ふたより

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About this app

Futayori is a fertility app that predicts fertile periods based on menstrual cycle records and cycle settings, and allows you to share this information with your partner.

It reduces the burden of checking and explaining fertile periods alone each month. It makes it easier for both partners to review predictions and coordinate plans for conception.

You can record your basal body temperature and physical condition to review your cycle. The app uses menstrual cycle records and cycle settings to predict fertile periods; it does not have a function to pinpoint ovulation dates from basal body temperature.

You can record data on this device without registering. You can create an account and invite your partner when you want to share. You can choose what to share from cycle settings, menstrual cycle records, basal body temperature, physical condition records, and date memos. Initially, everything is only shared with you.

What you can do:

* Display fertile periods and estimated ovulation dates based on menstrual cycle records and cycle settings.
* Record menstrual dates and check cycles.
* Record basal body temperature and physical condition.
* Check schedules and notes on the calendar.
* Partner integration allows you to choose the types of records to share.
* Back up to the cloud and use on other devices.
* Download records as a CSV file.
* Delete records and accounts.

Important Notice:

The fertile periods and ovulation dates are estimates calculated from menstrual cycle records and cycle settings. Cycles vary from person to person and may differ from actual dates. Pregnancy and ovulation are not determined from basal body temperature or physical condition. Do not use this for contraception or to decide whether to see a doctor. Futayori is not a medical service that provides diagnosis or treatment. If you have any concerning symptoms, please consult a medical institution.
This fertility app predicts and shares fertile periods based on your menstrual cycle, and also allows you to record basal body temperature and your overall health.
Updated on
Sep 3, 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.
  • No data shared with third parties
    Learn more about how developers declare sharing
  • This app may collect these data types
    Location, Personal info and 4 others
  • Data is encrypted in transit
  • You can request that data be deleted

What’s new

キャラクターアイコンに変更しました。画面表示と起動パフォーマンスを改善し、タブレットや折りたたみ端末での表示に対応しました。
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Everyone
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App support

About the developer
RASIDE
info@raside.com
1-12-16-202, KOMATSUMINAMIMACHI NISHINOMIYA, 兵庫県 663-8124 Japan
+81 90-3655-5305