Emerald Observatory for iPad vs Digital LED Clock
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Emerald Observatory for iPad
This app provides a comprehensive astronomical display on a single screen, offering detailed information about celestial bodies and timekeeping. It features a heliocentric orrery, rise and set times, twilight information, and moon phase details. Users can navigate through time and set alarms for astronomical events.
- Astronomical information display
- Heliocentric orrery
- Rise and set times for Sun, Moon, planets
- Twilight times
- Moon phase and orientation
- World map of day/night regions
- Eclipse simulator
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Emerald Observatory displays a wealth of astronomical information all on one screen, in a unique but understandable format. Information includes: - 12- and 24-hour ordinary clock time - Times of rise and set for the Sun, the Moon, and the 5 classical planets - Times of the beginning and ending of twilight - Heliocentric orrery (display of the planets in orbit around the Sun) - Altitude and azimuth for the same bodies (one body at a time) - Current phase and apparent orientation and relative size of the moon - Current regions of day and night on a world map - The Equation of Time, solar time, UTC time, and sidereal time - Month, day, year, and leap-year indicator - Daily alarm (delivered as local notification on iOS 4+ if app is not running) - Eclipse simulator - Displayed times are synchronized via NTP to "atomic clock" standard - Uses iPad location, or the latitude and longitude may be set manually A setting is available to allow the display to stay on continuously. Tap on the display to move forward by a month, day, year, hour, or minute. A detailed manual for the operation of Emerald Observatory can be found at the "Emerald Sequoia LLC Web Site" listed below, at http://emeraldsequoia.com/eo/ 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 but we can't fix it if you don't report it (and we have no way to respond to Customer Reviews on iTunes). (NTP requires Internet access. Like all apps Emerald Observatory can not change the device's internal clock.)
Digital LED Clock
This utility app displays the current time in a dot matrix LED style. It offers both vertical and horizontal orientations, 24-hour or AM/PM format, and customizable color options. The interface is minimalist, with settings accessed by double-tapping the screen.
- Dot matrix LED time display
- Vertical and horizontal orientation
- 24-hour or AM/PM format
- 10 color options
- Disable auto-lock functionality
- Double-tap to access settings
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Digital LED Clock App is a simple clock app. Display the current time in dot matrix LED style! The time display screen has been made extremely simple by eliminating the menu icon. It supports both vertical display and horizontal display. It can be switched between 24-hour and AM / PM display. Please choose your favorite color from 10 colors. The setting menu is displayed by double tapping the screen. You can keep displaying the screen by turning on "Disable Auto-Lock". Disable Auto-Lock of iPhone or iPad only when running the app.
Screenshots
Verdict
The clearest difference is review sentiment: Emerald Observatory for iPad at 99% against Digital LED Clock's 50%. Emerald Observatory for iPad also leads on price (Free vs $1.99) and rating (4.9 vs 3.0). Digital LED Clock's advantage is device support (3 vs 1) and iOS requirement (12.0 vs 17.0). On ads, in-app purchases and monetization model 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
Emerald Observatory for iPad is free to download; Digital LED Clock costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Emerald Observatory for iPad holds the better App Store score, 4.9 against 3.0. That said, the two scores are not equally well evidenced: Emerald Observatory for iPad has 95 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 99% of Emerald Observatory for iPad's written reviews are positive against 50% of Digital LED Clock's.
Emerald Observatory for iPad ships an update every 5 months, Digital LED Clock every 40 months. The most recent releases landed on October 22, 2026 and October 19, 2026 respectively.
| Parameter | Emerald Observatory for iPad | Digital LED Clock |
|---|---|---|
| Price | Free — better | $1.99 |
| Rating | 4.9 (95 ratings) — better | 3.0 (2 ratings) |
| Positive reviews | 98.6% of reviews — better | 50.0% of reviews |
| Number of ratings | 95 — better | 2 |
| Update frequency | Every 5 months — better | Every 40 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 16 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | Bjorn Freeman-Benson | Kei Suefuji |
Customer experience
Emerald Observatory for iPad
Digital LED Clock
Bugs and requests
Emerald Observatory for iPad
Requested features
14 requests- Port to screen wallpaper
- Large wall clock version
- Apple TV version
- Support for Uranus, Neptune, and Pluto
- iPhone and Apple Watch versions
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- Alarm functionality
- Screen dimming for night use
- Numeric display of values
- Switch altitude/azimuth by touching planet
- Push notifications for specific events
- Custom chime sounds for events
- Round earth display to match moon display
- iPad version of Chronometer iPhone app
- Tutorial mode or on-screen help
Digital LED Clock
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Emerald Observatory for iPad
No in-app purchases
Digital LED Clock
No in-app purchases
Questions
Is Emerald Observatory for iPad free?
Is Digital LED Clock free?
Which has better reviews, Emerald Observatory for iPad or Digital LED Clock?
Do Emerald Observatory for iPad or Digital LED Clock have ads?
Which is updated more often, Emerald Observatory for iPad or Digital LED Clock?
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