HerRhythm
HerRhythm: Period Tracker
Understand your rhythm. Plan with confidence.
A calm, private period, cycle, ovulation and fertility tracker for iPhone — built so your most personal health data never leaves your device.
Made for families
A mother can create a gentle, ad-free profile for her daughter (age 10+) — no phone, email, password or account needed for her. You record and review everything from your own device.
Honest predictions
Period and fertile-window estimates from a transparent, on-device calculation — shown as ranges with clear confidence, never false certainty. Estimates are not contraception.
Private by design
Health records stay on your iPhone. Notes are encrypted, App Lock hides the app behind Face ID, and nothing about your cycle is ever used for advertising.
Age-aware guidance
From preparing for a first period to perimenopause — articles, tips and features adapt to each profile's age and life stage, in reassuring, judgment-free language.
Insights that respect you
Cycle length trends, symptom patterns and calm charts with plain-language summaries — shown only once there's enough data to be meaningful.
Works with Apple Health
Optionally sync your own cycle history with Apple Health. You choose what's read and written; predictions are never saved as facts.
Your cycle is nobody's business but yours
HerRhythm has no cloud account, no health-data server and no third-party analytics. Core tracking, safety information and data deletion are always free — and always will be. Read the full privacy policy.
HerRhythm provides informational estimates only. It does not diagnose medical conditions, and fertility estimates must not be used as contraception. For medical questions, please consult a healthcare professional.