Once -A special period tracker

Name: Once -A special period tracker
Rating: 4.15 (22769 reviews)
Author: (주)넵튠

By: (주)넵튠 App

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

Overview

Google Play Store

Downloads

2,939,331

Data as of 2026-08-22

Rating:

4.15 +7

(22,769)

Version:

5.5.1

Last updated: 2026-08-03

Ranking

#34,895 ▼ 99

Overall

Features & Capabilities

Once - A Special Period Tracker is a scientifically backed menstrual calendar app designed for women who want precise, easy-to-use tracking of menstruation, ovulation, and fertility. By calculating menstrual cycles more accurately over time, Once helps users anticipate periods, manage irregularities, and identify fertile windows and ovulation days at a glance.

With features such as alarm reminders for key dates, a secure diary to log symptoms and intimate details, and cloud data backup for seamless device switching, Once combines functionality with a neat, refined design tailored to women's needs. The app supports contraception management by tracking pill intake and forecasting pregnancy probability based on ovum and sperm survival periods. Overall, Once is a reliable companion for women seeking to take proactive care of their reproductive health in a discreet and user-friendly way.

User Growth & Download Statistics

App Privacy & Security

By:

(주)넵튠

Downloads:

2,939,331

Rating:

4.15

(22,769) 7 new ratings

Version:

5.5.1 Last updated: 2026-08-03

Version code:

2026080312

Creation date:

2010-06-14

Publisher country:

Permissions:

com.google.android.gms.permission.AD_ID Moderate risk
android.permission.ACCESS_ADSERVICES_AD_ID Low risk
android.permission.ACCESS_ADSERVICES_ATTRIBUTION Low risk
android.permission.ACCESS_ADSERVICES_CUSTOM_AUDIENCE Low risk
android.permission.ACCESS_ADSERVICES_TOPICS Low risk
android.permission.ACCESS_WIFI_STATE Low risk
android.permission.FOREGROUND_SERVICE Low risk
android.permission.INTERNET Low risk
android.permission.POST_NOTIFICATIONS Low risk
android.permission.RECEIVE_BOOT_COMPLETED Low risk

Size:

75.57MB

Email:

on*****@malang.kr

URLs:

Website ,Privacy policy

Full description:

Source:

Google Play Store

Data ingested on:

2026-08-22

Compare stats and ranking:

Ranking

# 34,895 ▼ 99

For Developers

Monetize with App Pass Boost with Extension Booster

Contact the developer

Chrome-Stats does not own this Android app. Please use these information below to contact the Android app developer.

Developed by:

(주)넵튠

Google Play Store

https://play.google.com/store/apps/details?id=net.android.wzdworks.magicday

Email:

on*****@malang.kr

Website:

https://assets.adxcorp.kr/redirect?url=https://apps.adxcorp.kr

User Reviews

Users praise the app for its simplicity, reliable cycle predictions, and easy access to long-term history. However, multiple reviews report recurring problems with logging in and restoring data when moving to a new device, as well as occasional startup failures. Ads are a common complaint, reducing the overall experience.

Pros

Easy to use with a simple, clear interface
Accurate period/fertility predictions and helpful insights
Long-term data retention with easy access to history

Cons

Repeated login issues and data loss when changing devices or with Facebook login (password reset problems)
App sometimes won’t start or open at all
Ads are intrusive/too frequent

Recent reviews

unfortunately I am not able to login from my registered email id. It says there is no account associated with this. kindly help.

Me*****, 2026-05-28

Used this app for 11 years. Deleted it after 11 years today. Ads are annoying, sure. But charging for an in-app purchase to remove ads for only 30 days, conveniently matching the length of a typical menstrual cycle, feels pretty degrading as a woman. I understand ads needed to keep the app going but having to pay every 30 days and it not being a one off is poor. I've moved over to Flo and manually transferred my period data there.