Comparison

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.

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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.)

About

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.

Highlights
  • 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
Features
Read full description

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

Digital LED Clock4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard7 real differences · 3 level
Emerald Observatory for iPad versus Digital LED Clock: the parameters behind the verdict, then further details
ParameterEmerald Observatory for iPadDigital LED Clock
PriceFree — better$1.99
Rating4.9 (95 ratings) — better3.0 (2 ratings)
Positive reviews98.6% of reviews — better50.0% of reviews
Number of ratings95 — better2
Update frequencyEvery 5 months — betterEvery 40 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPadiPhone, iPad, iPod — better
Requires iOS17.012.0 — better
Further details — not scored
Size16 MB8 MB
Age rating4+4+
DeveloperBjorn Freeman-BensonKei Suefuji

Customer experience

Emerald Observatory for iPad

All ratings84 ratings
Positive97.6%
Neutral1.2%
Negative1.2%
Written reviews145 reviews
Positive98.6%
Neutral0.0%
Negative1.4%

Digital LED Clock

All ratings2 ratings
Positive50.0%
Neutral0.0%
Negative50.0%
Written reviews2 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

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
Show 9 more
  • 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

None

Emerald Observatory for iPad

No in-app purchases

None

Digital LED Clock

No in-app purchases

Questions

Is Emerald Observatory for iPad free?
Emerald Observatory for iPad is free to download, with no in-app purchases.
Is Digital LED Clock free?
Digital LED Clock costs $1.99, with no in-app purchases.
Which has better reviews, Emerald Observatory for iPad or Digital LED Clock?
Emerald Observatory for iPad is rated higher. Emerald Observatory for iPad averages 4.9 out of 5 from 95 ratings, while Digital LED Clock averages 3.0 from 2 ratings.
Do Emerald Observatory for iPad or Digital LED Clock have ads?
Neither Emerald Observatory for iPad nor Digital LED Clock shows ads.
Which is updated more often, Emerald Observatory for iPad or Digital LED Clock?
Emerald Observatory for iPad ships an update every 5 months, and Digital LED Clock every 40 months. Most recently, Emerald Observatory for iPad was updated on October 22, 2026 and Digital LED Clock on October 19, 2026.

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