Private by architecture

Most period trackers ask you to trust their privacy policy. Artemis is built so you don’t have to trust much at all — the architecture does the work. This page explains, concretely, where your data lives and what would have to be true for anyone else to see it.

Your data stays with you

• On your device. Cycle records, notes, symptoms, and analysis are stored in a local database on your iPhone. They are not uploaded anywhere.
• In Apple Health. Temperatures and period logs live in HealthKit, under Apple’s health-data protections and your explicit permissions. Artemis reads your wrist temperature from Apple Health, analyzes it on the device, and keeps only the results — it never stores your raw temperature stream.
• Nowhere else. We run no servers. There is no Artemis account, no login, no email list. The app makes no network calls to anyone but Apple.

Nothing to track you with

Artemis contains no analytics SDKs, no advertising SDKs, no crash reporters, and no third-party code at all. Subscriptions are handled by Apple through the App Store. Apple’s rules also prohibit using HealthKit data for advertising or marketing — a restriction we’re glad to be bound by, and one we’d follow anyway.

Partner sharing, when you choose it

If you invite a partner, Artemis creates a single summary snapshot and shares it through Apple’s iCloud sharing — there is no Artemis server in between. You pick the visibility tier:

• Nothing — sharing paused, snapshot deleted.
• Phase only — the current cycle phase, no dates.
• Fertile window — phase plus fertile-window dates.
• Full detail — including the smoothed temperature curve (never the raw readings).

You can change the tier, pause, or revoke sharing at any time, and revoking removes the shared data. The share is private to the person you invited — it is never public.

What we can see

Nothing. We have no servers, no dashboards, and no way to query anyone’s cycle data. If we received a legal demand for your data, we would have nothing to hand over — the data isn’t ours to access.

The fine print

The legally binding document is the Artemis Privacy Policy. Artemis is not a medical device, provides predictions rather than diagnoses, and should not be used as a form of birth control.