Astrolabe Clock vs Sky Time
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Astrolabe Clock
This app offers a modern interpretation of an ancient astronomical instrument, providing a real-time view of the sky. It displays the time of day, day of the year, and the positions of celestial bodies like the Sun, Moon, planets, and stars. Users can also track sunrise/sunset times, moon phases, and celestial transits.
- Real-time sky view
- Time of day and day of year display
- Sun, Moon, planet, and star locations
- Sunrise and sunset times
- Moon phase tracking
- Celestial transit times
- Eclipse occurrence indicator
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Astrolabe Clock is an astronomical clock inspired by the astrolabe, an ancient astronomical instrument used to tell time and to predict the location of the Sun, stars and planets. This modern interpretation gives a view of the sky showing at a glance the time of day, day of year, and the location in the sky of the Sun, Moon, planets and stars. Astrolabe Clock also gives the time of sunrise and sunset, the phase of the Moon, transit times for the Sun, Moon, planets and stars, and can be used to show the occurrence of solar and lunar eclipses.
Sky Time
This app provides essential astronomy-related time data, including Julian Date, Universal Time, and Sidereal Time calculated using your device's location. It features a night-vision friendly red display and pop-up descriptions for easy understanding.
- Displays local, Julian, Local Sidereal, and Universal Time
- Calculates Sidereal Time using device location
- Night-vision friendly red display
- Pop-up descriptions for time data
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Sky Time is a simple app that displays Astronomy related times, including Julian Date and Universal Time. It also makes use of your device's ability to sense location to determine the Sidereal Time. Sky Time is a useful tool to have to hand when setting up your telescope! * Displays local, Julian, Local Sidereal and Universal Time. * Night-vision friendly red display. * Pop-up descriptions of the times at your fingertips.
Screenshots
Verdict
The clearest difference is rating: Astrolabe Clock at 4.7 against Sky Time's 4.2. Astrolabe Clock also leads on review sentiment (91% vs 60%). Sky Time's advantage is iOS requirement (10.0 vs 15.6). On price, ratings volume, update cadence and ads 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. Neither carries in-app purchases, so what you see is what you pay.
Astrolabe Clock holds the better App Store score, 4.7 against 4.2. Both are backed by a comparable volume of ratings — 48 and 17 respectively. Written reviews point the same way: 91% of Astrolabe Clock's written reviews are positive against 60% of Sky Time's.
Astrolabe Clock ships an update every 4 weeks, Sky Time every 2 months. The most recent releases landed on September 15, 2026 and September 21, 2026 respectively.
| Parameter | Astrolabe Clock | Sky Time |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (48 ratings) — better | 4.2 (17 ratings) |
| Positive reviews | 90.9% of reviews — better | 60.0% of reviews |
| Number of ratings | 48 — better | 17 |
| Update frequency | Every 4 weeks — better | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod, Apple Watch — better |
| Requires iOS | 15.6 | 10.0 — better |
| Further details — not scored | ||
| Size | 3 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Michael Smith | John Kennedy |
Customer experience
Astrolabe Clock
Sky Time
In-app purchases
Astrolabe Clock
No in-app purchases
Sky Time
No in-app purchases
