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Android Apps > Health & Fitness > Once -A special period tracker
Once -A special period tracker icon

Once -A special period tracker

by (주)넵튠 · Health & Fitness · Free
On Google Play since June 2010 · Data updated 2026-10-18
Google Play

Once -A special period tracker is made and published by (주)넵튠. AppBrain is an independent app data site and isn't affiliated with (주)넵튠. The app name, icon, screenshots and description belong to (주)넵튠 and are shown as published on Google Play.

AppBrain's verdict

EstablishedPopularWell rated
Rating on Google Play
4.12
22,280 ratings
Installs
2.9 million
Last updated
August 2, 2026
Ads
Contains ads
Size
31.9 MB

Once -A special period tracker is popular, with 2.9 million installs. Users rate it well: 4.1 stars from 22,280 ratings.

User feedback

Ratings and reviews on Google Play

Comments on Once -A special period tracker for Android

★★★★☆ Raven Geroda · Feb 7, 2025
I've been using this app for years. But recently the app just stopped working. I was hoping to retrieve my data
★★★★☆ 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.
★★★★★ 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.
★☆☆☆☆ Meenakshi Bhardwaj · May 28, 2026
Easy to use and accurate unfortunately I am not able to log in from my registered email ID. It says there is no account associated with this. Kindly help.
★★☆☆☆ 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.
★☆☆☆☆ Belinda Abraham · Feb 9, 2021
I've used this app for 5 1/2 years. Never had a problem until the past couple of months. The ads are not in English anymore. I can't get past ad since it is not in English and I refuse click on something that could scam me. It's impossible to use anymore.

Google Play Rating history and histogram

15K
2K
1.6K
1.6K
2.4K

Store listing

By (주)넵튠, from Google Play

“An app for girls surfing the crimson wave, once a month”

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Screenshots by (주)넵튠, from the Google Play listing
Description by (주)넵튠 Written by the developer, not by AppBrain. Click to read.
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
Official page on Google Play

Safety and technology

Found in the app by AppBrain
Ads
Contains ads
Price
Free
Libraries
64
App size
31.9 MB
Needs Android
4.4+
Content rating
High

Technologies used by Once -A special period tracker

21 permissions · 64 libraries
Subscribe to see full permission and library details

Releases

Updates seen on Google Play
Version
5.5.1
Launched
June 2010
  • Aug 2, 2026UpdateVersion 5.5.1
  • Jun 22, 2026UpdateVersion 5.4.2
  • Aug 18, 2025UpdateVersion 5.4.0
  • Nov 22, 2023UpdateVersion 5.3.6
  • Oct 9, 2023UpdateVersion 5.3.4
Show all changes Show fewer

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Installs

Tracked by AppBrain
Last 30 days
0
Play install range
1+ million
Launched
June 2010

Installs over time

Once -A special period tracker has been installed 2.9 million times. Over the past 30 days, it has been installed 0 times.

Rankings

Google Play top charts

Google Play Rankings for Once -A special period tracker

This app is not ranked

About the app and developer

About Once -A special period tracker

Once -A special period tracker is a health & fitness app developed by (주)넵튠.

How many times has Once -A special period tracker been installed?

Once -A special period tracker has been installed 2.9 million times. In the last 30 days, the app was installed 0 times.

What is the rating of Once -A special period tracker?

Once -A special period tracker is rated 4.12 out of 5 stars, based on 22 thousand ratings.

Is Once -A special period tracker free?

Once -A special period tracker is free. The app size is 31.86 MB. The latest version available is 5.5.1. The last update was on August 2, 2026.

What are the requirements for Once -A special period tracker?

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 since June 2010.

App Performance Report

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Developer information for (주)넵튠

(주)넵튠

once@malang.kr

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Share Once -A special period tracker

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