# MomoCalendar — Period, Ovulation & Fertility

> Simple period, ovulation, and fertility cycle tracker with smart predictions and daily logging. (iPhone/iPad app by SiU Ahn.)

- Source: https://appshunter.io/ios/app/momocalendar/id6769393682 (this page in markdown: same URL + `.md`)
- Developer: [SiU Ahn](https://appshunter.io/developer/1601025745)
- Category: Health & Fitness, Medical
- Price: Free
- Age rating: 4+
- Requires: iOS 15.0 · 38 MB
- Languages: American English, Korean
- Released: 2026-05-15
- Data updated: 2026-08-24
- Monetization: ad-supported
- User reviews in markdown: https://appshunter.io/ios/app/momocalendar/id6769393682/reviews.md

## What is MomoCalendar?

Never wonder when your next period is coming again.

MomoCalendar is the simplest cycle tracker. Log your last period start date once, and the app auto-predicts your next period, fertile window, and ovulation day. Track flow, pain, mood, contraception, and intimate relations privately — all in one beautiful calendar.


[ Key Features ]

▶ Smart Predictions
• Auto-predict next period, fertile window, ovulation day
• Personalized average cycle / period length (fully customizable)
• Toggle fertile window display ON / OFF

▶ Daily Logging
• Flow level (none, light, normal, heavy)
• Pain score 0–10
• Multi-select symptoms (headache, cramps, bloating, acne, and more)
• Mood (good, calm, sensitive, sad, anxious)
• Free-form memo

▶ Pill & Relations
• Separate logs for oral contraceptive + emergency contraception
• Private log for protected / unprotected relations

▶ Calendar + Statistics
• Beautiful month view at a glance
• Visualize symptom, mood, pill, and relation patterns over time
• Track average cycle length + prediction accuracy

▶ Reminders & Security
• Period start, ovulation day, and daily log reminders
• PIN-protected app lock — no one can open it without your code
• Light / dark theme + Korean / English UI


[ Made For You If ]

• Your cycle is irregular and predictions matter
• You're using natural family planning or trying to conceive
• You keep forgetting your daily pill
• You want to see symptom + mood patterns in real data
• You're tired of ad-stuffed, feature-bloated trackers


[ Privacy First ]

• Your data is encrypted in transit and tied to your account only
• No third-party sharing beyond ad personalization
• Full data deletion on account removal (server + device)
• PIN lock keeps your data safe even if your phone is lost


[ Account & Sync ]

• Sign in with Google, Apple, or Email
• Auto-sync across device changes or reinstalls


[ Contact ]

• Feedback: siwooeo@gmail.com
• Website: https://www.reactiveworks.dev

MomoCalendar is not a substitute for medical diagnosis or treatment. Always consult a qualified OB/GYN for any concerning symptoms.

## Key features

- Smart period and ovulation predictions
- Daily logging of flow, pain, mood, and symptoms
- Contraceptive and intimate relations tracking
- Calendar view with statistics and patterns
- PIN-protected app lock for privacy
- Reminders for period, ovulation, and daily logs

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/momocalendar/id6769393682/reviews.md

### 5/5 — 관계 횟수나 오르가즘 여부도 같이 표시할 수 있게 해주세요

*2026-08-10*

전체적인 디자인도 깔끔하고 좋은데 관계를 한 경우 관계의 횟수나 오르가즘의 여부도 체크할 수 있는 부분이 추가되었우면 좋겠네요

### 5/5 — 좋아요 깔끔하고 추천합니다

*2026-06-08*

쓸데없는 광고나 커뮤니티 없어서 좋아요 깔끔하고 직관적입니다! 
다만 증상 기능에 몸 상태나 기준 등이 추가되면 좋겠어요! 
(몸 상태 : 근육통 붓기 통증 감기 오한 허리통증 골반통증 관절통 등 / 기분 : 우울 짜증 피곤 화남 눈물, 감정기복 등 / 소화 불량, 식욕 상승, 식욕 감소/ 두통 등 ) 생리, 배란 전후 여러 증상 체크할 수 있으면 훨씬 유용할거같습니다!
생리일 예측은 기존 어플이랑 조금 다르게 나오는데 한번 확인해보려구요 
좋은 어플 개발 감사합니다~~

## Frequently asked questions about MomoCalendar

### What is MomoCalendar?

MomoCalendar is a cycle tracking application that helps users predict their next period, fertile window, and ovulation day. It allows for private logging of symptoms, mood, contraception, and intimate relations.

