Emerald Chronometer is a stunning high-end mechanical watch face app available for iPhone. Developed by Emerald Sequoia LLC, this app offers a collection of watch faces that replicate the complexity and elegance of real mechanical watches. With accurate timekeeping and location features, Emerald Chronometer combines the best of both worlds.

One of the standout features of Emerald Chronometer is its astronomy capabilities. It provides highly accurate data from 4000 BCE to 2800 CE, including the times of rise and set for the Sun, the Moon, and the 5 classical planets. The app also displays the correct shape and orientation of the Moon in all phases, giving it a truly mechanical feel.

In addition to astronomy features, Emerald Chronometer offers a range of clock features. It includes day/date/month/year indicators, local and UTC time, and a chronograph with split timer accurate to 1/10th of a second. The app also features an alarm clock, interval timer, and world-time watch with a 24-city ring.

With 16 watches and 27 watch faces in total, Emerald Chronometer provides a wide variety of options for watch enthusiasts. The app allows users to interact with the watches by tapping on the crown and moving the hands, or zooming through time by pressing and holding on a date window.

Overall, Emerald Chronometer is a beautifully designed app that brings the sophistication of high-end mechanical watches to the iPhone. Whether you're interested in astronomy or simply appreciate the craftsmanship of mechanical timepieces, this app is worth exploring.

Note: For iPad users, there is a separate product called Emerald Chronometer HD optimized for the iPad.