Stop forcing it. Know exactly when to act, and when to rest.
Every morning, 28 Signal gives you a clear cue, tuned to the real lunar cycle: today you move forward, or today you rest. Without the guilt.
iOS · Android · no card required
13 lunar months
set on the real position of the Moon
0 · 1 · 2 · 3 · 5 · 8 · 13 · 21
the Fibonacci sequence powers each day
Your Vitruvian Number
derived from your birth date, from 4 to 12
The to-do list. The tiredness. The guilt of easing off.
What if the problem wasn't you?
It's the rhythm you're following.
Fibonacci sequence and lunar cycle: the source code of living things behind your 28 days.
Three layers of calculation, one reading: your exact position in the cycle, every morning.
01
The Moon, for real
A 13-month lunar calendar set on the real astronomical position of the Moon, not an approximation. The year begins at the second new moon after the December solstice.
02
The Fibonacci signals
In 1202, Fibonacci described the sequence that structures the growth of living things. Days 0, 1, 2, 3, 5, 8, 13 and 21 of the cycle carry a signal, from Operational mode to Apogee, P0 to P5.
03
Your Vitruvian Number
Derived from your birth date, always between 4 and 12, it reveals the day of the cycle when energy converges toward you. That day, the signal is personal.
This isn't astrology. It's geometry applied to time.
Every morning. A verb. A power. A phrase.
The signal of day 12 of month 4 looks like this:
"Give your foundation a body: sign, commit the means, anchor it in the real."
The lunar compass is free. The phrase that sets the course is for subscribers.
Your daily compass, without the mental load.
One signal. Not a feed.
Every morning, a verb, a power, a phrase. No anxiety-inducing notifications. No algorithm demanding your attention. Just your position in the cycle.
The off-day, finally made legitimate.
28 Signal also tells you the exact day when stopping is your most powerful act. No guilt. Just a signal.
Free to start, precise to move forward.
The full lunar calendar is free, forever. Premium unlocks the key phrase, your Vitruvian message, notifications at dawn, and the widgets.
You see the calendar.
Not yet the message.
Free
forever
- ✓Full lunar calendar
- ✓Day numbers (Month : Day)
- ✓Basic signal of the day
- –Each signal's key phrase
- –Your Vitruvian day message
- –Daily notifications
Premium
€11.88 · i.e. €0.83 / month · 2 months free
- ✓Everything in Free
- ✓Each signal's key phrase
- ✓Your Vitruvian day message
- ✓Notifications at dawn
- ✓iOS & Android widgets
Cancel anytime · Secure payment · Monthly available at €0.99 / month
Frequently asked questions
Everything you want to know before tuning your days to the Moon.
What is 28 Signal?
A daily guidance app: every morning, a clear signal (a verb, a power, a phrase) set on the real position of the Moon. It tells you whether the day is made for moving forward or for resting.
Is the app free?
Yes, free and forever for the full lunar calendar, the day numbers and the basic signal. The Premium subscription (€9.99 / year) unlocks each signal's key phrase, your Vitruvian day message, notifications at dawn and widgets.
What is the Vitruvian Number?
A number derived from your birth date, always between 4 and 12. It reveals the day of the cycle when the signal becomes personal.
Is it astrology?
No. No zodiac signs or birth chart. 28 Signal crosses the real astronomical position of the Moon with the Fibonacci sequence, two mathematical, verifiable systems. A marker of rhythm, not a prediction.
What is the off-day?
The day of the lunar cycle when 28 Signal tells you that stopping is your most powerful act. Not a wasted day: a day to recharge, anchored in the logic of the cycle, where forcing would be counterproductive.
Can I cancel anytime?
Yes. The Premium subscription can be cancelled at any time, payment is secure, and a monthly plan at €0.99 / month is also available.
Fatigue, doubt, uncertainty:
your lunar signal awaits you every morning.
Your signal awaits you tomorrow morning.
Free to start · No card required
Lunar calendar, lunar cycle and daily signal: the 28 Signal method
What if your exhaustion wasn't a lack of willpower, but a disagreement with your natural rhythm? Every morning, 28 Signal crosses the real position of the Moon with the Fibonacci sequence (an eight-century-old logic) to deliver a precise signal. Not a horoscope: a marker anchored in the lunar cycle, designed to ease your mental load.
A 13-month lunar calendar set on the Moon's phases, a Vitruvian Number derived from your birth date, the off-day finally made legitimate: 28 Signal is a daily guidance app, free to start, on iOS and Android.