Once(A special period tracker)

Once(A special period tracker)

by Malang Studio Co. Ltd,

84 ratings
51 reviews
Free
In-App PurchasesWith Ads

Details

  • Released
  • Updated
  • June 17, 2015
  • July 29, 2026

Features

Once(A special period tracker) screenshot #1 for iPhone
Once(A special period tracker) screenshot #2 for iPhone
Once(A special period tracker) screenshot #3 for iPhone
Once(A special period tracker) screenshot #4 for iPhone
Once(A special period tracker) screenshot #5 for iPhone
Once(A special period tracker) screenshot #6 for iPhone
iphone
ipad
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About

This app helps women track their menstrual cycles, predict ovulation, and estimate fertile windows. It offers a calendar view for period tracking, symptom logging, and pregnancy risk calculation. Features include customizable reminders and a home screen widget for quick access to important cycle data.

Period cycle tracking
Ovulation and fertile window prediction
Pregnancy risk calculation
Symptom logging
Customizable reminders
Home screen widget
Cycle-based tips
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What's New in Once(A special period tracker)

1.9.7

July 29, 2026

fixed bugs.

1

In-App Purchases

$0.99

Ad-Free Ticket (30days)

Ad-Free Ticket (30days)

User reviews

Wont log in to facebook

I recently got a new phone, im trying to log in with my facebook account and it won’t let me, I’ve been using this app for over 5 years now.

Response from developer

Hello, this is ONCE. We have received a response from Facebook regarding the issue preventing the use of Facebook login. Accordingly, we are sending individual notifications to members who use Facebook login. We will provide more detailed information through email inquiries. We kindly ask you to use the in-app inquiry feature. Thank you.

Synchronize

I’ve used this app for years and for the past one it hasn’t synchronized once to my Google acct and is now stating that my personal information will be deleted. Such an unfortunate thing to happen on this app that I use monthly to track my cycle. Please figure out the synchronize feature and lack of updating. User since 2017.
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Have to Watch an Ad Just to Record Data

It's incredibly annoying. I'm just going to remove the download and find another app or manually record my dates now because it's ridiculous that I have to watch a 30 second ad just to record my period.

No longer working

I’ve been using this app for years and it just suddenly stopped working The app keeps closing on me I can’t believe this all my data just gone

Response from developer

“Hello, this is ONCE. First of all, thank you for using Once’s service. Are you using the latest version? If you are using an older version, please update and use it. thank you."

App keep closing out

I’ve used this for years and loved it, but this week every time I try to open the app it just closes out!!

Developer apps

FAQ

What does this period tracker app do?

This app functions as a comprehensive period tracker, helping women log their menstrual cycles, predict ovulation dates, and estimate fertile windows. It also calculates the possibility of pregnancy and allows users to record symptoms and intimate days.

How accurate is the period prediction?

The app's period prediction becomes more accurate as you use it. It smartly calculates irregular period cycles and cramp. The fertile window and ovulation predictions are based on scientific calculations considering egg and sperm lifespans.

Is this app free to use?

The app is free to download and use, offering core period tracking and prediction features. It also includes in-app purchases for additional functionalities or content, and may display advertisements.

What are the key features of this app?

Key features include an estimated period calendar, ovulation and fertile window prediction, pregnancy percentage calculation, customizable reminders for important dates and contraception pills, a home screen widget for quick data access, and the ability to log symptoms and intimate days.

Who is this app designed for?

This app is designed for women who need a reliable way to track their menstrual cycles, understand their fertility, and manage period-related symptoms. It caters to those who want a simple yet functional tool for their reproductive health.