The cycle tracker that can’t read your data.
Artemis turns the wrist temperature your Apple Watch already measures into clear cycle insight — your current phase, when ovulation likely occurred, and what’s coming next. Analyzed on your device. Never on our servers, because we don’t have any.
Temperature
Your Watch already knows
Apple Watch measures your wrist temperature every night. Artemis reads it from Apple Health, filters out the noise, and detects the biphasic shift — the classical temperature pattern that shows the day ovulation likely occurred.
Partners
Share on your terms
First-class partner sharing with real controls: from cycle phase only, to fertile window, to full detail. You choose the tier, you can pause or revoke any time, and it moves through Apple’s iCloud sharing — not through us.
Privacy
Private by architecture
No account. No ads. No analytics. No third-party trackers. Your cycle data lives on your device and in Apple Health — we couldn’t sell it if we wanted to, because we never receive it.
How it works
- Wear your Watch to sleep. Series 8 or later measures wrist temperature automatically overnight — nothing to log.
- Artemis finds the pattern. Outliers are filtered, the curve is smoothed, and the biphasic shift is detected with the transparent 3-over-6 rule — no black box.
- See your cycle clearly. Current phase, estimated ovulation day, predicted next period — and, if you choose, a partner view that keeps someone you trust in the loop.