### How accurate are MomoCalendar's predictions?

The app auto-predicts your next period, fertile window, and ovulation day based on your logged data. It also allows for personalized average cycle and period length customization to improve prediction accuracy.

### Can I track symptoms and mood with MomoCalendar?

Yes, MomoCalendar offers daily logging for flow level, pain score (0-10), multi-select symptoms like headache and cramps, and mood tracking (good, calm, sensitive, sad, anxious). You can also add free-form memos.

### Is my data safe with MomoCalendar?

MomoCalendar prioritizes privacy with PIN-protected app lock, encrypted data in transit, and data tied only to your account. Full data deletion is available upon account removal.

### Does MomoCalendar have ads?

Yes, MomoCalendar contains advertisements. The app is free to use and monetized through ads.

### What platforms is MomoCalendar available on?

MomoCalendar is available for iPhone, iPad, and iPod devices. It supports both light and dark themes with Korean and English UI options.

### How often is MomoCalendar updated?

The latest version of MomoCalendar is 1.1.0, which was last updated on August 21, 2026. Updates typically include new features, bug fixes, and performance improvements.

### Can I sync my data across devices with MomoCalendar?

Yes, MomoCalendar supports account creation with Google, Apple, or Email, allowing for auto-sync across device changes or reinstalls. Your data is securely backed up and accessible.

## Version history (last 4 releases)

### 1.1.0 — 2026-08-21

• Statistics now has a range filter — 3 months, 6 months, 12 months, or all time.
• Average cycle and period length come from your last six cycles, so older records no longer flatten out where you are now.
• The next-period prediction follows that same recent average.
• Fixed a second edit erasing the first when two changes were made in a row on the same screen.
• You can reset a forgotten password by email, and signing up now verifies that you own the address.
• Fixed sign-in labels running outside their buttons, and gave every icon button a label.
• Tidied the stretched-out layout on iPad.
• Whether onboarding shows is now decided by your account, not the device, so it does not reappear on a new phone.
• The privacy policy link now opens the Korean document.
• The bottom banner sizes itself to the width of your device's screen.

### 1.0.4 — 2026-07-01

• Revamped the statistics charts — recent 6-month trend, actual vs predicted distinction, and better readability
• Added pull-to-refresh on the calendar and statistics screens
• Period auto-fill now follows your configured average period length
• Stabilized the bottom ad and fixed a crash that occurred on refresh

### 1.0.2 — 2026-05-18

First release — track period, fertile window, ovulation day, pill schedule, and relations on a clean calendar with auto-prediction, statistics, reminders, and app lock.

### 1.0.1 — 2026-05-15

No release notes.

## More apps by SiU Ahn

- [Cabling Trainer](https://appshunter.io/ios/app/cabling-trainer/id6764054792)
- [Promgrammer](https://appshunter.io/ios/app/promgrammer/id6764082868)
- [Korea Lotto 6/45 - QR Check](https://appshunter.io/ios/app/korea-lotto-645-qr-check/id6764383346)
- [Vocal Recorder - Sing & Notes](https://appshunter.io/ios/app/vocal-recorder-sing-and-notes/id6764782243)
- [Expiration Alarm](https://appshunter.io/ios/app/expiration-alarm/id6765717904)
- [Phocle - Photo Cleaner](https://appshunter.io/ios/app/phocle-photo-cleaner/id6765748720)

All apps by SiU Ahn: https://appshunter.io/developer/1601025745

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-24.*