Zulu Face
A minimalist watch face built around Zulu (UTC) time - for pilots, sailors, sysadmins, and anyone who lives across time zones.
The Idea
Pilots plan and fly in Zulu. Mariners log positions in UTC. Astronomers, radio operators and others timestamp in UTC too. Anyone coordinating across time zones - distributed teams, satellite spotters, traders, military personnel - needs the same clock everyone else is reading.
Zulu Face is a Wear OS watch face that puts that clock front and centre. Local time in green, Zulu time in red, stacked one above the other. No flipping between displays, no math, no second-guessing. The whole time group tilts gently with your wrist, like the horizon on a cockpit attitude indicator - over a pure black background.
Out of the box, that's the whole face: the two times and the horizon on pure black, working with zero setup - no network, no account, no phone. Want a silhouette and a colour of your own? Open Zulu Face on the watch and pick them - your choice stands behind the numbers right away.
Screenshots
Features
Dual time, stacked
Local time on top in green, Zulu (UTC) below in red. Both large and centred, split by a thin horizontal separator. No swiping, no taps - read either without thinking.
Artificial horizon
The two times and the separator tilt gently with your wrist, like the horizon on a cockpit attitude indicator - over pure black.
Always on, still readable
Lower your wrist and the face stays on: both times and the separator stay readable on the dimmed screen. The silhouette goes stealth and animation stops - nothing moves for hours on end. Raise your wrist and everything resumes as usual.
Silhouettes
Air, sea and space vehicles, plus more - all things that keep Zulu time, each drawn to read clearly behind the numbers. Or pick Stealth, the picker’s "none", and nothing stands behind them at all.
Colour grid
A grid of colour tints - greys, blues, teals, ambers, reds, purples - colours the silhouette behind the numbers. Tap a colour, done.
Assigned daily
Turn on Daily and the planning passes to the day: each midnight brings a new silhouette in your colour. Pick a specific one any time to take it back.
Subtle 3D effect
As you tilt your wrist, the silhouette shifts slightly against the numbers, giving the flat screen a sense of depth - subtle enough never to pull focus from the time.
Runs on the watch, no phone
The whole picker runs on the watch itself. There's no phone app, no pairing, no account sign-in - tap the face and choose right on your wrist.
Fully offline, nothing to grant
Time comes from the system clock alone. No network calls, no GPS, no location services, no account, nothing to grant at install. Works on a flight, in a tunnel, in airplane mode.
Energy efficient
The watch face never wakes the network radio and runs nothing of its own - two of the biggest drains on a watch battery. It costs little more than the pixels it lights.
Principles in practice
No Play ServicesThe 10 EiBPM principles, and how Zulu Face lives up to each.
- No AdsNo ads, ever. You're not the product.
- No TrackersNo tracking of any kind. No analytics, no fingerprinting, nothing sent anywhere.
- No AccountsNo signup, no email, no profile. Install and use it.
- No Data CollectionThere's no server. The watch face stores nothing of its own - it just reads the clock.
- No Location SpyingZulu Face never asks for location - UTC and your local time both come from the system clock, not from where you happen to be.
- Offline as DefaultZero network calls anywhere. Time is read from the system clock alone. Works on a flight, in a tunnel, in airplane mode.
- Privacy by DefaultNothing for you to confirm - no location, no internet, no storage access. The few permissions Zulu Face declares are granted automatically: one to install its own watch face, two to let the daily change run on time, even after a restart.
- Clear DesignTwo times, one separator, tilting gently with your wrist. Everything else gets out of the way.
- Low PowerThe watch face runs nothing of its own in the background - the system simply draws it - so it barely touches your battery.
FAQ
Why "Zulu"? What does UTC have to do with the letter Z?
In the NATO phonetic alphabet, Z = "Zulu". The international military and aviation convention names time zones by letter - A through Z, skipping J - with Z being the prime meridian (Greenwich, UTC). So "Zulu time" is shorthand for UTC, the one global reference everyone can agree on. Pilots, mariners, system engineers and ham-radio operators have all adopted it for the same reason: a single number that means the same thing in Lima and London.
What about daylight saving time?
Zulu never shifts. Local time does, and not in step: Europe and North America change on different dates, the southern hemisphere moves the other way, and much of the world does not change at all. Converting in your head means knowing which of those applies today in every place involved - and there may be several. Zulu Face sidesteps it - red is always Zulu, green is always the watch’s local time.
Why green for local and red for UTC?
It's a nod to aviation instrument convention - green for normal operating values, red for the value that needs the most attention. UTC is the one you can't get wrong when filing a flight plan or reading a server log, so it gets the red treatment.
How do I change the silhouette and colour?
Open Zulu Face on the watch: it starts on the list of silhouettes, and a second screen holds the colour grid. Pick one of each and the face shows it immediately - no phone, no settings app, nothing to confirm. Pick Stealth and the numbers sit on pure black again.
What's the "Daily" option?
Chance takes over the planning. Turn it on and every midnight the face is assigned a different silhouette - you do not pick it, though it still wears the colour you chose. You keep it until the next one, indefinitely, without ever reopening the app. Pick a specific one any time to take the planning back.
Why these silhouettes?
Because they all keep Zulu time. Pilots file flight plans in it, mariners log positions in it, satellites and spacecraft timestamp in it, radio operators and server rooms run on it. The roster is a quiet nod to everyone reading the same clock. They are also chosen for legibility against the time display: high-contrast outlines that read at a glance without competing with the numbers.
Which watches does it run on?
Wear OS 6 or newer. That version is what lets a single app carry its own watch face, which is exactly what Zulu Face is: one install bringing the face and the picking together. On older Wear OS versions it cannot be installed.
Does it need internet?
No. Time comes from the system clock, which is already keeping itself synchronised by whatever method the OS chose (NTP via WiFi, cellular operator broadcast, GPS). Zulu Face doesn't add to that - no network calls of its own, ever.
Privacy
Zulu Face follows the EiBPM principles - no ads, no trackers, no accounts, no servers. Here's what that means for Zulu Face.
What Zulu Face collects
Nothing. No accounts, no analytics, no ads, no crash reporting - and there is no EiBPM server to send anything to.
Permissions
None to grant. Zulu Face requests no runtime permission - no location, no internet, no storage access. It declares three that Android grants automatically at install: one to install its own watch face, and two that let the daily change run on time, even after a restart.
Retention & control
All app data stays in the app's private, on-device storage. Uninstalling removes everything.
Distribution
As a Wear OS app, Zulu Face is distributed through Google Play - the only practical, device-independent channel for watches (vendor stores are device-specific). The app itself adds no Google licensing or integrity checks and makes no calls to Google; Google Play and Play Services have their own data practices, outside our control.