HerRhythm: Period Tracker

HerRhythm is a calm, private period and cycle tracker. There is no account, no sign-up and no cloud: everything you log stays on your phone.

LOG A DAY IN SECONDS
Tap a chip on the home screen, or open Quick Log for the full picture — period and flow, pain, symptoms, mood, and a private note. Notes are encrypted on your device and are never included in a report or an export.

SEE WHERE YOU ARE
A cycle ring shows the day you are on and what is likely next. The calendar tells recorded days and estimates apart at a glance, with a legend that explains every marker.

ESTIMATES, CLEARLY LABELLED
HerRhythm estimates your next period, fertile window and ovulation day from your own history — and says so, every time. Cycles vary. An estimate is not a guarantee, it is not a diagnosis, and it must never be used as contraception.

INSIGHTS ONCE THERE IS SOMETHING TO SHOW
After two completed cycles you get averages, your usual range, cycle history and simple charts. Nothing is invented before the data exists.

LEARN
Twelve articles on cycles, flow, cramps, ovulation, PCOS, perimenopause and privacy — written from cited public-health sources, filtered to the profile's age and stage. General education, not advice about your situation.

FAMILY PROFILES, DESIGNED FOR PRIVACY
A parent can add a managed profile for a family member under 18, on their own device. Managed profiles never see advertisements, never see adult content, and have no account of their own. Children never get an account.

PRIVATE BY DESIGN
• No account, no sign-up, no cloud sync
• Your cycle data never leaves your phone
• No advertising ID is requested at all
• App Lock with your fingerprint, face or screen lock
• Discreet reminders that do not reveal what the app is about
• Export your own data as CSV or PDF — free, always
• Delete everything, permanently, from inside the app

WORKS WITH HEALTH CONNECT
Import period history you already have, and write back only the periods you confirm. HerRhythm never writes an estimate or a prediction.

HOME SCREEN WIDGET
Your next estimate at a glance — and it shows nothing at all while a managed profile is active.

HERRHYTHM PLUS
An optional monthly subscription that adds exactly three things:
• No advertisements
• Up to five family profiles instead of two
• The doctor-visit report: a printable summary of your logged cycles to take to an appointment

Core cycle tracking, all safety information, data export and every privacy setting are free, permanently.

HerRhythm is not a medical device and does not diagnose. If something about your body worries you, please speak to a healthcare professional.

Recent changes:
First release of HerRhythm for Android.

Log your period, flow, pain, symptoms and mood in seconds. See where you are on a cycle ring, and get estimates for your next period, fertile window and ovulation day — always labelled as estimates, never as contraception. Insights arrive after two completed cycles.

No account, no cloud. Your cycle data stays on your phone. App Lock, discreet reminders, CSV and PDF export, Health Connect and a home screen widget are all included, free.