An app for girls surfing the crimson wave, once a month
4.12·22,360 reviews·1,000,000+ downloads
About Once -A special period tracker
Once -A special period tracker is a health & fitness app developed by (주)넵튠.
Download Statistics
Once -A special period tracker has been downloaded 2.9 million times. In the last 30 days, the app was downloaded 0 times. It is ranked #103 in health & fitness.
User Ratings
Once -A special period tracker is rated 4.12 out of 5 stars. The rating is based on 22 thousand ratings.
App Information
Once -A special period tracker is FREE to download. The APK download size is 31.86 MB. The latest version available is 5.5.1. The last update was on August 2, 2026.
Technical Requirements
Once -A special period tracker requires Android 4.4+ or higher. The app has a content rating of High Maturity. The app has been available on Google Play June 2010.
Description
For the all women who need menstruation recording calendar For the all women who need caring dairy for irregular menstrual pain and menstrual cycle For the all women who want to know the fertility, ovulation, contraception and probability of pregnancy through calendar For the all women who annoys marking menstruation and contraceptive pill on the calendar every time. For the all women who secretly record the symptoms of her body on the calendar.
-- Must Have! Menstrual cycle management app, Once
[ We fulfill the standard of menstrual cycle management app!]
** Menstrual calendar being more accurate as more as you use! It smartly calculate your menstrual cycle that was really hard to expect when the menstrual pain will come. In the menstrual calendar, you can see the expected menstrual date, ovulation day which has high probability of pregnancy, fertility and taking contraceptive pill at a glance, In the calendar history, you can see menstrual cycle at a glance.
** Taking care of ovulation date and fertility! You can easily recognize the ovulation date, fertility and expected menstrual date at a glance, so you can take care of yourself more preciously.
** Scientific calculation of probability of pregnancy! Based on the ovum survival period for 24 hours and the sperm survival period for 3 to 5 days, the 1 day before and after the ovulation date have high probability of pregnancy. We are displaying the probability of pregnancy as middle in the fertility period.
** The day that needs preparing of body and mind, prepare in advance! The day, for not to be embarrassed! In the needful situations(expected menstrual date/fertility with high probability of pregnancy / ovulation date etc when you want), they let you know the day in advance with alarm and sensible messages.
** Save my precious every day records simply! Save your data in more easier and simpler way than diary.
If you sign up, you can store all the data that you record such as menstrual date, loving date, taking contraceptive pill, memo, auto calculated ovulation date and fertility period! Although you change your smartphone or install the app again after deleting, you can have data back in the menstrual calendar when you log in!
** Not only the menstrual date but also the secret love date! You can easily record the condition or symptoms of your body, the starting date of menstruation and menstrual pain.
Once will be my secret diary that even can record the secret loving date! You don't have to worry about that someone will secretly look your diary because it has a lock function.
** Neat and refined design catching women's mind! 'The pretty app is good to see and also good to use' refined and neat design enhanced the usability of the menstrual calendar. By simple menstrual calendar, you can see the expected menstrual date and fertility at a glance.
Like your cool diaries on your desk, Check cool designed calender application in your cell phone for your period.
--- * Request permission
WRITE_EXTERNAL_STORAGE ONES uses the authority of WRITE_EXTERNAL_STORAGE to save data
READ_EXTERNAL_STORAGE ONES uses the authority of READ_EXTERNAL_STORAGE to load data
GET_ACCOUNTS ONES uses the authority of GET_ACCOUNTS to improve its web environment. ---
Let's be with Once that always does the best to offer the best service :D ※ You can get a fast response if you send the question to 'once@malang.kr' :)
-- This service includes In-app Purchase items, and a separate fee will be charged for purchase.
Terms of Service : https://bit.ly/38zBlvj Privacy Policy : https://bit.ly/3iqaZ3g
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Comments on Once -A special period tracker for Android
★★★★☆Em· May 12, 2026
Please make a list view e.g. January 01/01/2026. Symptom - backache 01/01/2026. Symptom - food cravings 02/01/2026. Symptom - cramps 02/01/2026. Period starts - flow heavy 04/01/2026. Symptom - severe cramps 06/01/2026. Symptom - backache 06/01/2026. Period finishes February 03/02/2026. Etc... just a list view allows you to see patterns of symptoms more easily, and you can screenshot the list all in one go rather than having to click on each individual day one by one.
★★★★★Nikki Evelyn Overton· Jul 9, 2024
Love it!! I've been using this app for years now. It's normally always right on track with my period predictions. And it's really simple to use. I would recommend it to anyone.
★★★★★Amy Soaki· May 3, 2024
I do love using this app to track my period. I think it would be a helpful option to add if you're pregnant, and to be able to add when you ovulated (based on blood test or LH) to make it more accurate. Thank you.
★★☆☆☆Eshana Strothers· Nov 8, 2020
It was a decent app until they try to force me to agree to their terms and services (WHICH ISN'T IS IN ENGLISH BTW.) And I can't use the app until I agree to the terms and services, but I can't read the terms and services cuz it's not in English. So I guess I have to delete this app now.
★★☆☆☆Jennifer Walker· Mar 27, 2021
Used this app for years but the pop-up ads have gotten out of control. I don't even know how to close them because they're in Chinese. Super annoying and not worth it anymore. Bye, Once.
★★☆☆☆Aria dc· Nov 8, 2022
I have registered but I am unable to login. Please help mee. I click on the do u have registered account, then it says your account is registered. Then how am I able to log in?
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