Simpluna Period Calendar

Over 600,000 downloads!

Simpluna is a simple period tracker and menstrual cycle tracker for recording period dates and checking your next period prediction.

Open the period calendar, tap the start or end date, and your next period is shown on the calendar.

Predictions shown in the app are estimates based on your records.

They are not intended for medical diagnosis or treatment, or for decisions about contraception or pregnancy.

It is a period journal for the basics done well: no ads, no articles, no AI chat, no forums, no fluff.

Your data stays on your device — no account required.

Simpluna Plus is a one-time purchase, not a subscription.

Track and predict your cycle. Nothing else.

—————— Features ——————

Simpluna is an app for recording and predicting your period days.

When you launch the app, a calendar appears so you can check your next predicted period and past periods at a glance. By cutting unnecessary features and keeping things as simple as possible, we make sure the app does not get in the way of your daily life.

▶ Easy recording

To record your period, just tap a date on the calendar and press the start or end button. It is intuitive, so there is nothing new to learn.

▶ Notes on each day

If there is anything you want to keep track of, such as how you feel or your physical condition, you can leave it as a note.

▶ Notification before the predicted date

You can receive a notification as your next predicted period approaches. You can specify how many days in advance and at what time you want to be notified.

▶ Register up to 1 year of past data

If you have past period records, you can register them. The available range goes back up to 1 year from when you started using the app. (With Simpluna Plus, you can register up to 10 years.)

▶ Forecast calendar up to 1 year ahead

The forecast calendar lets you look up to 1 year into the future. You can also save future plans as notes and view them together with the predictions.

▶ List of past periods

You can review your past periods as a list.

▶ App lock

You can lock the app with a 4-digit passcode if you do not want others to see it. Face ID is also supported.

▶ Dark mode support

The UI colors automatically switch to match light or dark mode.

▶ Works offline

You can keep using the app even when offline or with a poor signal.

—————— Simpluna Plus (Paid: one-time purchase) ——————

▶ Color themes

16 colors are available.

▶ Ovulation tracking

Predict and manage ovulation, including the window around it.

▶ PMS period display

The PMS period is shown as an underline on the calendar. You can change the number of days for the period.

▶ Pause

Pause predictions during pregnancy, treatment, or other times.

▶ Prediction summary

Show your current cycle day, next period, and ovulation prediction on the home screen.

▶ Customizable input fields

Add custom fields such as symptoms, flow, temperature, or medication.

▶ Customizable notifications

You can freely change the timing and message of notifications.

▶ Pill reminder

Set daily pill reminders, active periods, break periods, and the message.

▶ Widget

Show your next predicted period as a home screen widget.

▶ Past data registration (up to 10 years)

You can register data going back up to 10 years from the day you started using the app.

▶ Health app integration

Auto-sync period dates, import from the Health app, and export.

A 24-hour trial is available before purchase (you will not be charged automatically).

—————— Other one-time purchases ——————

▶ Continuous cloud backup

Continuous cloud backup with a one-time purchase. No monthly or annual fees. Migration and manual backups are free.

▶ Data sharing

Share records and predictions with someone you choose. Includes data backup.

—————— Supported OS ——————

iOS 16.4 or later is required.

Some older iOS versions may not be able to install future updates.