I'm Aiya, and I make Monthly Rose, a period tracker for iPhone and Android. This post is about the smallest part of it: the watch apps. There's a Wear OS app for Android and an Apple Watch app for iPhone. If you only want the links, here they are:
- App Store: https://apps.apple.com/us/app/monthly-rose-period-tracker/id6816627178
- Google Play: https://play.google.com/store/apps/details?id=cn.iyunci.yueji.gp
Why bother with a watch at all
A watch screen is tiny, and you look at it for a second or two. That's a good test for a tracker. On the phone it's easy to keep adding things, another card, another chart, another setting, and nobody notices for a while. On a watch you can't hide anything. Either the thing you need is right there, or the app is in the way.
So the watch apps stick to two jobs: showing where you are, and letting you log a few common things. Everything else stays on the phone, where there's room for it.
What the Wear OS app shows
The screenshot above is the Wear OS app's main screen. The ring shows your cycle day, under it is the phase you're in, and under that is how many days are left until your next period. Below that are three buttons: Log, Mood and Rosie.
Those numbers come from what you've logged, and they're estimates, same as the calendar on the phone. Monthly Rose isn't a medical device, and it shouldn't be used for contraception. I'd rather say that plainly on a screen this small than let a big number look more certain than it is.
The Log screen has one large button, "Period started", and three smaller ones for cramps, low mood and insomnia. A line at the bottom tells you to log other symptoms on your phone. A full symptom list on a round watch face means scrolling through tiny rows, and at that point you might as well take your phone out.
What the Apple Watch app does
The Apple Watch app (iPhone only) works the same way, short taps for common things:
- log the start of your period, plus symptoms and mood
- see your next period, your fertile window, and in pregnancy mode your pregnancy week and due date
- count kicks during pregnancy
- do pelvic floor exercises after birth
- say one sentence to Rosie by dictation
- add a complication to your watch face, so the basics are there without opening anything
The kick counter and the pelvic floor exercises come from the app's four modes: period, trying to conceive, pregnancy and postpartum. You can switch modes whenever you want. During pregnancy, counting kicks is easier on your wrist than on a phone you have to find first, and after birth the same goes for a short exercise.
Rosie on the wrist
Rosie is an AI companion in the app. On the phone you can type to her. On the Apple Watch you can dictate a sentence, which helps on days when even unlocking your phone feels like work. With your permission, Rosie sees a de-identified summary of what you've logged, like today's mood and where you are in your cycle, so her replies fit how you're actually doing. She's an AI, not a person, and she doesn't replace professional help. If you're struggling, please talk to a doctor or someone you trust.
The phone does the heavy lifting
The watch is the quick way in, and the phone is where the rest lives. That's where you see the calendar and predictions, set reminders for times you pick, and read ovulation test strips from a photo (nothing is saved until you confirm the result). It's also where you make the one-page A4 summary for a doctor's visit, as a PDF or as copied text, and export everything you've logged as JSON or CSV. iPhone users can also sync with Apple Health. The iOS version needs iOS 26 or later.
What it costs
No sign-up needed to log or to start your trial. You'll sign in when you subscribe, and encrypted cloud backup is turned on automatically when you do.
The price: 7-day free trial, then $5.99/month for Basic. No payment is needed to start the trial. Basic auto-renews, and you can cancel anytime in your App Store or Google Play subscriptions. Prices may vary by region, and the store shows the exact price before you pay. There are no ads and no pop-ups.
One question for you
If you wear a watch, what would you actually want to log from it? Period start, a few symptoms and mood seemed like the obvious ones, but I could be wrong. Small changes like this are easy for me to make, so please tell me in the comments.
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