SYNC connects to Clue through Apple Health, once you've granted permission for your cycle data to be shared.

To make sure SYNC has your latest Clue data, there are 2 steps:

1. Log your cycle in the Clue app
Once you've connected Clue to Apple Health, anything you track from that point onward — period days and flow — is synced across.

2. SYNC reads your data from Apple Health
SYNC then reads the available Clue data from Apple Health when you complete your daily check-in.

So, each day:
Clue → Apple Health → SYNC

Before you do your SYNC check-in:
Make sure you've logged today's entry in Clue. If your data isn't showing up in SYNC, try opening the Clue app once to be safe.

Why?
Clue only sends data to Apple Health that was tracked after you turned the integration on — anything logged before connecting won't carry across.

First-time setup:

1. Open Apple Health

2. Tap your profile icon

3. Go to Privacy → Apps

4. Select Clue

5. Turn on the data types you want to share with SYNC

Flo doesn't sync to Apple Health, so there's no automatic connection here, but that doesn't mean you're stuck. Just log your period dates directly in SYNC and everything else works exactly the same. Period flow and spotting can also be logged within SYNC, along with a wide range of symptoms.

To make sure SYNC has your latest Garmin data, there are 3 steps:

1. Sync your Garmin watch
Open the Garmin Connect app on your phone and let your watch sync.
This gets the latest data from your Garmin watch → Garmin Connect.
2. Garmin Connect sends your data to Apple Health
Once Garmin Connect has synced, your latest available data is pushed into Apple Health.
3. SYNC reads your data from Apple Health
SYNC then reads the available Garmin data from Apple Health when you complete your daily check-in.

So, each day:
Garmin watch → Garmin Connect → Apple Health → SYNC

Before you do your SYNC check-in:
Open Garmin Connect and let your watch finish syncing first. Then complete your SYNC check-in.

Why?
Garmin only sends new data to Apple Health when your Garmin device has synced with the Garmin Connect app. SYNC cannot access data that Garmin hasn’t yet pushed into Apple Health.

First-time setup:
You only need to set up your Apple Health permissions once:

1. Open Apple Health

2. Tap your profile icon

3. Go to Privacy → Apps

4. Select Garmin Connect

5. Turn on the data types you want to share with SYNC

SYNC can use Garmin data such as resting heart rate, heart rate during timed activities, sleep, steps, walking and running distance, and workouts. GPS tracks are not included.

To connect:

1. Open the Health app on your device

2. Tap your profile icon on the Summary screen

3. Go to Privacy → Apps

4. Select Garmin Connect

5. Turn on the data types you want to share

One extra step for Garmin specifically: open the Garmin Connect app and let your device sync before you do your SYNC daily check-in, so today's data is fresh. Garmin only pushes data to Apple Health when you manually sync your device through the Connect app — SYNC can't pull anything newer than your last sync.

To make sure SYNC has your latest Natural Cycles data, there are 2 steps:

1. Open the Natural Cycles app
Natural Cycles syncs your period data to Apple Health automatically each time you open the app — this is what triggers the sync, not a background timer.

2. SYNC reads your data from Apple Health
SYNC then reads your period start and end dates from Apple Health when you complete your daily check-in.

So, each day:
Natural Cycles → Apple Health → SYNC

Before you do your SYNC check-in:
Open the Natural Cycles app at least once if you've logged anything new — that's what pushes the update to Apple Health.

Why?
Natural Cycles only syncs to Apple Health when the app itself is opened. If you've logged a period date but haven't opened Natural Cycles since, SYNC won't see it yet.

First-time setup:

1. Open Apple Health

2. Tap your profile icon

3. Go to Privacy → Apps

4. Select Natural Cycles

5. Turn on the data types you want to share with SYNC

SYNC currently reads your period start and end dates. You can log period flow and spotting directly in the SYNC app.

Connecting Oura to SYNC
You can connect Oura to SYNC in two ways:

1. Direct Oura connection (recommended)
SYNC connects directly to Oura via the Oura API. This provides the best experience and gives SYNC access to your available recovery data.
You can grant access during onboarding or later in SYNC → Settings, following the instructions in the app.
Important: Before completing your SYNC check-in, open the Oura app and let your ring finish syncing first.

2. Via Apple Health
If you connect Oura through Apple Health, your data follows this path:
Oura ring → Oura app → Apple Health → SYNC
Each step needs to happen before SYNC can access your latest data.
Before your daily SYNC check-in:

1. Open the Oura app and let your ring finish syncing via Bluetooth.

2. Oura then sends the latest available data to Apple Health.

3. SYNC reads the available Oura data from Apple Health when you complete your check-in.

Setting up Oura through Apple Health
On your iPhone:

1. Open Apple Health

2. Tap your profile icon

3. Go to Privacy → Apps

4. Select Oura

5. Turn on the data types you want to share

SYNC uses available recovery signals such as resting heart rate, sleep and HRV.

Why do I need to sync my ring first?
Your Oura ring stores your data until it connects to the Oura app via Bluetooth. The latest data won’t be available to Apple Health—or to SYNC via the direct connection—until the Oura app has finished syncing with your ring.

To make sure SYNC has your latest Strava data, there are 2 steps:

1. Save your activity in Strava
Once an activity is recorded and saved in the Strava app, it's sent to Apple Health automatically — no extra step needed on your end.

2. SYNC reads your data from Apple Health
SYNC then reads the available Strava data from Apple Health when you complete your daily check-in.

So, each day:
Strava → Apple Health → SYNC

Before you do your SYNC check-in:
As long as your activity has finished saving in Strava, it should already be in Apple Health — no manual sync needed.

Why?
Strava sends activity data to Apple Health as soon as it's saved, provided "Send to Health" is switched on in your Strava settings.

First-time setup:

1. Open Apple Health

2. Tap your profile icon

3. Go to Privacy → Apps

4. Select Strava

5. Turn on the data types you want to share with SYNC

SYNC currently uses your activity and recovery data from Strava.

To make sure SYNC has your latest WHOOP data, there are 3 steps:

1. Let your WHOOP band sync with the app
The WHOOP app pulls data from your band automatically over Bluetooth.

2. WHOOP sends your data to Apple Health
Once connected, WHOOP automatically shares recovery and strain metrics with Apple Health.

3. SYNC reads your data from Apple Health
SYNC then reads the available WHOOP data from Apple Health when you complete your daily check-in.

So, each day:
WHOOP band → WHOOP app → Apple Health → SYNC

Before you do your SYNC check-in:
Open the WHOOP app once if you're not seeing today's data — this isn't strictly required, but it's the quickest way to make sure everything's synced through.

First-time setup:

1. Open Apple Health

2. Tap your profile icon

3. Go to Privacy → Apps

4. Select WHOOP

5. Turn on the data types you want to share with SYNC

SYNC uses your recovery and activity data from WHOOP — workouts, active energy, heart rate during activities, sleep, resting heart rate, respiratory rate, and steps if you've enabled that in your WHOOP settings.