SunGraph vs Sky Time
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SunGraph
Calculate sunrise and sunset times for any location globally and any day of the year. Explore earliest/latest times, the equation of time, and sun inclination. Visualize the sun's position on Earth.
- Sunrise and sunset times worldwide
- Earliest and latest sunrise/sunset
- Equation of time display
- Sun inclination at transit
- World view of sun's position
- User location database
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SunGraph is a sunrise and sunset calculator showing sunrise and sunset times for anywhere in the world and for any day of the year. For any latitude the earliest and latest sunrise and sunset times will be displayed. The analemma screen displays the equation of time along with the inclination of the sun above the horizon at transit. A world view shows the location of the sun on the Earth for the current time, or any day of the year. A data base can store user locations.
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: Sky Time at 4.2 against SunGraph's 3.1. Sky Time also leads on update cadence (every 2 months vs every 4 months) and iOS requirement (10.0 vs 13.0). On price, review sentiment, ratings volume 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.
Sky Time holds the better App Store score, 4.2 against 3.1. Both are backed by a comparable volume of ratings — 12 and 17 respectively. Written reviews point the same way: 57% of SunGraph's written reviews are positive against 60% of Sky Time's.
SunGraph ships an update every 4 months, Sky Time every 2 months. The most recent releases landed on September 28, 2026 and October 6, 2026 respectively.
| Parameter | SunGraph | Sky Time |
|---|---|---|
| Price | Free | Free |
| Rating | 3.1 (12 ratings) | 4.2 (17 ratings) — better |
| Positive reviews | 56.8% of reviews | 60.0% of reviews — better |
| Number of ratings | 12 | 17 — better |
| Update frequency | Every 4 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod, Mac | iPhone, iPad, iPod, Apple Watch |
| Requires iOS | 13.0 | 10.0 — better |
| Further details — not scored | ||
| Size | 11 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Tremont Air, LLC | John Kennedy |
Customer experience
SunGraph
Sky Time
In-app purchases
SunGraph
No in-app purchases
Sky Time
No in-app purchases
