How does Cycle tracking work?

• About this feature
• What does Cycle tracking include?
• How to enable Cycle tracking
  • From the Home tab
  • From the Overview tab
• How to log your period
• Predictions
  • Where to see your predictions
  • How predictions work
• Viewing cycle data 
• Cycle details screen (iOS only)

About this feature

Menstrual cycle tracking is available to all users, but you can choose whether to enable it in Settings.

Cycle tracking helps you better understand your body by connecting your menstrual cycle with your daily health data—so you can gain deeper, more personalised insights.

Your cycle data is personal. We protect it with encryption and never share your health data with third parties. You’re always in control of what you track and who can see it.

For a deeper look at Menstrual Cycle Tracking, we invite you to read our blog.

What does Cycle tracking include?

Cycle tracking allows you to log and monitor:

• Period start and end dates
• Cycle length (from the first day of your period to the day before the next one)
• Flow intensity and patterns
• Predictions for your next cycle (if enabled on iOS)
• Ovulation days (iOS)

How to enable Cycle tracking

1. Access the Home tab
2. Tap Settings
3. Scroll down and tap Cycle tracking
4. Enable or disable the feature

You can enable or disable the following:

• Cycle predictions
• Ovulation and cycle phases (iOS only)

You can update:

• Hormonal birth control
• Period length
• Cycle length

How to log your period

You can log your period in two ways:

From the Home tab

1. Go to the Home tab
2. Tap the + icon (bottom right)

3. Select Log period

   

From the Overview tab

1. Go to the Overview tab

2. Tap Cycle at the bottom of the screen

   • If on iOS, tap Cycle details > View calendar
   • If on Android, tap View calendar

   

To log a period:

1. Tap any date in the calendar

2. Add your period details

   

Predictions

The app uses your past cycle data to estimate:

• When your next period may start
• When your current period may end
• Your cycle phase estimates, including follicular phase, fertile window, ovulation, and luteal phase (iOS).
• Your ovulation days (iOS).

The more cycles you track, the more personalized these estimates can become.

Where to see your predictions

• On iOS, your period predictions appear as empty drops in the Home card. On Android, you'll see your cycle day and period information.

  

  

• Period predictions also appear as red dashed circles in the calendar (iOS and Android)
• Fertile window is shown in blue in the calendar (iOS only)

• Ovulation is shown as a blue dashed circle in the calendar (iOS only)

  

• You can turn period predictions on or off at any time in Settings

  

• On iOS, you can also choose whether to show cycle phase estimates in Settings

How predictions work

When you have logged fewer than 6 recent cycles, predictions are based on your initial setup (your selected period length and cycle length).

As you log more cycles, predictions automatically update using your recent data for greater accuracy.

Turning period predictions off will hide and pause period predictions until you enable them again.

Viewing cycle data

In the Home tab:

Scroll down to view:

1. Your current cycle day
2. The number of days remaining until your next period
3. Your next cycle prediction (iOS only)

In the Overview: 

When cycle tracking is tapped:

• You’ll see red indicators (columns or dots) in your Overview charts and a bar with drop icons below your Overview charts.

  

• This allows you to compare your cycle data with:
  • Cumulative Stress
  • Intense Activity
  • Resting Heart Rate
  • Sleep
  • Heart Rate Variability
  • Skin Temperature

To hide cycle data from the charts:

• Tap Cycle again in the Overview

On iOS

Both Feelings and Cycle can be activated at the same time. When Cycle is active, a visual bar appears below the charts showing your cycle phases, each colour-coded for easy reading.

On Android

Only one toggle can be active at a time. When Cycle is selected, Feelings is greyed out. Period days are shown as red bars in your charts.

Cycle details screen (iOS only)

Note: This screen is currently available on iOS only. It's coming to Android soon.

How to access the Cycle details screen

To access your cycle details:

1. Tap Overview at the bottom of the screen
2. Select Cycle at the bottom of the screen

3. Tap Cycle details.

   

Reading your cycle details

On this screen, you’ll see a real-time summary of where you are in your cycle. Within Cycle details, you can also find your cycle averages and full cycle history. 

Depending on your settings, you can see:

• Your current cycle day and start date
• Your current cycle phase (when predictions and phases are enabled)
• How many days are left for your next predicted period

Cycle averages

Cycle averages are calculated based on your last 6 completed cycles and give you a snapshot of your typical patterns:

• Cycle length — the median number of days from one period to the next
• Cycle variation — the range between your shortest and longest recent cycles
• Period length — the median number of days from the first to the last day of your period

Note: The current cycle is not included in these calculations as it hasn't ended yet. Averages become available once you have logged at least 6 completed cycles.

Cycle history

Cycle history gives you a full overview of all your past cycles organised by year. For each cycle, you can see the cycle duration, date range, and phases.

When cycle phases are turned on, your cycle shows as colour-coded bars. Here's what each colour and symbol means:

• Red drops: your period days
• Blue bar: your follicular phase
• Green bar: your luteal phase
• Pill-shaped icon: your fertile window
• White dot: your ovulation day
• Filled triangle: today

You can swipe horizontally on cycle bars to see longer cycles that may not fit fully on screen.