Function · Period Tracker
Period Tracker: Your cycle at a glance
Log your period, see phases, see your next period coming – the calendar in the Bauchgefühl app does the math for you instead of making you count.
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In the calendar
What you see in the period calendar
Log period in two taps
All 4 phases color-coded in the calendar
Next period prediction
Fertile days, honestly estimated
Spotting and symptoms directly on the day
Honest comparison
Period calendar on paper vs. app
Many people look for a "printable period calendar" – and that's not a bad idea: a paper calendar costs nothing, doesn't need a battery, and no one can access it except you. If you just want to record, when your period was, it is completely sufficient.
Its limit: Paper doesn't calculate. Predicting the next period, estimating fertile days, connecting symptoms into patterns over months – you have to do all of that yourself on paper, every cycle anew. An app takes exactly this work off your hands.
Record
Paper: Checking boxes – works
App: Two taps – works on the go too
Next period
Paper: Count and calculate yourself
App: Predicted from your cycles
Fertile days
Paper: Rule of thumb in your head, prone to error
App: Automatically estimated (±2 days)
Patterns over months
Paper: Only visible with a lot of discipline
App: Symptom points and trends show them to you
Spotting
Paper: Easily blurred with your period
App: Custom marker, does not affect the prediction
Reminder
Paper: None
App: Reminds you before your period arrives
Fair is fair: If you want to track offline intentionally, you can't go wrong with paper. You can read about how Bauchgefühl protects your data if you choose the app under Data protection in the cycle app.
Thinking ahead
The calendar is just the beginning
Once you know which phase you are in, you can work with it: Bauchgefühl shows you what is happening in your body during each phase and suggests recipes that fit – such as magnesium-rich dishes in the luteal phase when cravings kick in. We explain what defines the four phases under The 4 cycle phases explained simply.
If you are trying to conceive, it is worth taking a closer look at the fertile window – our Ovulation calculator estimates it for you directly in the browser. And what belongs on your plate in the days before your period can be found in What to eat during your period?. An overview of everything else the app can do is provided on the page Cycle app at a glance.
FAQ
Frequently asked questions about the period calendar
How accurate is the period prediction?
The prediction is based on your logged cycles: The more periods you document, the better the app knows your personal pattern. With a reasonably regular cycle, the estimate for the next period is usually accurate within a few days; fertile days are estimated with an uncertainty of about ±2 days. A prediction is not a guarantee – stress, illness, or travel can shift any cycle.
What if my cycle is irregular?
Then a calendar that calculates along with you is even more useful – you can see over several cycles how much your cycle length actually fluctuates, instead of just guessing. The prediction becomes correspondingly less certain with strong fluctuations; take it as a guide, not a fixed date. If your cycle is permanently shorter than 21 or longer than 35 days, this should be discussed in a gynecological practice.
Does spotting count as a period?
No. Spotting is not menstruation – that's why you enter it separately in Bauchgefühl. It is marked specifically in the calendar and is not included in the calculation of your cycle length. This way, a spotting day before your period does not distort your prediction.
Can I log past periods?
Yes. You can enter periods retroactively and correct entries – the prediction then automatically recalculates. This is especially worthwhile at the beginning: log your last two or three periods, and the app will start directly with a useful estimate instead of average values.
Does the period calendar replace contraception?
No, explicitly not. The fertile days in the calendar are an estimate based on your previous cycles – ovulation can shift by days at any time, and sperm survive for up to five days. If you want reliable contraception, talk to your gynecologist about suitable methods.
Is the calendar also available as a widget?
On the iPhone, yes: The Bauchgefühl widget shows you the cycle day and current phase directly on the home screen – without opening the app. For a quick check in the morning, a glance at your phone is enough.
No more counting: The calendar does the math for you
Enter your last period – from then on, Bauchgefühl tells you which phase it is today and when your next period is coming. Try for free for 7 days, cancel at any time.
Note: This page is for general information purposes and does not replace medical advice. Predictions in the period calendar are estimates based on your recorded cycles and are explicitly not a method for contraception or family planning.