Period Calendar Cycle Tracker

Period Calendar Cycle Tracker is a private period tracker and menstrual calendar for real cycles, including irregular ones. Log your period in one tap, see when the next one is likely to start as an honest range, and keep a record you can share with your doctor. No account. Your cycle log stays on your phone.

Most period calendars show one confident date, and when your cycles vary it is wrong every month. This cycle tracker shows the range your own cycles actually cover: the earliest and the latest day your next period is likely to start, based on your last six cycles. The more you log, the tighter it gets.

WHAT YOU CAN DO
• Log a period in one tap: "Period started", then "Period ended". Forgot? Pick any past day.
• See your cycle at a glance: a cycle ring shows the day of your cycle and your next-period range.
• Period calendar: logged days, your predicted range and the days you noted, month by month.
• Log flow, pain, symptoms and mood in a few taps: cramps, headache, back pain, bloating, breast tenderness, acne, fatigue, nausea, cravings, trouble sleeping, hot flashes, mood swings.
• Insights: average cycle and period length, how much your cycles vary, a chart of your last 12 cycles and your most frequent symptoms.
• A period log for doctor visits: a PDF and a CSV file, shared from your phone when you choose.
• Discreet reminders: a heads-up before your range starts and an optional daily log reminder. By default the notification says only "Time to check in".

BUILT FOR IRREGULAR CYCLES
A PCOS period tracker and a perimenopause period log in one. If you have PCOS, are in perimenopause, have just stopped the pill, or your cycles simply vary, a single predicted date does not help. The range does: a period tracker for irregular cycles that tells you "your cycles vary by 9 days" instead of pretending they don't. Cycles after a long logging gap are kept in your history and left out of the estimate.

PRIVATE BY DESIGN
• A period tracker: no account, no sign-up, no cloud. Your period log is stored only on this phone.
• Works as an offline period tracker: nothing you log needs the internet.
• App lock with a PIN or your fingerprint.
• Hide the app's content in the recent apps screen.
• Back up to a file you keep, restore it on a new phone.
• Erase all data with one button.
The app shows ads. Your cycle data is never sent to ad networks or analytics.

NOTHING LOCKED
Every logging feature is included: calendar, range, symptoms, reminders, insights and the PDF for your doctor. Longer PDF reports can be unlocked by watching a short video.

Predictions are estimates based on what you log. Period Calendar Cycle Tracker is not a medical device, does not diagnose any condition and must not be used as contraception. Talk to your doctor about any change in your cycle.

Recent changes:
First release: one-tap period log, an honest next-period range, symptoms, insights, a PDF for your doctor, discreet reminders and an app lock.