Precision Countdown
Exact time remaining or elapsed for any moment you set — down to the second, updating live on every tick.
Aeterna replaces your new tab with a chronometer for the moments you actually care about — a countdown to launch day, an anniversary, a deadline, a birthday. Every open tab shows exact elapsed or remaining time, orbiting planets that track real celestial mechanics, and an ambient soundscape tuned to how close you are to the moment.
Not a screen recording, not a mockup — the real Aeterna app, seeded with a demo epoch (Voyager 1's 1977 launch). Add your own epoch, rename it, switch calendars, open the orbit view. Nothing you do here touches a real installation; this session is fully isolated and resets whenever you like.
Exact time remaining or elapsed for any moment you set — down to the second, updating live on every tick.
Round-number milestones (1 year, 1,000 days, 1 billion seconds) trigger an on-canvas confetti burst the moment they land.
A canvas orrery of orbiting planets and starfield, driven by your epoch’s actual elapsed time — not decoration, a readout.
Procedural drone, clock-tick, and harmony presets that shift with how close you are to your moment.
View the same instant as Unix time in decimal, hex, and binary, a Mayan Long Count date, or the French Republican calendar.
Seal a message to your future self, locked until a date you choose.
Project any future date against your active epoch to see age, total days, lunar/Mars/Jupiter orbit counts, and galactic progress at that moment.
Strip the interface down to just the countdown — no sidebar, no chrome, nothing but the number that matters.
A strict 4-step grayscale theme with zero motion, tuned for e-ink displays and distraction-free viewing.
$0.99/mo
Billed yearly, from $11.88/yr — choose $0.99, $1.99, $2.99, or $4.99/mo.
$29once
One-time payment, yours forever.
The core countdown, milestones, orbit view, and calendar conversions are free and unlimited — premium unlocks the extras above.
Add to Chrome — it's free