The living 260-day count of the Aztec/Mexica calendar — your day-sign, its fire, and a daily practice in its rhythm.
How it works
The same short walkthrough shown the first time you open the app:
Tonalli — The Fire in Your Day — The Tōnalpōhualli: the 260-day sacred count of the Aztec/Mexica calendar, first read (myth says) by the day-keepers Cipactonal and Oxomoco. Twenty day-signs, thirteen numbers, computed with the Caso correlation. Today has a character; so do you.
Twenty Day-Signs, Thirteen Numbers — Each day pairs one of twenty day-signs with a number from one to thirteen — a quality and an intensity. The wheel turns through all 260 combinations before a day repeats.
A Living Correlation, Honestly Uncertain — This app uses the Caso–Nicholson correlation, the scholarly standard, anchored to the fall of Tenochtitlan (13 August 1521). Scholars do not fully agree on the exact alignment across five centuries — the app says so plainly rather than claim false precision.
A Daily Practice, Hidden in a Story — Each day's sign sets the quality, and brings one short, true-to-life scenario: read today's day-sign and number, live the scenario and make three choices, and watch your four-directions star grow.
Ask Anything — Ask about today's day-sign, your birth sign, a number, or the tradition itself — the current count and your birth details are already in view. Plain language, any time.
Watch Your Light Grow — Your choices quietly gather into the Four Tezcatlipocas — Xipe Totec's renewal, Tezcatlipoca's reflection, Quetzalcoatl's wisdom, Huitzilopochtli's resolve. No scores to chase: a light that grows over a lifetime of practice.
Add Your Birth Date — The day-keeper's first question: when were you born? Your birth date finds your day-sign and number, and colours every reading with them. Optional — and everything stays on your device.
Getting started
Open the Today tab — see today's day-sign and number in the Tōnalpōhualli, the 260-day sacred count of the Aztec/Mexica calendar.
Take the daily practice — a short scenario carrying today's day-sign energy. There are no wrong answers.
Enter your birth date in Settings to reveal your own day-sign and number — the character you were born under.
Watch your Growth profile take shape from your responses over the days.
The tradition behind it
The Tōnalpōhualli ("count of days" in Nahuatl) interlocks 20 day-signs with 13 numbers into a 260-day round — the sacred calendar of the Aztec/Mexica and the wider Mesoamerican world. Each person carries the character of their birth day; the day being lived always has one too. The app computes both with the Caso–Nicholson correlation, the scholarly standard for aligning the ancient count to our own calendar, entirely on your device.
What's inside
Today's day-sign
The current sign and number, with the quality it carries — the frame for each day's practice.
Your day-sign
Enter your birth date to find the sign and number you were born under.
Calendar
Browse the full 260-day round: every sign, every number, and where today sits in the wheel.
Ask & Growth
Question the tradition, and let a behavioural profile grow from your daily choices.
Morning guidance
Optional morning notifications greet you with the day's sign and number — composed on your device, opt-in, off any time in Settings.
Subscription
Tonalli offers a free trial period, after which a low-cost subscription unlocks full personalised access. Exact pricing and any current offers are shown in the app at the point of purchase, and via your device's app store account settings.
Privacy
Your birth date stays on your device; only the prompt for your reading is sent to our server, with no account or identifier attached. Read the full privacy policy.
Common questions
How exact is the correlation to our calendar?
As exact as the scholarship allows. The app uses the Caso–Nicholson correlation, the scholarly standard, anchored to the fall of Tenochtitlan (13 August 1521) — but it says plainly that scholars don't fully agree on the precise alignment across five centuries, rather than presenting false precision.
What does my day-sign mean?
A character, a set of strengths and cautions — closer to a temperament than a horoscope. The app presents each day-sign's traditional associations and lets your daily practice explore how they show up in you.
Does it work offline?
The calendar and your day-sign are computed on the device. The daily scenario and Ask need a connection to our generation service.