Calendar: the full 2026 year grid, each written day a white disc, exercised days marked with a taijitu Calendar: the same year with the Chinese zodiac column revealed, the Year of the Horse lit Calendar: October pinned, showing Roman week numerals, the date-and-weekday column, and a moon-phase strip

Calendar

Map your life.

State

  • Written
  • Written & exercised
  • Unwritten
  • Reminder waiting

Marks

  • One event
  • Multiple events
  • Today
Chronicle: a diary entry whose timestamps are each drawn in the colour of their hour

Chronicle

Preserve your memories.

Patterns: two twelve-hour rosettes charting the hours you write, with a diamond hub and day-cell legend Patterns: an AM hour selected, its Breguet numeral lit and the hour’s entry count read in the hub Patterns: the places list revealed Patterns: the Berlin filter applied, the rosettes and totals redrawn for that city

Patterns

Analyse the cadence of your existence.

Aion Moon Phases widget alongside Calendar, Battery, and World Clock widgets on the macOS desktop

Widget

Admire the moon.

Morphological cursor

Tilts for italics. Thickens for bold.

00:24 — Once upon a time I saw a hue of blue so transcendentally beautiful and bright it made me think the filaments of heaven itself had finally been struck alight.

Integrated terminal

Commands from the page. The specimen shows four commands: !remindme sets a reminder for tomorrow, /reminders lists the reminders waiting, /similar finds entries like the one above, and /moon shows the day’s moon phase.

12:24 — this is the marble index of a mind, forever, voyaging through strange eons of thought, alone

!remindme tomorrow read more Wordsworth

Apple Reminders

Ambient vocabulary enrichment

Distilling intricate words from Editions and elsewhere. 100+ such definitions surface intermittently in the footer.

noctilucent
of the highest clouds, visible only in deep twilight, lit by a sun already below the horizon
sexagesimal
reckoned in sixties, as the minutes of an hour and the degrees of a circle
hypnagogic
relating to the drowsy, transitional state between waking and sleep
velarium
the great awning drawn over a Roman amphitheatre to shade the crowd
nychthemeron
a full period of a day and a night together, twenty-four hours
cymophane
cat's-eye chrysoberyl, a yellow-green gem crossed by one wavering band of light

In Aion, time has colour.

Every minute of the day has its own hue.

$29

One-time purchase.
Available on the App Store.

Download

US dollars. The App Store sets local prices.

PlatformmacOS 15.6 or later
ArchitectureApple silicon & Intel
DependenciesNone
NetworkNot required
Data formatJSON, human-readable
ExportText · Markdown · PNG

Release notes via email.