Period Tracker & Ovulation Calendar
Estimated period and ovulation dates, symptom tracking, and daily care for women’s health.
Take control of your cycle!
Scan to download the app🧡 What is Selin
Selin — a smart period calendar for cycle, ovulation, PMS & fertility tracking
Selin is a modern app for tracking your menstrual cycle, ovulation, symptoms, and mood.
It helps you better understand your body, recognize patterns across the phases of the menstrual cycle and consciously manage your well-being.
Who Selin is especially helpful for
- women who are planning pregnancy;
- those who want to record cycle information and view estimated fertile days;
- anyone dealing with irregular cycles, stress, or changing sleep schedules;
- those who experience PMS, mood swings, or energy fluctuations.
What Selin gives you every day
- shows the connection between your cycle, well-being, and mood;
- helps you prepare in advance for your period, ovulation, and PMS;
- creates a sense of control and calm around your body;
- offers a convenient all-in-one space for daily self-care.
Selin helps you feel calmer, understand changes in your body, and know what to expect
on different days of the month — whether you simply want to understand your cycle better or are actively planning conception.
We also provide in-depth guidance on heavy periods and menstrual cramps, along with practical recommendations to help you better understand your body.
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Selin Features
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Smart Cycle Calendar
A clear and easy-to-use calendar that automatically adapts to your cycle using the cycle information you record.
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Ovulation & Fertile Window
Selin shows estimated fertile days and estimated ovulation. These dates do not confirm ovulation.
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Pregnancy Planning Support
Keep period, symptom and temperature records to discuss with a healthcare professional when planning pregnancy. The app does not calculate your individual chance of conception.
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Smart Reminders
Selin notifies you in advance about your period, ovulation, PMS, and important days
so you’re always prepared.
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Mood, Energy & Symptom Tracker
Track your mood, sleep, well-being, PMS, pain, and any changes.
Selin analyzes patterns and helps you understand how different cycle phases affect your body.
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Clear Analytics
Visual charts and statistics clearly show changes in your cycle, mood, and symptoms — all in one place.
Download Selin and start tracking your cycle today!
💡 Why Selin
How Selin helps you understand your cycle
Selin brings your recorded cycle information together in one place.
You can review recorded dates, symptoms and mood together. Estimates may be less useful when your cycle length varies.
Selin shows how your menstrual cycle affects mood, energy levels, productivity, and overall well-being. You don’t just see predictions — you discover patterns that help you better understand your body.
For pregnancy planning, Selin provides estimated cycle dates and a place to record observations. A predicted fertile window does not confirm ovulation or establish the chance of conception.
Selin is suitable for teenagers, adult women, and anyone who is just starting to track their cycle. The interface remains intuitive, while reminders are gentle and non-intrusive.
Selin helps you feel calmer, better understand changes in your body, and know what to expect on different days of the month.
If your cycle feels unusual — heavier bleeding, increased pain, or discomfort — visit the Knowledge Hub, where you’ll find articles explaining possible causes and practical support recommendations.
How does Selin work?
Selin is a smart menstrual cycle calendar that analyzes your data and provides estimates for your period, ovulation, PMS, and fertile window.
The app works in three simple steps:
1. You enter your cycle information
At the start, Selin asks for the date of your last period, your average cycle length, period duration, and preferred reminders. This information creates a personalized
foundation for your cycle.
2. Selin analyzes changes in your body
Selin uses recorded cycle dates to provide estimates. Symptom and mood entries help you review your own history; they do not measure hormone levels or establish a cause for changes.
3. The app provides predictions and sends reminders
Selin automatically predicts your next period, calculates ovulation, fertile days, and PMS, analyzes symptoms, and reminds you about important actions — vitamins, hygiene products, cycle-related events, doctor visits, and more.
You can also learn more about menstrual symptoms and how tracking them can help you notice patterns over time.
Who is Selin for?
For women with regular and irregular cycles
Selin adapts to your real cycle, accounts for changes,
and helps you better understand your body’s signals.
For women who want to track mood and well-being
Mood, energy and symptom records help you review patterns in your everyday well-being.
For anyone who wants less stress before their period
PMS estimates, tips, and reminders help you
prepare in advance and feel calmer.
For partners who want to be more supportive
A dedicated Partner Mode lets you see important dates
and receive reminders — helping build caring and supportive relationships.
Why choose Selin?
A cycle overview for partners
Selin Partner Mode brings cycle information into a Today overview, helping you refer to recorded dates and cycle estimates when planning support.
Reminders beyond cycle dates
Keep doctor appointments, birthdays and custom dated reminders alongside cycle information. Reminder availability and limits can depend on your subscription and app version.
Separate profiles and notes
Keep separate partner profiles with their own notes, preferences and reminders. Record another person’s information only with their agreement.
