Period Dial: Cycle & Ovulation

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About this app

No account. No sign-in. Your period records are stored only on your phone and are never sent to a server or used for ads.
Period Dial shows your menstrual cycle on a single round dial. The first screen tells you which day of your cycle it is, how many days until your next period, and which phase you are in.

YOUR DATA STAYS ON YOUR PHONE
- Start right after installing. No account needed.
- Period dates, symptoms, mood and notes are stored only on your device, and are excluded from cloud backup.
- Your cycle records are never connected to ads.
- Moving to a new phone? Use Export and Import in Settings.

YOUR CYCLE ON ONE DIAL
Your period, follicular phase, fertile window and luteal phase are shown in color, with a marker for today. Tap the dial for a plain-language explanation of what your body and hormones are doing right now.

CHANCE OF PREGNANCY, DAY BY DAY
Instead of just a date range, see the approximate chance of pregnancy for each day of your fertile window relative to ovulation, with an explanation of why. Useful as an ovulation calculator too.

PREDICTIONS THAT IMPROVE AS YOU LOG
From the period dates you log, Period Dial calculates your average cycle length and how much it varies, and predicts your next period, ovulation and fertile window. Irregular cycles get a wider range, and if you haven't logged for months, the app asks you to catch up.

LOG AND EDIT RIGHT ON THE CALENDAR
Tap days on the calendar to mark or clear period days. Past records and predictions appear on the same calendar. Spotting is logged separately so it doesn't throw off your cycle.

DAILY LOG AND STATS
Record flow, symptoms, mood, pain and notes, and log your mood with one tap from the first screen. Stats show how regular your cycle is, how your cycle length has changed, and when in your cycle symptoms tend to come back.

REMINDERS
Get a heads-up before your period, when your fertile window opens, around ovulation, before PMS and when your period is late, at the time you choose. Reminders are scheduled on your phone.

PLAIN WORDS FOR MEDICAL TERMS
Easy mode uses everyday words instead of terms like luteal phase and follicular phase. Tap any underlined term to see what it means, or search the built-in glossary.

ALSO
Light and dark themes, a layout that fits each screen without scrolling, and English and Korean.

Period Dial is free and shows an ad at the top of the screen.

Note: Predictions are estimates calculated from the dates you log and are not medical advice. Do not use them for birth control or to plan a pregnancy. If you are concerned about your health, talk to a healthcare professional.
No sign-up period tracker. Data stays on your phone. Your cycle on one dial.
Updated on
Nov 1, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
  • No data shared with third parties
    Learn more about how developers declare sharing
  • This app may collect these data types
    Location, App activity and 2 others
  • Data is encrypted in transit
  • Data can’t be deleted

What’s new

First release of Period Dial.
• No sign-up, and your records stay on your phone
• See where you are in your cycle at a glance
• Predictions for your next period, fertile window and ovulation
• Mark and edit period days right on the calendar
• Log flow, symptoms, mood and pain, with cycle stats
• Reminders before your period, for your fertile window and when you're late
• Plain words for medical terms