# Emerald Chronometer HD > Simulated high-end mechanical watch faces with advanced astronomical and clock complications. (iPhone/iPad app by Emerald Sequoia LLC.) - Source: https://appshunter.io/ios/app/emerald-chronometer-hd/id435033000 (this page in markdown: same URL + `.md`) - Developer: [Emerald Sequoia LLC](https://appshunter.io/developer/284953673) - Category: Utilities, Productivity - Price: Free - Rating: 5.00/5 from 17 App Store ratings · 27 written reviews indexed - Age rating: 4+ - Requires: iOS 15.0 · 310 MB - Languages: English - Released: 2011-05-05 - Data updated: 2026-06-10 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/emerald-chronometer-hd/id435033000/reviews.md ## What is Emerald Chronometer HD? 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 HD) only works on the iPad. Please also see Emerald Chronometer, a separate product optimized for the iPhone and iPod touch. The products have exactly the same watches and are identical except that this HD product has the ability to rotate the display, increased resolution on the watches, and larger settings panels. 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 - Most watches with 1/5 sec or 1/10 sec precision - Synchronized with standard atomic clocks via NTP There are 15 watches in all, with 26 total watch faces (including front and back sides). The app works equally well in landscape mode and portrait mode, and 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. Like all apps Emerald Chronometer can not change the device's internal clock.) ## Key features - Simulated mechanical watch faces - Advanced astronomical complications - Accurate time and location data - Chronograph and alarm functions - Interactive time manipulation - Eclipse predictor ## Recent user reviews (10 of 27) All indexed reviews: https://appshunter.io/ios/app/emerald-chronometer-hd/id435033000/reviews.md ### 5/5 — Thank You forOne of My All-time Favorites *2023-09-18* This has been one of my very favorite programs for many years. I understand the authors’ need to end their support, but still I am sorry to see it go. I’m very grateful to have had it so long. ### 5/5 — A venerable Timepiece App *2023-03-15* I’ve had this timepiece app for most of its existence from 2008. It still holds up very well with solid graphics and numerous watch faces and functions. When the first Apple Watch came out in 2015, it no doubt adversely impacted dedicated iPad watch apps but the developer of this app kept until last year. Hopefully it’s not the end of updates for the app but it will likely work for a long time to come. ### 5/5 — It’s Complicated *2021-05-17, version 3.9.8* I’ve used the “Chronometer” for iPad and for iPhone for years and visit the various faces everyday. My favorite is the Geneva, because there is just so much information there. I really wish there were a face for the Apple Watch, but I understand that Apple has restrictions. I wish it could be worked out somehow, because there aren’t any more beautiful watch faces for astronomy lovers than the ones that the Chronometer shows. I tried buying a watch that ran WearOS, but the experience just wasn’t as good as the Apple watch. So I went back to the Apple Watch and just visit the Chronometer faces on my iPhone and iPad. ### 5/5 — Exquisite *2019-12-19, version 3.9.5* Amazing. We all have preferences for how some things should be different, feature requests, and so on, but the only real hope I have is that this will stay compatible with the upcoming OS releases in at least the foreseeable future. ### 5/5 — instant analog IT fan - astronomy v astrology *2018-05-20, version 3.9.5* As a many-decades expert of both Information Technology, and privately as an Astrologer, went looking recently for an analog equivalent summary of datetime for casual glances at an iPad while working on a Windows laptop in languages Python and R. R of course is Linear Algebra, which in Western 'science' was borrowed very recently in the 19th Century from Babylonian and Chinese matrix mathematics circa 100 BCE. Similarly, Astrology was the root knowledge modern Astronomy dervied from, and similarly neither has gone away today. The analog depictions in the current App are fun, a few touch on the eye-visible 7 traditional planets, however use rise / set Geocentric visible times for location v. Astrological Asc / Desc calculations. What could be added? (1) Pluto, Neptune, Chiron, Uranus, the Nodes of the Moon. (For full Astrological calculations, depictions, see AstroGold for comparison.) (2) Add also a Settings switch between contemporary astronomical Zodiac calculations (which drift over time), or optionally Astrological Zodiac (30 degrees each, 12 signs, positions set to fixed reference roughly 2000 years ago). Fun! -reminder everything we do with digital