One Big Calendar: Period

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.