One Big Calendar: Period

Cycle Tracker & Daily Planner

Free · In‑App Purchases

The only calendar that also knows your body's week. One Big Calendar puts your work and your cycle on a single screen. iCloud, Google, and Outlook events sit right next to your period, phases, moon, and symptoms — so you can see how your week and your body line up, and plan accordingly. WHY IT'S DIFFERENT Most calendars ignore your cycle. Most cycle apps ignore your calendar. OBC does both. Your Monday standup and your ovulation window are on the same grid. Your Friday deep-work block and your PMS forecast are on the same grid. Nothing to context-switch between. WHAT'S ON YOUR GRID - All your existing calendars (iCloud, Google, Outlook, Fastmail, work + personal) - Your menstrual cycle: period days, phases (menstrual, follicular, ovulation, luteal), next-period prediction - Cosmic overlays you can toggle: moon phases, planetary retrogrades with shadow windows, solstices and equinoxes, eclipses, zodiac seasons - Symptoms, mood, intimacy, weight — one-tap logs - Focus Today card: what your day looks like on this phase PRIVATE - Everything stays on your device or in your own iCloud - No ads, no trackers, no data sold to anyone - Optional Apple Health sync — two-way, so your existing period logs show up here and the ones you add here go back to Health - Anonymous feedback only — we never see who you are FOR PEOPLE WHO - Live out of a calendar and are tired of guessing where in their cycle they are - Want to plan travel, meetings, or deep work around their phases without a separate app - Care about cosmic overlays (moon, retrograde, eclipses) but don't want a full astrology app - Have ADHD and need one screen for everything, not five NOT MEDICAL ADVICE For planning and tracking only. Not a medical device, not a contraceptive, not a substitute for professional care. Consult a healthcare professional for medical decisions. TERMS & PRIVACY Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://hellogoodday.com/onebigcalendar/privacy Subscriptions auto-renew at the price shown unless cancelled at least 24 hours before the current period ends. Manage or cancel any time in Apple Account Settings.

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• Pro: Patterns is here. See every symptom lined up by cycle day, one row per cycle, and tap any symptom for when it usually shows up, how often, and in which phase. • Predictions keep up when a period goes unlogged. Once it's due, it shows as expected any day. If it stays unlogged, the app estimates the next one for you. Log the real date, even an earlier one, and everything updates. • Clearer first steps: Patterns and your cycle screen show what to log to get started. • Fix: the welcome message no longer covers the tab bar.

The developer, Hello Good Day LLC, 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 Linked to You

    The following data may be collected but it is not linked to your identity:

    • Purchases
    • User Content
    • Identifiers
    • Usage Data
    • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More

The developer has not yet indicated which accessibility features this app supports. Learn More

Seller
Hello Good Day LLC
Size
5.5 MB
Category
Health & Fitness
Compatibility
Requires iOS 17.0 or later.
  • iPhone
    Requires iOS 17.0 or later.
  • iPad
    Requires iPadOS 17.0 or later.
  • Mac
    Requires macOS 14.0 or later.
  • Apple Vision
    Requires visionOS 1.0 or later.
Languages
English and 10 more
  • English, Dutch, French, German, Italian, Japanese, Korean, Portuguese, Russian, Simplified Chinese, Spanish
Age Rating
13+
  • 13+
  • Infrequent
    Medical Treatment information
    Sexual Content or Nudity

    Contains
    Health or Wellness Topics
In-App Purchases
Yes
  • Pro Lifetime $49.99
  • Pro Yearly $19.99
  • Pro Monthly $2.99
Copyright
© Hello Good Day LLC