hand-held devices has roots in the Real World, get grounded now! ### 5/5 — All TIME Favorite *2015-07-10, version 3.9.2* This was one of my first app purchases, and it is still my favorite of all. Beautiful display(s) and astronomical accuracy. You will learn a great deal. ### 5/5 — Great Watch for iPad *2015-02-05, version 3.9.1* Just bought this app for my iPad Air 2. Was using the iPhone version on my iPad. The iPad version is a major improvement over the iPhone version and well worth the five dollar price. You can select multiple clocks and see them actually working in horizontal mode! ### 5/5 — Great *2015-01-05, version 3.9* What can I Say!!! Great. Amazing. Love it. Thanks ### 3/5 — Nice app *2014-10-10, version 3.9* There are some nice watch faces in this app. Only three stars because I specifically would like to see both an astrology face that shows Asc and moon phase as well as planetary alignments, and a skeleton watch that shows the gears moving. ### 5/5 — Great *2014-03-17, version 3.9* Beautiful displays! I love these watches. I wonder if any are available for purchase... Likely way beyond my price I'm sure. Thanks Emerald, I love your software. Also Check out their Observatory, another hit. ## Frequently asked questions about Emerald Chronometer HD ### What does Emerald Chronometer HD do? Emerald Chronometer HD simulates high-end mechanical watch faces on your iPad. It includes many complex 'complications' found in real watches, such as astronomical features like rise and set times for celestial bodies, eclipse prediction, and accurate timekeeping with local and UTC time. The app aims to replicate the look and feel of mechanical objects while leveraging the accuracy of your device. ### What are the key features of Emerald Chronometer HD? Key features include highly accurate astronomical data from 4000 BCE to 2800 CE, times of rise and set for the Sun, Moon, and classical planets, and the correct orientation of the Moon. It also offers clock features like day/date/month/year indicators, local and UTC time, a chronograph with 1/10 sec accuracy, an alarm clock, and a world-time watch. The HD version specifically offers display rotation, increased resolution, and larger settings panels. ### How much does Emerald Chronometer HD cost? Emerald Chronometer HD is a paid application. The description does not mention any in-app purchases or subscription models, indicating a one-time purchase for the full functionality. ### What devices is Emerald Chronometer HD compatible with? Emerald Chronometer HD is specifically designed to work on the iPad. A separate product, Emerald Chronometer, is available for the iPhone and iPod touch. The HD version offers enhanced features like display rotation and increased resolution tailored for the iPad's larger screen. ### What are some common use cases for Emerald Chronometer HD? Common use cases include appreciating the intricate design and functionality of mechanical watches, tracking astronomical events like sun and moon rise/set times, predicting eclipses, and using the accurate timekeeping and chronograph features for daily tasks. Users can also interact with the watches to explore how celestial positions change over time. ## Version history (last 3 releases) ### 3.12.2 — 2023-10-23 * Built against latest development SDK * Includes some watches from the developers' workbench ### 3.11.1 — 2023-09-03 Warning message about company shutdown ### 3.10.1 — 2021-11-07 - Support for Dark Mode - Support for iOS 15 ## Apps similar to Emerald Chronometer HD | App | Rating | Price | Category | | --- | --- | --- | --- | | [GunRecords](https://appshunter.io/ios/app/gunrecords/id1191352925) | 3.1 (14) | $1.99 | Utilities | | [Cleaner Speaker Water Wave](https://appshunter.io/ios/app/cleaner-speaker-water-wave/id6447438880) | 4.3 (19) | Free | Utilities | | [It's on my list](https://appshunter.io/ios/app/its-on-my-list/id359021561) | 4.7 (7) | Free | Utilities | | [Calculator SC-323PU](https://appshunter.io/ios/app/calculator-sc-323pu/id301290196) | 4.7 (118) | $3.99 | Utilities | | [LSTclock: sidereal time clock](https://appshunter.io/ios/app/lstclock-sidereal-time-clock/id1510148631) | 3.8 (10) | Free | Utilities | | [SecureCRT](https://appshunter.io/ios/app/securecrt/id911124130) | 2.9 (31) | $9.99 | Utilities | ## More apps by Emerald Sequoia LLC - [Emerald Time](https://appshunter.io/ios/app/emerald-time/id290384375) - [Emerald Geneva](https://appshunter.io/ios/app/emerald-geneva/id347828665) - [Emerald Observatory for iPad](https://appshunter.io/ios/app/emerald-observatory-for-ipad/id364904759) - [Emerald Timestamp](https://appshunter.io/ios/app/emerald-timestamp/id371935298) All apps by Emerald Sequoia LLC: https://appshunter.io/developer/284953673 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*