# SunGraph vs Astrolabe Clock

The clearest difference is rating: Astrolabe Clock at 4.7 against SunGraph's 3.1. Astrolabe Clock also leads on review sentiment (91% vs 57%) and update cadence (every 4 weeks vs every 4 months). SunGraph's advantage is iOS requirement (13.0 vs 15.6). On price, ads, in-app purchases and monetization model there is nothing between them.

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 3.1. Both are backed by a comparable volume of ratings — 12 and 48 respectively. Written reviews point the same way: 57% of SunGraph's written reviews are positive against 91% of Astrolabe Clock's.

SunGraph ships an update every 4 months, Astrolabe Clock every 4 weeks. The most recent releases landed on September 18, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | SunGraph | Astrolabe Clock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.1 (12 ratings)](https://appshunter.io/ios/app/sungraph/id321534034/reviews) | **[4.7 (48 ratings)](https://appshunter.io/ios/app/astrolabe-clock/id421777015/reviews)** |
| Number of ratings | 12 | **48** |
| Positive reviews | 56.8% of reviews | **90.9% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 4 weeks** |
| Monetization | Free | Free |
| Size | 11 MB | 3 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Tremont Air, LLC](https://appshunter.io/developer/309321587) | [Michael Smith](https://appshunter.io/developer/415384088) |

## What reviewers say

### SunGraph

[App page](https://appshunter.io/ios/app/sungraph/id321534034)

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.

**Highlights:** 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

**In-app purchases:** none


### Astrolabe Clock

[App page](https://appshunter.io/ios/app/astrolabe-clock/id421777015)

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.

**Highlights:** 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

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SunGraph free?

SunGraph is free to download, with no in-app purchases.

### Is Astrolabe Clock free?

Astrolabe Clock is free to download, with no in-app purchases.

### Which has better reviews, SunGraph or Astrolabe Clock?

Astrolabe Clock is rated higher. SunGraph averages 3.1 out of 5 from 12 ratings, while Astrolabe Clock averages 4.7 from 48 ratings.

### Do SunGraph or Astrolabe Clock have ads?

Neither SunGraph nor Astrolabe Clock shows ads.

### Which is updated more often, SunGraph or Astrolabe Clock?

SunGraph ships an update every 4 months, and Astrolabe Clock every 4 weeks. Most recently, SunGraph was updated on September 18, 2026 and Astrolabe Clock on September 15, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*