LunaLuna has been supporting women's menstrual cycles for over 20 years! ! Over 23 million downloads! !
It's a free period tracking app packed with information women care about, such as your next period date, ovulation date, fertile/infertile periods, best times for dieting, and daily health!

◇◆Overview◆◇
When your period starts, simply enter your period date.
That's all it takes to get notifications about your next expected period date (period date prediction), expected ovulation date (ovulation date prediction), best times for dieting, skin condition, and other information about your body and mind!
The more you record your period dates, the more accurate the prediction becomes, tailored to your cycle! It's a very convenient health management app for women that makes period prediction easy.

◇◆LunaLuna's Unique Algorithm◆◇
LunaLuna offers its own unique ovulation prediction algorithm, developed based on data accumulated by LunaLuna for over 15 years. (*Patented)
It will inform you of your expected ovulation date and pregnancy probability tailored to your menstrual cycle!

◇◆LunaLuna is now available at medical institutions!◆◇
Data recorded with LunaLuna can be used in consultations at gynecology and obstetrics clinics nationwide.
The number of medical institutions that have introduced "LunaLuna Medico" is expanding nationwide!

◇◆Features of the LunaLuna App◆◇
・The next period date is clearly displayed on the home screen with a countdown. You can see the specific expected period date, expected ovulation date, and high/low pregnancy probability at a glance by opening the app!

・When your period date is approaching, a record button will be displayed on the home screen. You can easily record each period with just a few taps.

* Your menstrual cycle and your physical and mental health are actually closely related. We deliver five indices (advice) – "Body," "Mind," "Diet," "Skin," and "Beauty" – updated daily, 365 days a year, tailored to your menstrual cycle!

* When you want to plan ahead, check your expected period/ovulation dates on the calendar! You can check up to 3 months in advance, so you can use it for travel planning and more.

◇◆Basic Functions◆◇
1. Period/Ovulation Prediction
Based on the start dates of your recorded periods, we predict and notify you of your next period and ovulation dates.

2. Prediction of Pregnancy Probability
We calculate your menstrual cycle from your recorded periods and predict and notify you of your current pregnancy probability (days when you are more likely to get pregnant/days when you are less likely to get pregnant).

3. Daily Updated Index (Health Advice)
Premenstrual irritability, bloating, and skin problems during menstruation are closely related to changes in female hormones and your physical condition. Lunarluna's index (health advice) informs you of your physical and mental state every day.
The content changes 365 days a year, so checking it each morning helps you plan your day.

4. Calendar
You can check your next expected period date, expected ovulation date, and periods with a high probability of conception on the calendar. It's also convenient to record your physical condition for the day by tapping the date.
You can also record appointments such as "hospital visits" and "dates."

5. Health Management
Easily record your daily physical condition.
You can easily record your physical condition and mood during menstruation, menstrual cramps, menstrual flow, and irregular bleeding with a single tap, allowing you to notice your discomfort and changes, and prepare in advance.
Having a record is also helpful when visiting a doctor.

◇◆Services Tailored to Your Life Stage◆◇
Women's lifestyles vary depending on their age and circumstances.
To meet these changing needs, Lunarluna offers a variety of stages and modes.

・Junior Mode
This mode is for elementary and junior high school students, usable from before their first period.
Before their first period, it helps you estimate when your first period will occur. After their first period, it supports you through irregular periods, allowing you to manage your expected period date and menstrual cycle.
In addition, we deliver columns about your first period tailored to your age. This mode has a simple and cute design.

・Pill Mode
This mode is for those taking birth control pills.
It helps you with daily medication adherence with medication records and reminder alarms to prevent missed doses.

・Pregnancy Hoping Stage
This stage is for those hoping to conceive.
"Intimacy Day" is Lunarluna's unique ovulation prediction algorithm developed based on data accumulated by Lunarluna for over 15 years. (*Patented) We'll pinpoint your most fertile days.
* "Intimate Days" is a premium course feature.

* Pregnancy Stages
During pregnancy, use our sister app, "LunaLuna Baby"!
We'll deliver daily updates on your baby's development.

* Aging Mode
This mode is for those experiencing menstrual cycle irregularities due to age, or those concerned about pre-menopause or menopause.

◇◆Introducing the Premium Course◆◇
Packed with even more comprehensive support features than the free app!
Here are some of the paid features. *Subscription is optional
* "Intimate Days" with High Conception Probability
* Constipation & Communication Index
* Extended Period and Ovulation Prediction
* Ask the Doctor
* Self-Check
* Partner Sharing
* Health Report & Data Analysis
* Ad Banner Removal
* Some ad banners within certain services will not be removed.

https://sp.lnln.jp/support/terms

https://www.mti.co.jp/?page_id=17

◇◆Contact Us◆◇
While our staff also reads your reviews as valuable feedback and opinions, we are unable to respond directly or individually.
We apologize for the inconvenience, but if you have any problems, inquiries, or requests, please contact us via:

App Launch > Bottom Right "Menu" > "Customer Support" at the bottom of the page > "Help/Contact Us"

Thank you for your many reviews. They are a great encouragement to all of our staff.

If you are unable to launch the app, please contact us using the link below.

https://sp.lnln.jp/brand/terms/contact

◇◆Other Notes◆◇
【1】The default installation location is the device's internal memory.
If the device's internal memory is insufficient, installation may not be possible.
In that case, we apologize for the inconvenience, but please move files stored on the device to an SD card to free up space before installing.
(This app can also be manually moved to an SD card after installation. Please change this in your device's "Settings").

【2】Depending on your device and PC's sync settings, the icon may disappear from the device's home screen after syncing with your PC following app installation. We apologize for the inconvenience, but in that case, please re-add the icon and check your sync settings.

(The app will not be uninstalled automatically, and your data should remain even in this case, but please check.)

[3] For customers using the "+HOME" app
After updating the app, you may not be able to open the icon displayed on the home screen of the "LunaLuna" app.
We apologize for any inconvenience this may cause.
You can open it from the home screen icon by following the steps below.

*Please be careful not to delete the app.
1. Delete the app shortcut on the home screen.
2. Create a shortcut on the home screen again from the app list.
*Download figures are as of April 2026.