Example: a Cycle Calendar entry in a normal calendar app

For Men Who Care

Cycle
Calendar

Her cycle, in your calendar.

Estimated cycle phases and a little daily context. In the calendar you already use.

Apple Calendar Google Calendar Outlook

Example in Apple Calendar

01 / After subscribing

How it looks in your calendar.

Cycle Calendar appears as its own subscribed calendar inside Apple Calendar, Google Calendar, or Outlook. You can show, hide, or remove it anytime.

Create calendar

Free. No account. No extra app.

—
28 days

Set this up with her agreement.

Phases are estimated from the dates, not measured. They do not predict her mood or identify ovulation.

When a new period starts, update the start date through a calendar entry. Keep the same subscription.

Today would be

Example using a 28-day cycle. No personal data has been entered.

Phase entriesExample
2026-10
2026-10-099
All-day
Team sync
Dinner
2026-10-1010
All-day
Team sync
Dinner
2026-10-1111
All-day
Team sync
Dinner

Each cycle phase shows as a calm all-day entry across the weeks.

Daily Page

Tap an entry: short context, body signs, and one small thing to notice today.

02 / The cycle

Four phases. Four rhythms.

Four cues for an approximate cycle rhythm. Timing and experience vary, even from one cycle to the next.

Regeneration

Menstruation · Days 1–5

Menstruation starts the cycle. Comfort and energy vary; rest is an option, not a rule.

Rise

Follicular · Days 6–12

Estrogen generally rises before ovulation. How this feels differs from person to person.

Peak

Ovulation · Days 13–16

An estimated window around ovulation. The calendar does not detect ovulation or predict desire.

Shift

Luteal · Days 17–28

The phase after ovulation. Changes can be noticeable or subtle; ask rather than assume.

Illustrative 28-day model, not measured phase timing.

03 / Born out of a need

More context. Fewer assumptions.

The calendar offers context. She tells you how she feels. Use the reminder to pay attention, not to explain her experience to her.

  1. Ask how she feels, rather than assuming.
  2. Offer to take a task off her hands.
  3. Make plans together, not from a forecast.
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FAQ

Good to know

Grounded in science.
What exactly do I get?

A private subscribed calendar that adds the four cycle phases as all-day entries — with a short daily note for each day. It appears as its own calendar inside Apple Calendar, Google Calendar, or Outlook. No app to install, no account to create, no sign-up of any kind.

Who is this for?

For men who want to understand her cycle and be more attentive in everyday life.

Which calendars work?

Any calendar that supports ICS/WebCal: Google Calendar, Apple Calendar, Outlook, and most others.

What if the cycle shifts?

When a new period starts, use the update link in a calendar entry to enter the new start date. The subscription stays the same. Your calendar app fetches the changes on its own schedule.

How accurate is this?

This is a date-based estimate, not a measurement of hormones, mood or ovulation. Cycles vary. The simple natural-cycle model may not fit irregular cycles or hormonal contraception.

Is this a fertility tracker?

No. It's an orientation tool — designed for awareness, not for conception planning or contraception.

What about privacy?

No account is required. Cycle and operational data are stored on the server. There are aggregate counts and server logs, but no advertising profiles. The private link grants access; see Privacy for details.

Privacy

Privacy

Privacy
  • No account or email address is required to create a calendar.
  • The server stores cycle dates, language, hemisphere and the operational data needed to provide the feed.
  • No advertising trackers. Small aggregate usage counts and operational logs are kept.
  • We do not have access to your other personal calendar events.
  • Keep the link private. Anyone with it, including your chosen calendar provider, can access the feed.

For Men Who Care

Her cycle, in your calendar.

Free. No account. No extra app.

Create calendar

Privacy

Last updated: 9 October 2026

Calendar data

Creating a calendar stores the period start date, cycle length, selected language and hemisphere inferred from the device time zone. The time zone itself is not stored in the feed record. Link lookup references, status, versions and activity timestamps support delivery and maintenance. No name or email is required for this.

Private links and calendar providers

Anyone with your private link can read the feed and access its update controls. Treat it like a credential, not a public link. Your calendar app or provider fetches the feed and receives its dates and content. We do not read your other calendar events.

Usage counts and logs

Small totals record page languages, page views, feed requests and daily-page views. These analytics totals do not retain an IP address or create a personal advertising profile. Separate operational logs may contain IP addresses and request times. Current access logging redacts private calendar links; older logs can retain earlier URLs until rotated.

Feedback and email

Feedback stores your message, language, submission time and basic page context. A reply email is optional and is stored if supplied. Feedback notifications are sent through an email provider. The feedback form uses a session cookie; no account is needed for the calendar.

Infrastructure and external services

The website and calendar server are hosted in Germany. Hosting, email delivery and backup storage involve infrastructure providers. Some pages load Fraunces, Inter Tight and JetBrains Mono from Google Fonts, which can expose the visitor's IP address to Google. We do not promise that no data ever reaches a third party.

Stopping and deleting

Removing the subscription from your app does not delete the server record. The update page also offers calendar deactivation, which stops delivery. Operational records and older backup copies may remain until their retention or rotation ends. Contact hello@cyclecalendar.cc with the private link for a server-side deletion request.

Your rights and contact

For access, correction, erasure, restriction, portability or objection requests under applicable data-protection law, contact hello@cyclecalendar.cc. You can also complain to the competent supervisory authority.

Responsible party

Lutz Haase, Danziger Straße 215, 10407 Berlin, Germany. Contact: hello@cyclecalendar.cc.

Changes

This page describes the website and calendar service. Material changes will be reflected here. Calendar users do not have a required contact email, so there is no general email-notification list.

Sources

The biological background draws on research. Calendar phases are estimates and daily notes are prompts, not individual forecasts or medical advice.

npj Digital Medicine

Large cycle datasets show variation in cycle and phase lengths. They do not validate a mood forecast for an individual.

Real-world menstrual cycle characteristics of 600,000+ cycles · Bull et al., 2019

Endotext / NIH

Background on the physiology of the menstrual cycle, not a validation of Cycle Calendar.

The Normal Menstrual Cycle and Control of Ovulation · Reed & Carr, 2018

Psychoneuroendocrinology

Methods for studying the cycle and distinguishing estimated timing from measured evidence.

How to study the menstrual cycle: tools & recommendations · Schmalenberger et al., 2021

Daily Page Example