cyclotest Period Calendar App

In-app purchases
Content rating
Teen
50K+
Downloads
Content rating
Teen
Sexual Themes
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About this app

Cycle chaos? It doesn't have to be. With the free cyclotest app, you get a period calendar and cycle app in one: keep track of your period and cycle! Also suitable if you're trying to conceive.

Use the free cyclotest app as a cycle calendar & period tracker (Freemium)
• Track the start and intensity of your period!
• Get predictions for your ovulation phase and fertile days! (calendar method)
• Make notes about anything you notice during your cycle!
• Get reminders for your next period or when PMS is approaching!
• Plan ahead with the period calendar and stay prepared!

Quick sign-up, start right away
Download the cyclotest app for free and sign in with your Google Account. You'll be ready to make your first entries within seconds.

Premium (unlockable via subscription or lifetime code): use all features!
Taking out a subscription gets you a free month, letting you try all Premium features free of charge for a month.
• Track your basal temperature for a more precise calculation of your fertile days (temperature method per NFP)!
• Record additional body signals such as cervical mucus & LH tests!
• Log your mood (PMS etc.) & physical wellbeing!
• See the prediction for your next period, fertile phase, ovulation phase, and PMS phase at a glance!
• See which cycle phase you're currently in – and what's happening in your body!
• Discover recurring patterns: which symptoms typically occur in which cycle phase?
• Keep track of your past cycles and find out how regular your cycle is!
• Follow your temperature curve and all logged entries on the cycle chart
• Export your cycle chart for your next doctor's appointment!

For automatic data transfer: cyclotest mySense (Bluetooth basal thermometer)
Pair the cyclotest app with the cyclotest mySense basal thermometer: the Bluetooth thermometer automatically transfers your waking temperature straight into the app.
Note: Looking for "cyclotest mySense app"? → The cyclotest app is the right app for the cyclotest mySense basal thermometer.

Whether you're searching for a period calendar, cycle calendar, ovulation calendar, fertility calendar, or menstrual calendar – the cyclotest app is all of that.

The cyclotest app is ideal for women who:
• want to understand and get to know their cycle better.
• want to determine their fertile days and ovulation phase.
• rely on hormone-free methods of natural family planning (NFP).
• want to conceive naturally (trying to conceive).
• want to track early irregularities in early perimenopause or menopause.

Why trust cyclotest?
Trust doesn't happen overnight. It grows – with every cycle, every "aha" moment, every temperature curve. For more than 70 years, the cyclotest brand has stood for natural methods of cycle tracking (cycle tracker). The cyclotest app is a medical device. Developed and hosted in Germany.

Privacy
Your privacy matters to us. Your data is stored on a server in Germany.
Billing & management of your subscriptions is handled by Google – we don't receive any payment data (e.g. credit card details), only information such as purchase status & term, to correctly unlock Premium.

In-app purchases & subscriptions (Google)
Premium is available as an in-app purchase and is billed through your Google Play account.
Subscriptions renew automatically unless auto-renewal is cancelled at least 24 hours before the end of the current period. You can manage your subscription at any time in your smartphone's account settings and in your app profile.

Instructions for use & note
Please read the cyclotest app's instructions for use carefully before using the results.
Note: The cyclotest app is not a contraceptive. It is not approved for use as birth control.
Track your period, cycle and fertile days with cyclotest.
Updated on
Aug 26, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
  • This app may share these data types with third parties
    Location, App activity and 2 others
  • This app may collect these data types
    Personal info and Health and fitness
  • Data is encrypted in transit
  • You can request that data be deleted

What’s new

New scrollable calendar with colour-coded cycle phases
Revised onboarding and a new design for thermometer setup
Improved synchronisation and data transfer
Clearer temperature curve, daily chart and calendar
Many small improvements and bug fixes