Daily records
Record sensation, appearance, bleeding, manual markers, and the optional fields you choose to use.
Cycle and fertility awareness journal
Record and organize your observations with clarity.
A private space to record what you observe, keep your history organized, and share your tracking only with people you choose to authorize.
Available on the App Store and Google Play.
Recording is different from interpreting.
Natus organizes the information you enter. It does not automatically interpret fertility signs, predict ovulation or a fertile window, or determine fertile or infertile days.
Built for observation and recording
Everything you need to keep your tracking organized.
Chart and history
Review cycles and records in an organized view, without automatic fertility interpretation.
Reports
Generate reports from your records and review the content before sharing.
With your husband
Authorize your husband to follow and record information according to the permissions shown in the app.
Offline-first
Keep recording without a continuous internet connection after initial setup; synchronization resumes when connectivity is available.
Privacy from the start
Specific consent for sensitive data, access controls, consent withdrawal, and account deletion are built into the product.
Apple Watch and Wear OS
Natus on your wrist too.
On Apple Watch, check the current cycle day, start a record, review what was entered and save from your wrist. Natus also has a Wear OS version available through Google Play.
Shared tracking
Participation as a couple, with authorized access.
The tracking owner controls access and may invite her husband. Both receive clear notices about access to sensitive fertility, health, and intimate-life information.
Explicit invitationVisible permissionsRevocable access
Natus Content
See all content →Stories, information and practical guidance.
Personal story
From the calendar method to the Billings Ovulation Method®: 10 years of learning in our marriage
A personal story about family planning, marriage, faith, learning the Billings Ovulation Method® and the experience that helped inspire Natus.
Stories
John and Evelyn Billings: the story of the couple behind the Billings Ovulation Method®
Learn about John and Evelyn Billings and the decades of clinical observation and scientific research behind the development of the Billings Ovulation Method®.
Recording and organisation
Paper, spreadsheet or app: how should you organise your cycle records?
Compare different ways to organise cycle records and understand the advantages and limitations of paper, spreadsheets and dedicated apps.
Privacy
Your records remain under your control.
Natus uses local storage and cloud synchronization to provide continuity across connectivity states and authorized devices. Sensitive-data processing depends on specific consent.
Privacy Policy →18+Specific consentOffline-firstAccess control
Clear boundaries
Natus records. You observe, interpret, and decide.
- It does not diagnose or treat medical conditions.
- It does not predict ovulation or a fertile window.
- It does not determine fertile or infertile days.
- It does not recommend actions related to conception, contraception, or medical treatment.
- It does not replace instruction in a fertility awareness method or professional guidance when needed.
Frequently asked questions
Does Natus identify my fertile days?
No. The app records and organizes information entered by users, but it does not automatically classify days as fertile or infertile.
Does Natus predict ovulation?
No. Natus does not predict ovulation or a fertile window. Interpretive markers available in the app are entered manually by the user.
Can my husband participate?
Yes. The tracking owner may invite her husband. Access depends on an invitation, acceptance, and the permissions shown in the app.
Does it work without internet?
After initial setup, Natus uses an offline-first architecture for local recording and access. Synchronization, consent, and certain security actions require connectivity.
Does Natus replace an instructor or healthcare professional?
No. Natus is a recording and organization tool. When you need guidance about a method, diagnosis, or treatment, consult a qualified professional.
Can I delete my account?
Yes. Account deletion is available inside the app, and this website also provides a public deletion-request channel.
Natus
A private place for what you observe.