Cycle Diary

A period tracker for iPhone

Your cycle, kept in one quiet place

Mark your days on one simple calendar. Cycle Diary works out your own rhythm from what you record, and tells you what is coming next.

Download Cycle Diary on the App Store See what it does

Requires iOS 17 or later · 65 languages

Headline “Period Tracker”, over a calendar month with period days marked in shades of red and a notification reading “Heavy flow expected tomorrow (5th December)”
Headline “Know your fertile days · Before they arrive”, over a calendar with the fertile window shaded in lilac, ovulation day marked, and a notification reading “Fertile window starts today”

What it does

Everything a cycle asks you to remember

A calendar, a diary and a set of predictions that come from your own record — not from a textbook average.

One calendar, filled in by you

Tap a date and mark the flow. The month colours itself in around it, so a glance is enough to see where you are.

Predictions from your own history

Your next period, your fertile window and the day flow is likely to be heaviest — worked out from the cycles you have actually recorded, not an average of strangers.

More than the dates

Every day can hold flow intensity, mood, symptoms, intimacy and a note in your own words.

A heads-up before it starts

Optional reminders seven days out, three days out and the day before — plus a nudge when your heaviest day is due.

Your pattern, side by side

Cycle history lists every cycle and every period with its own length, and keeps your running averages at the top.

Locked, and yours to keep

Lock the app behind Face ID or a PIN. Your entries live on your phone and sync through your own Apple Account — and a CSV export gives you a copy of the lot whenever you want one.

Screens

Take a look inside

Swipe or scroll sideways

  • Headline “All features free · In 65 languages”, over the language picker showing English, 简体中文, हिंदी, Español, العربية and more, and a note that 51 further languages follow
  • Headline “Period Tracker”, over a calendar month with period days marked in shades of red and a notification reading “Heavy flow expected tomorrow (5th December)”
  • Headline “Know your fertile days · Before they arrive”, over a calendar with the fertile window shaded in lilac, ovulation day marked, and a notification reading “Fertile window starts today”
  • Headline “Log not just the dates”, over the day log: flow intensity, mood, symptoms, intimacy and a notes field for a single date
  • Headline “See your own pattern”, over cycle history: average cycle and period length at the top, then each past cycle listed with its own length
  • Headline “Face ID or a PIN · Data stored on your phone”, over the lock screen asking for Face ID or a PIN before the diary opens

Languages

Written out in 65 languages

Chosen when you set the app up, changed whenever you like, and never switched behind your back.

English简体中文हिंदीEspañolالعربيةFrançaisবাংলাPortuguêsРусскийBahasa IndonesiaاردوDeutsch日本語Naijáالعربية المصريةमराठीTiếng ViệtతెలుగుHarshen HausaTürkçeپنجابیKiswahiliTagalogதமிழ்粤语吴语فارسی한국어ภาษาไทยBasa JawaItalianoગુજરાતીالعربية الشامية
አማርኛಕನ್ನಡभोजपुरीالعربية السودانية閩南語客家話RomânăAsụsụ IgboAfaan OromooУкраїнськаAzərbaycan diliਪੰਜਾਬੀଓଡ଼ିଆNederlandsမြန်မာဘာသာMalagasyΕλληνικάBahasa MelayuPolski繁體中文മലയാളംSvenskaMagyarČeštinaעבריתCatalàHrvatskiDanskSuomiSlovenčinaNorsk bokmålSlovenščina

Start your diary

Cycle Diary is on the App Store now. Download it, give the short setup a couple of minutes, and the calendar starts working out your rhythm from the first period you enter.

Open in the App Store

Cycle Diary is not a medical device. Its predictions are worked out from the dates you enter and are not medical advice, a diagnosis, or a method of contraception. Cycles vary, and a prediction can be wrong. Talk to a doctor or midwife about anything that matters.