1. Home
  2. 💪 Health & Fitness
  3. Once(A special period tracker)
Once(A special period tracker)

Once(A special period tracker)

by Malang Studio Co. Ltd,

86 ratings
90 reviews
With Ads
🌟 Lifestyle
💪 Health & Fitness
Free
In-App PurchasesWith Ads

Details

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

Features

Developer

Malang Studio Co. Ltd,
✨Promote your app ✨
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
🧾$0.99
In-App Purchase↘︎
⭐90
Reviews↘︎
📝1+ tags
Tags↘︎
🔄6+ apps
Alternatives↘︎
❓5 answered
FAQ↘︎
📦~ in 1 month
Updates frequency↘︎
🖼️Get Icon
Icons↘︎

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
Show original description

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

Most RecentHighest RatedLowest Rated

Lost years of data

Not logging in to facebook anymore all my data is there
albhonestalbhonest

Good app.. but

I’ve had this app for many years and it’s been great up until recently.

The only thing I find annoying about this app is the ads when needing to add to the calendar.

It would be nice to not have to watch a video every single time I need to mark the start of my cycle.

Other than that this app has been great when tracking my cycle.
Show more
Gamer9022Gamer9022

리뷰 한 번도 해본적 없는데

달력에 주기대로 하는 건 원스뿐이고 몇년째 쓰는지 모르겠어요 감사합니다ㅜ 기가막히게 생리터지니까 밖에서 샐 일도 없고 다른 앱은 계산이 뭔가 이상한데 원스는 달마다 얼마치 했는지 간격은 어떤지 확인해줘서 최고의 앱입니다 삶의 질 상승ㅇㅇ 우리 오래봐요 원스..😌🩵
누누와윌럼프누누와윌럼프

Response from developer

안녕하세요. 원스 입니다. :) 원스를 사랑해주셔서 정말 감사드립니다! 응원의 댓글과 별점은 저희에게 큰 힘이 된답니다! 감사합니다.

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.
Kiim90Kiim90

Fix bug

The app wont let me log in. Hence i cant use the in app features
aaash19aaaaash19aa
See 85 more reviews

Developer apps

Subway Korea
Subway Korea

Korea Subway

🗺️ Navigation

(4.5K)

Free
In-App PurchasesWith Ads
1km -New relationships, Groups
1km -New relationships, Groups

by Malang Studio Co. Ltd,

🌐 Social Networking

(592)

Free
In-App PurchasesWith Ads
AlarmMon ( alarm clock )
AlarmMon ( alarm clock )

by Malang Studio Co. Ltd,

🌟 Lifestyle

(1.1K)

Free
In-App PurchasesWith Ads
Bubbly Pico!
Bubbly Pico!

by Malang Studio Co. Ltd,

💌 Stickers

(7)

Free
See 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.