Emerald Chronometer vs World Clock Pro
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Emerald Chronometer
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
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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.)
World Clock Pro
Easily track and convert time across multiple global time zones. Schedule events, share accurate times instantly, and access a vast database of cities and time zones. Ideal for international communication and planning.
- Universal clock access
- Effortless time conversion
- Schedule calendar events
- Instant time sharing
- Large city and timezone database
- Automatic timezone updates
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TIMEZONE CALCULATOR – YOUR ULTIMATE WORLD TIME COMPANION Master global time with a tool that is clear, concise, and built for busy international lives. Whether you’re scheduling business meetings or connecting with friends overseas, World Clock Pro keeps you in sync—simply and directly. ESSENTIAL FEATURES UNIVERSAL CLOCK ACCESS: View accurate times in cities around the world—New York, London, Tokyo, Sydney. No fuss, just the facts. EFFORTLESS TIME CONVERSION: Swipe to convert and compare time zones with precision. Plan your calls and meetings with ease. SCHEDULE WITH CONFIDENCE: Create and integrate calendar events quickly. Organize trips, group activities, and international calls without confusion. INSTANT TIME SHARING: Share exact times via email, SMS, social media, or messengers. Coordination is just a click away. HUGE CITY & TIMEZONE DATABASE: Access over 160,000 cities and popular time zones like GMT, UTC, EST, and PST at your fingertips. WHY THIS APP MATTERS Say goodbye to timezone confusion. This isn’t just another world clock—it’s a powerful tool for global thinkers, frequent travelers, and anyone who values clear, reliable time data. Streamline your schedule and manage your day without delay. EXTEND YOUR EXPERIENCE For a deeper dive into global time management, World Clock Pro is also available on Mac. Just search “World Clock Pro” in the Mac AppStore * * * World Clock Pro offers a premium subscription: Subscribe to get access to unlimited timezones, and timely automatic updates of our timezone database of more than 160,000 locations and timezones. – Length of subscription: 1 month or 1 year – Payment will be charged to iTunes Account at confirmation of purchase – Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period – Account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal – Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase – Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable – Terms & Conditions: https://timemaster.s3.amazonaws.com/Time-master-terms.pdf – Privacy Policy: https://timemaster.s3.amazonaws.com/Time-master-privacy-policy.pdf
Screenshots
Verdict
The clearest difference is in-app purchases: Emerald Chronometer at none against World Clock Pro's 6. Emerald Chronometer also leads on review sentiment (97% vs 77%). World Clock Pro's advantage is update cadence (every 2 months vs every 22 months) and ratings volume (1.3K vs 105). On price, rating and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. World Clock Pro sells 5 in-app purchases, starting at $1.99 per month. Emerald Chronometer asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 4.9 for Emerald Chronometer against 4.8 for World Clock Pro. That said, the two scores are not equally well evidenced: World Clock Pro has 1.3K ratings behind it against 105, so its average is the more settled of the two. Written reviews are what separate them: 97% of Emerald Chronometer's written reviews are positive against 77% of World Clock Pro's.
Emerald Chronometer ships an update every 22 months, World Clock Pro every 2 months. The most recent releases landed on October 6, 2026 and October 11, 2026 respectively.
| Parameter | Emerald Chronometer | World Clock Pro |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (105 ratings) — better | 4.8 (1.3K ratings) |
| Positive reviews | 96.8% of reviews — better | 76.7% of reviews |
| Number of ratings | 105 | 1.3K — better |
| Update frequency | Every 22 months | Every 2 months — better |
| Ads | — | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid — better | Subscription |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 311 MB | 41 MB |
| Age rating | 4+ | 4+ |
| Developer | Scapa Flow, LLC | Alex Komarov Inc. |
Customer experience
Emerald Chronometer
World Clock Pro
Bugs and requests
Emerald Chronometer
Not enough reviews yet to summarise bugs or requests.
World Clock Pro
Reported bugs
3 issues- Widget not working on iOS 14 and newer
- Issues with local time zone detection and display
- Inconsistent behavior after app updates
Requested features
4 requests- Add date function for future time zone changes
- Ability to customize and sort displayed time zones
- Implement an Apple Watch app
- Improve widget functionality and customization
In-app purchases
Emerald Chronometer
No in-app purchases
World Clock Pro
- 1 month$1.991 Month
- 1 month2 variants$2.991 Month
- 1 year3 Days trial$9.991 Year
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- 1 year3 Days trial$11.991 Year
- 1 year3 Days trial$19.991 Year
Questions
Is Emerald Chronometer free?
Is World Clock Pro free?
Which has better reviews, Emerald Chronometer or World Clock Pro?
Which is updated more often, Emerald Chronometer or World Clock Pro?
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