Track symptoms, understand patterns, and view predictions for your next six cycles, all from your COROS watch and app.
Set up cycle tracking
To get started, open your COROS app to the home page and scroll down to the Menstrual Cycle card. You’ll be guided through a few quick questions to help the app accurately predict your next six cycles. Answer as accurately as possible for the best predictions. If you are unsure, you can always tap "Skip" to move on.
- When did your last menstrual period start? (This is the first day of your most recent menstrual bleeding.)
- How long does each menstrual period usually last? (Count from the first to the last day of bleeding.)
- How long does each menstrual cycle usually last? (Count from the first day of one period to the day before the next one starts.)
If needed, you can update your period or cycle length anytime in the Menstrual Cycle Settings menu. Any changes you make will automatically adjust your future predictions.
How to log a period
To log a period, scroll along the top of the Menstrual Cycle page to highlight the desired date. Select the white circle underneath the date. The circle will turn solid pink, indicating a logged period. You can log any flow, cramps, or other symptoms below.
To log multiple days at once, select the calendar icon in the top right corner of the Menstrual Cycle page. Next, select "Log Period" in the top right corner. Select any days to log a period. You can also tap on any existing days to delete a logged period.
Making changes to your past periods or current period may change your predicted cycle length and predicted period duration.
How to log symptoms
Each day, you can record personal notes and log symptoms for fatigue, nausea, cravings, mood changes, and more. On predicted period days, you'll also have the option to log your flow and cramps. From the Menstrual Cycle page, scroll down to Symptoms to enter your information for the current day or historical days.
Period and ovulation reminders
*Available on PACE 3, PACE 4, PACE Pro, COROS NOMAD, APEX 2, APEX 2 Pro, APEX 4, VERTIX 2, VERTIX 2S
Choose which menstrual cycle reminders you'd like to receive on your COROS watch. To do so, open your COROS app to the Menstrual Cycle Settings menu.
Period Reminder: When enabled, you'll receive an alert on your watch a few days before your period is predicted to start, based on your preferences. This reminder appears at your set Wake Time, which you can adjust under Profile > Settings > Sleep Settings.
Ovulation Prediction: Turning this on adds your predicted ovulation days to the menstrual cycle calendar. You can also enable an Ovulation Reminder to receive an alert one day in advance, which will appear on your watch at your set Wake Time.
How to view your cycle on your watch and app
On your watch: On your COROS watch*, scroll down from the main watch face to the Menstrual Cycle widget. Your current cycle phase or predicted period is listed here. Press the dial to open the widget and scroll to view upcoming predictions.
*Available on PACE 3, PACE 4, PACE Pro, COROS NOMAD, APEX 2, APEX 2 Pro, APEX 4, VERTIX 2, VERTIX 2S
In your app: View your menstrual cycle on the Progress page (first page in the app). Your current cycle phase or predicted period is listed here. Select the menstrual cycle card to log a period, log symptoms, view your cycle history, and make adjustments to your typical cycle length.
- Cycle calendar: From the Menstrual Cycle card, tap the calendar icon in the top right corner. Your cycle history and predictions for the next 6 cycles are displayed here in a monthly view. A solid pink circle indicates a logged period, shaded pink indicates a predicted period, and blue indicates predicted ovulation.
- Training calendar: From the first page in the app, open your Training Calendar to view your logged and predicted periods alongside your current training plan and scheduled workouts.
- Cycle history: Your menstrual cycle history can be viewed in the COROS app. From the Menstrual Cycle card, select either "6 Cycles" or "Year" at the top of the page to view a summary of your most recent cycle data, including any logged symptoms.
How to delete a logged period
To delete a logged period, click the pink circle underneath that day. When the circle turns white, this indicates the period was successfully removed. You can also do this for historical predicted periods by selecting a previous light pink circle.
To remove periods from multiple days, tap the calendar icon in the top right corner of the Menstrual Cycle page. Then select "Log Period" and tap any solid pink days to delete the logged period for those dates.
Making changes to your past periods or current period may change your predicted cycle length and predicted period duration.
Frequently Asked Questions
The menstrual cycle feature is available in app version 4.2.17 or later. Make sure your COROS app is up to date from your phone's App Store.
In addition, the feature is only visible if your gender is set to Female. To update this, go to Profile > Settings > Profile > Gender, and select Female. If you later switch your gender settings back to Male, the cycle tracking feature will remain available.
COROS currently predicts your next six cycles based on the period and cycle lengths entered in your Menstrual Cycle Settings. Making changes to your past periods or current period will also change your predicted cycle length and predicted period duration. Adaptive or "smart" predictions may be added in future updates.
To improve prediction accuracy, please ensure your period length and cycle length are correct in your Menstrual Cycle Settings. And on days that you have a period, remember to log your period in the COROS app. If predictions seem off, you can adjust these settings at any time or delete misrecorded periods.
Period reminders are supported on PACE 3, PACE 4, PACE Pro, COROS NOMAD, APEX 2, APEX 2 Pro, APEX 4, VERTIX 2, and VERTIX 2S.
If your device is compatible but you didn't get a reminder, check your Wake Time in the app (Profile > Settings > Sleep Time > confirm the listed Wake Time is correct). Reminders are delivered at this time.
If you have multiple watches connected, check if the alert appeared on another device.
Yes! COROS predicts your next six cycles based on the period and cycle lengths in your settings, so irregular patterns may make predictions less accurate. Irregular cycles can still be tracked, but the accuracy of predictions is limited. It is recommend to manually log periods when they occur by tapping the white circle under the current day, and it will turn solid pink when logged. This in turn will adjust your future predictions.
Blue circles indicating ovulation won't appear in your calendar if:
- Your actual cycle length is shorter than 20 days, or
- Ovulation Prediction is turned off in Menstrual Cycle Settings.
Additionally, if your cycle length in the Menstrual Cycle Settings is less than 20 days, future cycle predictions will not show ovulation.
Open the Menstrual Cycle Settings menu and toggle off Ovulation Prediction.
Currently, cycle history in the COROS app cannot be exported or synced to third party apps. However, you can view your cycle history by selecting either "6 Months" or "Year" at the top of the Menstrual Cycle page to view your typical period and cycle length and historical logged symptoms.