A cycle tracker for women who want meaningful insight — not pastel wellness clichés.

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💌 Need a human? Email us here and you'll get a real reply, usually within two business days. Please include your iOS version and Apple Watch model so we can help faster.

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Quick start

You'll need:

• iPhone running iOS 17 or later
• Apple Watch Series 8, Series 9, Series 10, Ultra, or Ultra 2
• A habit of wearing the Watch to sleep

The first time you open Artemis:

1. Tap through the three-screen intro
2. Grant Apple Health permission to read wrist temperature and read/write menstrual flow
3. Log your most recent period if you can remember it — this anchors the cycle math
4. Wear your Watch to sleep that night, and the night after that

About 30 nights of sleep wear is when the algorithm has enough signal to call ovulation and a fertile window with confidence. Until then, the Today screen will say something honest like "Gathering temperature data." We won't pretend to know more than we do.

Frequently asked questions

Why does Artemis need an Apple Watch Series 8 or later?

Wrist temperature is the entire reason this app exists. The temperature sensor lives in Series 8 and newer Watches (and both Ultras). Earlier Watches don't have the hardware, full stop — there's no software workaround. You can still log periods and view your cycle history without a Watch, but the ovulation detection and fertile window predictions need wrist temperature data.

Why don't I see ovulation or a fertile window yet?

You probably need more nights of Watch wear. The biphasic detection algorithm needs at least one full cycle of overnight data — roughly 25–35 nights, ideally with the Watch worn each night. Gaps are okay; the algorithm handles them gracefully. But three nights of data isn't enough for any honest prediction.