iPhone Screenshots


These models of high-end mechanical watch faces contain many of the most complex "complications" found in real watches, plus refinements found nowhere else. All displays maintain the look and feel of real mechanical objects, but with the time and location accuracy of the iPhone.

NOTE: This app (Emerald Chronometer) is optimized for the iPhone and iPod touch. Please also see Emerald Chronometer HD, a separate product optimized for the iPad.

Astronomy features:
- Highly accurate data from 4000 BCE to 2800 CE
- Times of rise and set for the Sun, the Moon, and the 5 classical planets
- The correct shape and orientation of the Moon in all phases but still using a mechanical display
- Relative positions of the Sun, Moon, 6 planets and the constellations of the zodiac
- "Compass functions" show the elevation and azimuth of the Sun, the Moon, and the 5 planets
- The Equation of Time, solar time and sidereal time
- Eclipse predictor (lunar node indicators and separation indicator)
- User settable geographic location and timezone using an 80,000 city database
- A unique face showing the rise and set times of all 5 classical planets plus the Sun and the Moon at once

Clock features:
- Day/date/month/year indicators, using mechanical wheels
- Local and UTC time
- Chronograph (stopwatch) with split timer, 1/10 sec accuracy
- Alarm clock and interval timer; notifications are delivered in iOS 4 if the app is not running**
- World-time watch with 24-city ring on one side and 4 subdials on the other
- Calendar watch with rotating wheels showing a full month at a time
- Most watches with 1/5 sec or 1/10 sec precision
- Synchronized with standard atomic clocks via NTP

There are 16 watches in all, with 27 total watch faces (including front and back sides).

A setting is available to allow the display to stay on only when plugged in.

Play with the watches by tapping on the crown and moving the hands, or press and hold on a date window to zoom through time to see the effect on the heavens. Then just use them to show you when it's time for a break.

A complete description of each application feature can be found in the built-in Help screens and on the Emerald Sequoia LLC Web Site, which also includes a demo movie. A developer's blog may also be found at http://emeraldsequoia.com/esblog/ .

If you are having any trouble with the application whatsoever, please see our FAQ on the support page listed below and then contact us through that page if your problem is not resolved. We take pride in responding promptly to all support email requests.

**NTP accuracy is not guaranteed for alarm delivery if the app is not running. (NTP requires Internet access. Like all apps Emerald Chronometer can not change the device's internal clock.)

What's New

Version 3.9.5

- Support for iOS 10
- Miscellaneous bug fixes

Customer Reviews

4.4 out of 5

9 Ratings

9 Ratings

Exceptional beauty - extraordinary information


Great blend of art and technology to satisfy both your inner aesthete and gadget geek.

Four years later I still open it several times a week to sit on my desk in the charger, or just to play. Also fun to show off.

lock screen widget needed! Urgent! ;-)


yep, it'd be perfect if lock screen widget is available for this app.


Doremi Fasolati

I love having the moon phase and face on my watch. I have owned a couple of inexpensive analog watches in the past with the moon feature, so when I began searching for another one it occurred to me to look for an app for my iPhone 6 Plus instead. That's when I discovered these apps from Emerald Sequoia. The free module has just one watch face, Geneva, which happens to be my favorite. But as soon as I saw it I laid down the $1.99 and bought the whole set. There's no advertising even in the free edition. Exploring the features of all the watches in the $1.99 collection is like taking a college course in cosmology and worldwide timekeeping. It's a graphic delight and has taken the place of the cryptograms and other word games that used to amuse me. Some watches have a face on the "reverse". Tap 'i' for information and the explanation that accompanies each watch is thorough and teaches this worldly old man a lot I didn't know yet. I've had no issues with this app except that I almost can't put it down.


Emerald Sequoia LLC
83.9 MB
Requires iOS 9.3 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© 2008-2016 Emerald Sequoia LLC


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

More By This Developer

You May Also Like