How Selin compares with other cycle tracking apps
Selin is a period-tracking app for recording menstrual cycle dates, symptoms and mood. It combines estimated cycle dates with Partner Mode for profile-based planning, notes and reminders. Learn more about Selin for Partners.
| Feature | Selin | Flo | Clue |
|---|---|---|---|
| Period tracking | Record period dates | Record periods and view predictions | Period Tracking mode |
| Fertile-window estimates | Estimated ovulation and fertile days | Predicted ovulation and fertile days | Fertile-window predictions with Clue Plus; fertile-day predictions in Clue Conceive |
| Symptoms and mood | Record symptoms and mood | Log symptoms, moods and events | Track experiences, including symptoms and feelings |
| Partner experience | Profile-based planning with separate notes and preferences | Flo for Partners: calendar, tailored insights and optional couples quizzes | Clue Connect: cycle-phase sharing; sharing requires Clue Plus, viewing is free |
| Partner cycle overview | Today overview for contact profiles | View-only cycle calendar and tailored insights | Calendar View; mood, energy and pain logs are not shared |
| Custom partner reminders / important dates | Doctor appointments, birthdays and custom dated reminders; limits may apply | Custom partner-date reminders not specified in reviewed partner documentation | Custom partner-date reminders not specified in reviewed partner documentation |
| Multiple partner profiles | Separate contact profiles with their own reminders and notes | Official help states one menstrual cycle at a time | Profile limit not specified in reviewed Clue Connect documentation |
| Basal body temperature (BBT) | Record BBT | Manual temperature logging outside Pregnancy mode | BBT charts with Clue Plus |
Cycle and fertile-window predictions are estimates. They do not confirm ovulation and must not be used as contraception. Feature availability can vary by subscription, version, platform and region. Comparison checked against official documentation in September 2026; an undocumented feature is not necessarily unavailable.
What makes Selin different from Flo and Clue?
Selin combines cycle tracking with profile-based planning for partners. Selin Partner Mode supports a Today cycle overview, separate contact profiles, notes and preferences, and reminders for doctor appointments, birthdays and custom dates. That combination can be useful when you want cycle information and everyday planning in one place. Flo offers Flo for Partners, with a view-only cycle calendar, tailored insights and optional couples quizzes. Clue offers Clue Connect, which shares cycle phases in a Calendar View without sharing mood, energy or pain logs. These are different approaches to partner support; they do not establish that one app is medically more accurate or more private. In Selin, reminder limits can depend on subscription, and availability can vary by app version and platform. Discuss what information your partner wants to share rather than treating a cycle estimate as a guide to their feelings or consent.
Privacy and your Selin account
Selin’s published privacy policy describes account-based storage of health data for synchronization, backup and optional partner features.
Account-based storage
Selin’s published privacy policy describes account-based storage of health data for synchronization, backup and optional partner features.
Read the policy
The app should not be described as storing all data only on your device.
Retention and deletion
Read the privacy policy for data use, sharing exceptions, retention and deletion options.
Respect for sensitive topics
Selin helps you understand your body and emotions without judgment or pressure —
only gentle guidance and support.
FAQ: Frequently asked questions about the Selin app
Check the current app or store listing for free features, subscription options and reminder limits. A paid plan should not be understood as a guarantee of more accurate cycle predictions.
Selin provides estimates based on your recorded cycle information. Actual period and ovulation dates can vary, particularly when cycles are irregular. A prediction does not confirm ovulation and should not be used as a reliable contraceptive method. No individual accuracy percentage is established here.
You can record irregular cycles in Selin and review your entries over time. Estimated dates may be less useful when cycle lengths vary. The app cannot identify the cause of an irregular cycle; discuss concerns with a qualified healthcare professional.
Selin can help you keep a record of period dates, symptoms and basal body temperature. Its estimated fertile window does not confirm ovulation or calculate your individual chance of pregnancy. Use it as a record to discuss with a healthcare professional.
Selin’s published privacy policy describes account-based storage of health data for synchronization, backup and optional partner features. The app should not be described as storing all data only on your device. Read the privacy policy for data use, sharing exceptions, retention and deletion options.
Selin supports dated reminders, including doctor appointments and custom events. Available reminder types and limits depend on your subscription and app version. A reminder does not replace instructions from your healthcare professional.
You can use a custom dated reminder for an errand such as buying pads or tampons. Check the reminder options and limits in your current app version.
Selin Partner Mode supports cycle information, separate profiles, notes and dated reminders. Record another person’s information only with their agreement. A cycle estimate cannot tell you how they feel or whether they consent to intimacy.
The implementation supports doctor appointments, birthdays and custom dated reminders for contact profiles. Reminder availability and limits can depend on subscription and app version. Use dates your partner chooses to share.
Partner Mode can help organize agreed cycle information and everyday plans. Ask your partner what support they want; do not infer their mood, needs or consent from a predicted cycle phase. No relationship outcome is guaranteed.
Cycle-related reminders depend on your settings and app version. Any displayed period or ovulation date is an estimate, not a confirmed biological event. Ask your partner what information they want you to record and use.
Selin combines profile-based partner planning, notes and dated reminders with cycle information. Flo for Partners provides calendar access and tailored insights; Clue Connect shares cycle phases. Compare the functions you need and each app’s privacy policy.
What is Selin?
Selin is a menstrual cycle app for recording periods, symptoms and mood. Its estimated cycle dates can help you organize your records; they are not a diagnosis.
Does Selin have Partner Mode?
Yes. Selin Partner Mode supports cycle overviews, contact profiles, notes and dated reminders. Available features and reminder limits can depend on subscription, version and platform.
Can Selin estimate ovulation?
Selin can show estimated ovulation and fertile-window dates based on recorded cycle information. Actual timing can vary, particularly with irregular cycles. Estimates do not confirm ovulation.
Can Selin be used as contraception?
No. Do not use Selin’s predictions to prevent pregnancy. The app does not replace contraceptive advice or care from a qualified healthcare professional.
