1. No account. Open it and start.
There is no sign-up and no long welcome tour. Pick a goal mode — tracking, trying to conceive, pregnancy or perimenopause — then enter the first day of your last period and roughly how long your cycle runs. Rough numbers are fine; predictions adjust as your record grows.
2. Honest predictions.
Your next period is given as a date range with a confidence level and the reason behind it, instead of a single made-up day. When cycles are irregular the range widens and says so — drawing the uncertainty honestly is more useful than pretending to be exact.
3. Your month at a glance.
Period, fertile window and estimated ovulation are marked on the calendar. Tap any day to fill in one you missed, and see what is coming before it arrives.
4. Log a day in seconds.
Flow, symptoms and their severity, mood, energy, basal body temperature, cervical mucus, ovulation tests, pregnancy tests, intimacy, therapy check-ins and notes. The log sheet only shows the fields you turn on; anything you would rather not track can stay blank.
5. Patterns from your record.
Stats for your last three cycles are free. Yimaji Pro unlocks your whole history and per-cycle stats, plus insights by cycle phase, symptoms that occur together, what changed against your earlier record and therapy check-ins.
6. Log from your wrist, Home Screen or voice.
Small, medium and large Home Screen widgets and Lock Screen accessories get you into the log in one tap. On Pro the large widget can start today's period directly; the Apple Watch app with four complications lets you view and log from your wrist; Siri and Shortcuts can start a period or answer "when is my next period".
7. Encrypted backup, safe across phones.
Export your record as an encrypted .ymbk backup. The passphrase is yours; Yimaji neither stores nor recovers it. Restore the file on a new phone to bring everything back, and use CSV export when you want to analyse the data yourself or hand it to a doctor.
8. Private by design.
Records stay on this device and are written to Apple Health only when you turn that on. Yimaji has no account system, no server, no advertising and no third-party analytics, and your records are never uploaded to us. The only network communication is Apple's in-app purchase (buying, restoring or starting the trial), which Apple handles — we never receive your payment details. App lock uses iOS Face ID or your device passcode; Yimaji never touches biometric data.
Yimaji provides estimates, not medical advice, and is not a method of contraception. If you have heavy bleeding, severe pain or fainting, seek medical care right away.
Free to download: logging, the calendar, predictions and stats for your last three cycles, plus every privacy feature, two-way Apple Health sync, encrypted backup and restore, CSV export, widgets and a visit summary covering the last six cycles are free forever — you can keep using them without buying Pro. Yimaji Pro is a single one-time purchase that never expires and never renews, and you can try it free for three months: the trial is a $0 non-consumable product, not a subscription, so nothing is charged at the start, during it, or when it ends.
Log / predict / insights / reports, covering the cycle from today to your next appointment.
Goal mode: tracking, trying to conceive, pregnancy or perimenopause, changeable in Settings at any time.
Before a check-up: the free version builds a visit summary for the last six cycles; Pro lets you choose the range and sections for a multi-page PDF.
Languages: 10 interface languages following your system setting (English, 简体中文, 繁體中文, 日本語, 한국어, Español, Français, Deutsch, Português (Brasil), العربية) — nothing to configure inside the app.
Appearance: light or dark, following the system; Arabic switches the layout to right-to-left.
Requirements: iPhone and iPad, iOS 18 or later; the Apple Watch app and complications need watchOS 11 or later.
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Usage notes and FAQ: Yimaji support
Privacy policy: Yimaji privacy policy
Email: zhsoft88@icloud.com