One Big Calendar
See your period and your work calendar on one screen
One Big Calendar puts your calendar events and your menstrual cycle on a single grid, so you do not have to switch apps. iCloud, Google and Outlook events sit next to your period, phases, moon and symptoms.
It is for people who live out of a calendar and want to plan travel, meetings or deep work around their phases, including people with ADHD who want one screen for everything.
How One Big Calendar does it
- Connect your existing calendars, work and personal.
- Log your period days, and see your phases and next-period prediction on the grid.
- Turn on two-way Apple Health sync, if you want your existing period logs to appear.
- Add symptoms, mood, intimacy or weight with one-tap logs.
- Toggle cosmic overlays such as moon phases, retrogrades and eclipses, and read the Focus Today card.
Questions
Which calendars can I use?
iCloud, Google, Outlook and Fastmail all appear on the same grid.
Who can see my cycle data?
Everything stays on your device or in your own iCloud, with no ads, no trackers and no data sold.
Can it be used as birth control?
No. It is not a contraceptive. It is for planning and tracking only.
Not medical advice. One Big Calendar is not a medical device, a contraceptive, or a substitute for professional care. Consult a healthcare professional for medical decisions.