Period & Cycle Diary: Private
No sign-up, no ads, app lock
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Log your cycle dates in a few taps. After 3 cycles, see a rough estimate for the next. Everything stays on your device, with a lock for privacy and export when needed.
A period and cycle diary that asks nothing of you first - no account, no sign-up, no ads.
- One tap to record
Log when your period starts and ends, how heavy it is, and how you're feeling, from a simple calendar.
- A next-period estimate, shown as a range
Once you've recorded 3 cycles, the app shows an estimated range for your next period, calculated from your own past cycles - never a single date presented as certain.
- Calendar that tells recorded days from estimated days apart
Recorded days and the estimated range are always shown differently, so you never mistake one for the other.
- A private space to reflect
See your cycle length over time and how much it varies. Free shows your most recent 6 cycles; a one-time purchase unlocks your full history.
Free forever: recording, calendar, the next-period estimate, app lock, export/import, and reminders. A one-time purchase unlocks unlimited custom tags and your full cycle history.
- Completely private
No account, no ads, no tracking, no internet connection required. Nothing you record is ever sent anywhere - it all stays on this device. Add an app lock (Face ID/passcode) for extra privacy.
Available in 9 languages: English, Japanese, German, French, Spanish, Korean, Traditional Chinese, Vietnamese and Portuguese.
This app is not for contraception, and does not tell you if or when you can get pregnant. If you have symptoms that concern you, please talk to a doctor.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
New: see which feelings you log most, and on which weekdays.
New: a one-tap “Same as yesterday” when recording a day.
The developer, AKIHIRO MATSUYAMA, 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 Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- AKIHIRO MATSUYAMA
- Size
- 31.9 MB
- Category
- Lifestyle
- 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 8 more
- English, French, German, Japanese, Korean, Portuguese, Spanish, Traditional Chinese, Vietnamese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Period & Cycle Unlock $1.99
- Copyright
- © 2026 松山明寛