My Period Calendar

OuiApps

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About this app

Most period apps hand you one date and ask you to trust it. This one shows you the range and keeps the whole thing on your phone.

My Period Calendar is a private, offline period tracker and menstrual calendar. Period prediction comes from your own history rather than an average, it tells you how sure it is, and it never sends anything anywhere. No account. No cloud. No banner ads. No analytics.


KNOW WHAT'S COMING
- Your next period with an honest range and a confidence level, instead of a single date pretending to be certain
- A cycle ring that shows where today sits in the whole month — cycle day, cycle phase, days to go
- One tap to mark your period started or ended; every estimate recalculates from what actually happened
- Made for irregular cycles: edit past dates, leave out an unusual month, and the prediction adapts


YOUR DAY IN ABOUT A MINUTE
- Log flow, mood, energy, pain and symptoms in one short check-in
- A full symptom library — cramps, headaches, bloating, fatigue, sleep, skin, digestion — plus symptoms you add yourself
- Notes, water, weight, temperature, and reminders for medication or birth control


SEE YOUR OWN PATTERNS
- A personal baseline built from your recent cycles, so you are compared with yourself and not with an average
- Week Ahead: what tended to happen on the same cycle days in the months before — the PMS pattern you keep half-noticing, finally visible
- Symptom frequency, correlations and cycle history you can actually read


FERTILITY AWARENESS, WITHOUT THE OVERPROMISE
- Estimated fertile window and estimated ovulation day, calculated from your cycle history
- Log basal body temperature and cervical mucus as your own evidence, kept separate from the calendar estimate
- Timing is shown as Low, Rising, High or Peak — never as a probability of pregnancy
- Please read this clearly: it is an estimate. It is not contraception, and it does not confirm ovulation.


PRIVATE BY ARCHITECTURE, NOT BY PROMISE
- Everything stays in local storage on your device
- Optional PIN lock with encryption at rest
- Encrypted backup you control, plus a plain JSON export you can read
- A PDF summary you can print or bring to an appointment
- The app has no network permission to reach a server, so there is nothing to leak


FOR WHATEVER STAGE YOU ARE IN
- Use it as a simple period tracker or as a full cycle tracker: trying to conceive, perimenopause, pregnancy and postpartum , all optional, all private journals
- A partner summary that shares timing and phase, and leaves your notes, symptom details and medication names out of it

TEN LANGUAGES, ALL OFFLINE
English, Spanish, French, German, Portuguese, Italian, Romanian, Arabic, Hindi and Simplified Chinese are built in — not fetched, not translated by a service. Light and dark themes, high contrast, reduced motion and large touch targets.

WHAT THIS APP WILL NOT DO
It will not diagnose you. It will not call a day safe. It will not claim a precision it cannot support. When your body does something unusual, it says so plainly and suggests you talk to a clinician, it does not try to explain it away.

Install it, log a single day, and see where you are in your cycle. There is nothing to sign up for and nothing to cancel.