Daikon: Period Tracker
A cute calendar for your cycle
Free · In‑App Purchases
Log your period in one tap and see a colorful cycle ring with the next three predicted periods and fertile window. Reminders are optional, and no account is needed.
A little care, every day.
Daikon is a simple, joyful period tracker. Log your period, see what may be coming next, and let a few little white radishes brighten your day. When your period arrives, they turn into red carrots. On estimated ovulation day, one wears a flower.
YOUR RHYTHM AT A GLANCE
A colorful cycle ring shows period days, the estimated fertile window, ovulation, and today. See the next three predicted periods and upcoming fertility dates.
ONE LITTLE LOG
Tap “My period started” or “My period ended.” The babies jump, spin, and shower you with leaves. Edit past days in the calendar; neighboring days join automatically.
PREDICTIONS THAT KEEP GOING
Daikon learns from up to six recent cycles, or uses a cycle length you choose. If you haven’t logged a new period, estimates keep rolling forward. A gentle prompt helps you update your history.
GENTLE, OPTIONAL REMINDERS
Choose a period reminder, an estimated fertile-window reminder, or a “Did your period start?” check-in. All are off until you turn them on. Reminders are local notifications.
APPLE HEALTH, IF YOU WANT IT
Turn on “Sync to Apple Health” in Settings to save each logged period day as menstrual flow in the Health app. It’s off by default, reads back only what Daikon wrote, and keeps your Health data if you turn it off. “Delete all logs” also removes what Daikon wrote there.
PRIVATE LITTLE GARDEN
No account, symptoms diary, community, or subscription. Period history is stored on your device and can sync through your private iCloud when available. Your health data is never sent to the advertising SDK or used to target ads. If you turn on Apple Health sync, period days are also saved in Health.
On an unfolded iPhone Duo, a 13-inch iPad in portrait or any iPad in landscape, today and the calendar sit side by side.
Designed for iPhone and iPad, in English, Traditional Chinese, Simplified Chinese, Japanese, Korean, Spanish, French, and German, with a warm light and dark appearance and support for Reduce Motion.
Advertising: non-personalized interstitial ads may appear after logging and its animation finish, at most once every four minutes. Your first session is ad-free. Ads never block logging. A one-time “Remove ads” purchase in Settings turns ads off for good, with “Restore purchases” on your other devices.
Predictions are estimates, not medical advice or contraception. Cycle timing can vary.
Support: https://easonwumac.github.io/daikon/support.html
Privacy: https://easonwumac.github.io/daikon/privacy.html
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Sync to Apple Health: turn it on in Settings to save the period days you log to Health. It's off until you turn it on, and Delete all logs also removes what Daikon saved there.
Remove ads: a one-time purchase in Settings removes all ads for good, with Restore purchases for your other devices.
The developer, Yi-Chiun Wu, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Location
- Identifiers
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Yi-Chiun Wu
- Size
- 5.5 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 26.0 or later.
- iPhone
Requires iOS 26.0 or later. - iPad
Requires iPadOS 26.0 or later.
- iPhone
- Languages
English and 7 more
- English, French, German, Japanese, Korean, Simplified Chinese, Spanish, Traditional Chinese
- Age Rating
9+
- 9+
- Contains
Advertising
Health or Wellness Topics
- In-App Purchases
Yes
- Remove ads $9.99
- Copyright
- © 2026 ICHUN WU