Stream Natural Cycles data. Straight from the phone.
Natural Cycles writes menstrual flow, ovulation tests, and cervical mucus to Apple Health’s Cycle Tracking — and Sahha’s SDK reads them into your app as normalized reproductive tags, alongside every other source.
- On-device
- Apple Health
- iOS
- HIPAA
- GDPR
Free for 30 days · No credit card
- Menstrual flow
- Medium
- Ovulation test
- Positive
- Cervical mucus
- Egg white
Identical schema across 500+ sources
Your users connect Natural Cycles. Sahha does the rest.
This is your user’s side of the story — one screen, once. Sahha ingests every Natural Cycles signal, normalizes, deduplicates, and delivers it to your service — raw, or as refined intelligence your product can act on.
A Allow "your app"
On-device and permissioned
Natural Cycles data is read on the user’s own device, only after they grant Apple Health permission — nothing syncs without consent.
One integration, every source
Permission is per data type, not per brand. Anything that writes to Apple Health — Natural Cycles today, a new watch next year — flows through the same SDK with no extra prompt and no new code.
What Natural Cycles syncs through Apple Health.
Request only what you need
You choose exactly which of these signals to request from Apple Health — users are only ever prompted for those, which keeps opt-in rates high.
One schema, every source
Natural Cycles, Apple Watch, and Oura all return the same fields and units.
What crosses the bridge
Menstrual flow, ovulation tests, and cervical mucus pass through Apple Health; some app-exclusive metrics may not.
Cycle & reproductive
5
HealthKitSahha- menstrualFlowmenstrual_flowlight–heavy
- ovulationTestResultovulation_testneg–positive
- cervicalMucusQualitycervical_mucusdry–egg white
- intermenstrualBleedingintermenstrual_bleedingevent
- sexualActivitysexual_activityprotected/unprotected
See a real payload
{
"type": "HKCategoryTypeIdentifierMenstrualFlow",
"value": "HKCategoryValueMenstrualFlowMedium",
"startDate": "2026-06-03T00:00:00Z",
"endDate": "2026-06-03T23:59:59Z",
"sourceRevision": { "source": { "name": "Natural Cycles" } }
// …ovulation test & cervical mucus samples
}[
{
"category": "reproductive",
"type": "menstrual_flow",
"value": "medium",
"startDateTime": "2026-06-03T00:00:00Z",
"endDateTime": "2026-06-03T23:59:59Z"
}
// …ovulation_test & cervical_mucus tags
]Natural Cycles writes cycle-tracking entries to Apple Health, which Sahha delivers as reproductive tags (event values like menstrual_flow: medium) via API and webhooks. Basal body temperature stays in the app on most devices — Apple restricts third-party temperature writes except for connected thermometers. It’s an iOS app, so its data lands in Apple Health, not Health Connect.
Missing a metric you need? Talk to us in the Sahha Slack — if Natural Cycles captures it, we can usually add support.
Get more than just raw data
Sahha turns these signals into biomarkers, scores, archetypes, and insights — the modeling done for you.
Reading Apple Health yourself? Here’s the to-do list.
Everything on the left is yours to write, test, and maintain on iOS. Everything on the right, Sahha already did.
- Integrate Apple Health.
- Handle iOS version differences.
- Add Health Connect separately for Android.
One SDK covers Apple Health, Health Connect, and every cloud source.
- Write the HealthKit queries.
- Request the right permissions.
- Wire up background delivery.
The SDK handles queries, permissions, and background sync.
- Dedupe apps writing the same metric.
- Map dozens of HealthKit types.
- Reconcile against your Android sources.
Deduped, typed, one schema — one stream per user.
- Build a sleep model.
- Build an activity model.
- Hire a data scientist.
Scores, archetypes, and insights — built in.
- Apple changes a HealthKit API.
- You find out in production.
We version the SDK. You never notice.
No Natural Cycles developer account needed — Sahha reads what Natural Cycles already writes to Apple Health on iOS.
Live in an afternoon, not a sprint.
- # Add the Sahha SDKnpm install sahha-react-native01
Add the Sahha SDK
Drop the Sahha SDK into your iOS app — or React Native or Flutter. The same SDK also covers Health Connect for your Android sources.
- A
Allow “your app”
ConnectSleepActivityHeart rate02Prompt for Apple Health permissions
Call the SDK to show the native Apple Health consent sheet. The user chooses what to share — under your brand. It’s one prompt, ever: permission is per data type, not per brand, so every future source is already covered.
- Your app LIVESleep7h 12mReadiness82Heart rate62 bpm03
Sahha reads and delivers
Once permission is granted, the SDK reads Natural Cycles data from Apple Health in the background, normalizes it to one schema, and streams it to your app by webhook or API.
Most teams read live Natural Cycles data the same day they add the SDK. The only per-source prerequisite: your user has Natural Cycles’s Apple Health sync switched on — most source apps enable it by default.
Route it into your stack.
Sahha streams every update to your webhook — and a step-by-step guide takes it the rest of the way into your database, CDP, or messaging tool.
Natural Cycles integration questions
How does Sahha get Natural Cycles data?
Natural Cycles writes cycle-tracking entries to Apple Health, and Sahha reads them from there with its mobile SDK, delivering them as normalized reproductive tags — no Natural Cycles API to integrate.
How is cycle data delivered — as biomarkers or tags?
As reproductive tags. Cycle entries are categorical events (menstrual_flow: light/medium/heavy, ovulation_test: negative/high/positive, cervical_mucus: dry/sticky/creamy/watery/egg_white), delivered through Sahha’s API and webhooks alongside biomarkers and scores.
Does Sahha get basal body temperature from Natural Cycles?
Only for users with a connected thermometer. Apple restricts third-party apps from writing to Apple Health’s temperature fields, so on most devices basal body temperature stays in the Natural Cycles app while cycle entries still cross.
Do I need a mobile app to use the Natural Cycles integration?
Yes. Because Natural Cycles data lands in Apple Health on the user’s device, you embed the Sahha mobile SDK to read it. Cloud-only sources like Oura don’t need the SDK, but on-device sources like Natural Cycles do.
Is the Natural Cycles integration HIPAA and GDPR compliant?
Yes. Sahha is HIPAA and GDPR compliant and SOC 2 certified, and Natural Cycles data flows through the same compliant pipeline as every other source.
One API for every other source, too.
Add another wearable or app and the schema, webhooks, and scores are identical — no new pipeline to build.
Start streaming Natural Cycles data today.
Connect once. Sahha handles consent, normalization, and real-time delivery — for Natural Cycles and every other source.
Free for 30 days · No credit card
- One API for Natural Cycles and every other source
- Real-time webhooks + on-demand REST, one normalized schema
- Scores, archetypes & insights — no modeling required
- HIPAA, GDPR & SOC 2 · your brand on the consent screen