.de

Changes to this policy

If this policy changes, the new version is published at this URL with an updated effective date. Material changes are called out in the app's release notes.