MomoCalendar
Period, Ovulation & Fertility
Free · Designed for iPad. Not verified for macOS.
Log your last period once — get auto predictions for next period, fertile window, and ovulation day. Track flow, pain, mood, pill & relations. PIN-locked.
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.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
First release — track period, fertile window, ovulation day, pill schedule, and relations on a clean calendar with auto-prediction, statistics, reminders, and app lock.
The developer, SiU Ahn, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- User Content
- Identifiers
- Usage Data
- Diagnostics
Data Linked to You
The following data may be collected and linked to your identity:
- Contact Info
- User Content
- Identifiers
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Identifiers
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- SiU Ahn
- Size
- 38.9 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPad
Requires iPadOS 15.0 or later. - iPod touch
Requires iOS 15.0 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English and Korean
- Age Rating
4+
- 4+
- Contains
Advertising
- Copyright
- © 2026 SiU Ahn