DuoPhase

Your cycle, private. Your needs, heard.

DuoPhase is a cycle tracker that stays yours, with one simple way to tell your partner what would help today. Nothing is shared until you turn it on.

A woman resting with a warm drink in the morning light

A tracker that is yours

Log a period as ended, ongoing or with the end unknown. Add flow, symptoms, moods and a private note for any day. Your calendar shows recorded days and estimates differently, so a guess never looks like a fact.

It works fully on its own. A partner is optional.

October 2026

Filled days are recorded. Dashed days are an estimate.

Selected date

Saturday, October 17

Nothing logged for this date

Edit day

A check-in in a minute

How much energy you have, how stressed you feel and how much room you have to connect. Three quick answers, with a private note if you want one.

Your note is stored encrypted and is never shown to your partner.

How are you today?
Energy

62% Good

Stress

3/10 A little

Room to connect
LowSomeOpen
Private note
Long day, early night.

Ask, and choose what he sees

Tell your partner what would help right now and for how long. You can do that with every cycle switch off: a request needs no cycle information at all.

The preview always shows exactly what your partner sees now, from your saved choices.

Privacy & connection
Share a broad cycle phaseNo dates or cycle day
Share calendar timingCurrent period and next estimate
Your partner sees now

Nothing from your cycle. Both choices are off.

Always private

Cycle day, past periods, symptoms, moods, notes and tracking counts.

See how he is, too

When he shares his check-in, you see his battery, what is on his mind and what would help him, in his own answers.

DuoPhase says what he shared, not why he feels it. And he can ask you for things the same way.

What Alex shared today
Alex today

Low battery

He shared that his energy is low today.

What never leaves your tracker

Your history

Past periods, cycle day and tracking counts are never shared, whatever you switch on.

Your days

Symptoms, moods and flow stay private. So do your notes, which are stored encrypted.

Your lock screen

Notifications never name a period, phase, mood or fertility.

Your choice to stop

Turning a switch off removes it from his view right away. It cannot undo what he already saw.

Start your private tracker.

Invite your partner whenever you are ready, or never. It works either way.