Quiet Moon · A private cycle planner
A calm month, in the sky you like.
Plan around your cycle on one ring, in five hand-painted themes. Everything stays in an encrypted file on your phone.
Try one. The whole page follows, the way the app does.
Tuesday · Day 9
After the period.
Period in about 20 days.
Lisbon is on the 24th, before it.
Plan
See where a trip lands before you book it.
Pins on the ring, and a plain note when a plan falls on likely period days.
Learn
Predictions that admit what they don’t know.
Dotted for three cycles. After that, a window with a soft edge, wider if your cycles vary.
Keep
Nothing to sign up for.
No account, no server, no ads. A PIN, and an export only you can open. How it’s kept
Make it yours
A lock screen that follows your cycle.
Turn on the lock screen sky and your wallpaper changes a little each day: a thin moon, a half, a full one, and back again. No words and no numbers. Only you know what it means.
- Five skies
- Dial styles
- Your own trackers
Built for planning, not only logging.
Four screens from the app, as they are.

Find a good time
Say how long. It shows the stretches clear of your period and of your own low-energy days.

Check a date
Select a date in any other app, choose Quiet Moon, and see how it sits in your cycle.

Your year
Every day as a dot, every cycle as a ring. Save it as a picture with no words on it.

Where things land
Pick something you log. See which days of the cycle it turns up on.
These, and the lock screen sky, are part of Everything, once. The lock screen sky and Check a date are for Android.
Four weathers.
Each phase has its own small picture, the same in every theme. The guide says what the phase is and roughly when. It never tells you how you should feel.
Days 1–5 or so
Period
A new cycle starts on the first day of real flow.
Days 6–12 or so
After the period
The part of the cycle that varies most in length.
Days 13–15 or so
Around ovulation
Estimated from your cycle length. An estimate, not a test.
The last two weeks
Before the next period
From ovulation to the next period, usually about two weeks.
Free to keep. €4.99 once for the rest.
Free, always
€0
Nobody should pay to be left alone, or to take their history with them. In 23 languages.
- Log in three taps or one line (“cramps, tired, slept badly”), with a pain map
- The Moon dial and honest predictions, for regular, irregular, after the pill or perimenopause, with a pause when life needs one
- Gentle reminders and check-ins that say nothing on the lock screen
- PIN, second PIN, fingerprint
- Encrypted export and import (from Clue, Drip, Flo and others), and a one-page summary for an appointment
Everything, once
€4.99
One payment, kept by your store account. No subscription, ever. No ads, ever.
- Plan around your cycle: find a good time, plan A or B, your phone calendar on the month, check any date from another app
- Learn from your own logs: week ahead, what helped, “It passes”, cycle recap
- Look back: where things land, try it for three cycles, your year as one picture
- Make it yours: your own trackers, every sky, dial styles, a lock screen sky that follows your cycle
- A second moon: a second person on the same phone, with their own PIN