1. Home
  2. 🔧 Utilities
  3. Emerald Chronometer
Emerald Chronometer

Emerald Chronometer

by Scapa Flow, LLC

105 ratings
63 reviews
🔧 Utilities
🎬 Entertainment
Free

Details

  • Released
  • Updated
  • February 1, 2019
  • May 5, 2026

Developer

Scapa Flow, LLC
✨Promote your app ✨
Emerald Chronometer screenshot #1 for iPhone
Emerald Chronometer screenshot #2 for iPhone
Emerald Chronometer screenshot #3 for iPhone
Emerald Chronometer screenshot #4 for iPhone
Emerald Chronometer screenshot #5 for iPhone
⭐63
Reviews↘︎
📝20+ tags
Tags↘︎
🔄6+ apps
Alternatives↘︎
❓5 answered
FAQ↘︎
📦~ in 1 year
Updates frequency↘︎
🖼️Get Icon
Icons↘︎

About

Experience highly detailed mechanical watch faces with advanced astronomical and clock complications. Track celestial events, manage time with precision, and explore historical and future dates with interactive displays. Optimized for iPhone and iPod touch.

✓Accurate astronomical data (4000 BCE - 2800 CE)
✓Sun, Moon, and planet rise/set times
✓Mechanical display of Moon phases
✓Precise local and UTC time
✓Chronograph with split timer
✓World-time and calendar watches
✓Interactive time-travel simulation
Show original description

What's New in Emerald Chronometer

4.1

May 5, 2026

Optimized for iOS 26, this version has the same original watch faces.

User reviews

Most RecentHighest RatedLowest Rated

It’s Back! and beautiful!

The new release of Emerald Chronometer is faithful to the original that had its support dropped in 2023. The chronometers are beautiful and the complications are great! Get it! You will be glad you did.
Ron CharltonRon Charlton

It's back! ^.^

What a pleasant surprise! I have stubbornly hung on to this app, even though it had been officially discontinued, as long as I don't delete it, it would make it to my new phone and I could enjoy it functionality and elegance. And here it is, acquired, by all portents, by another artist as in love with the concept, but obviously, also a capable programmer who will bring it up to current OS expectations! I'm overjoyed! Thank you! ^.^
Show more
Dave Mac ^.^Dave Mac ^.^

Sad day today

Really wish this app wasn’t going away. I guess I missed my opportunity to get a replacement iPad so I could have Obsevatory again.
Is there any chance that this would be available elsewhere, to install on a jail broken device?

This breaks my heart.

These were the best apps ever available for iOS — these and the IK Multimedia music apps.

You guys are the best. Hate to lose you.
Show more
Lech mir am arschLech mir am arsch

What a gift!

So sorry to see the app ending. I have enjoyed this app so much since it came out, and learned much about time, time keeping, design, astronomy, history. What a joy it has been. Hands down the best iPhone app I’ve ever purchased. I will retire my current iPhone with no further operating system updates in hopes of preserving Chronometer for awhile longer.
Thank you for all the work (joy, love) you’ve put into it over the years.
Show more
PTcardiologistPTcardiologist

Thanks and farewell

Again, many thanks for all the many watch faces.
Dent De LeonDent De Leon
See 58 more reviews

Developer apps

MonthlyPaymentCalc
MonthlyPaymentCalc

by Scapa Flow, LLC

💰 Finance

(6)

$0.99
Repertoire
Repertoire

by Scapa Flow, LLC

📚 Education

(10)

Free
Get Ready!
Get Ready!

by Scapa Flow, LLC

📊 Productivity
$2.99
Colorado Institute of Music
Colorado Institute of Music

by Scapa Flow, LLC

🎵 Music

(4)

Free
See developer apps

FAQ

What does Emerald Chronometer do?

Emerald Chronometer provides highly detailed simulations of high-end mechanical watch faces. These watches feature complex 'complications' such as astronomical tracking for the Sun, Moon, and planets, as well as precise clock functions like chronographs and world time displays. The app aims to replicate the look and feel of real mechanical objects while leveraging the accuracy of your iPhone.

What are the key features of Emerald Chronometer?

Key features include highly accurate astronomical data spanning from 4000 BCE to 2800 CE, with times for rise and set of celestial bodies. It offers mechanical displays for Moon phases, relative planetary positions, and compass functions. Clock features include precise local and UTC time, a chronograph with split timer, an alarm clock, and world-time and calendar watches.

How much does Emerald Chronometer cost?

Emerald Chronometer is a paid application. The price is a one-time purchase, and there are no in-app purchases or subscriptions mentioned for this product. Please check the app store for the current pricing.

What devices is Emerald Chronometer compatible with?

This version of Emerald Chronometer is optimized for the iPhone and iPod touch. A separate product, Emerald Chronometer HD, is available and optimized for the iPad. The app requires iOS 4 or later for certain notification features.

How can I use Emerald Chronometer for common use cases?

Users can use Emerald Chronometer to explore detailed astronomical events, such as predicting eclipses or tracking the positions of planets. It also serves as a sophisticated timekeeping tool with its chronograph and world-time functions. The interactive nature allows users to 'zoom through time' to observe celestial changes, making it useful for educational purposes or simply appreciating the complexity of mechanical watchmaking.