# Emerald Observatory for iPad vs iOptron Commander (iOS)

The clearest difference is review sentiment: Emerald Observatory for iPad at 99% against iOptron Commander (iOS)'s 6%. Emerald Observatory for iPad also leads on rating (4.9 vs 1.8) and ratings volume (102 vs 15). iOptron Commander (iOS)'s advantage is monetization model (free vs paid). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. 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 1.8. That said, the two scores are not equally well evidenced: Emerald Observatory for iPad has 102 ratings behind it against 15, 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 6% of iOptron Commander (iOS)'s.

Emerald Observatory for iPad ships an update every 4 months, iOptron Commander (iOS) every 6 months. The most recent releases landed on November 10, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Emerald Observatory for iPad | iOptron Commander (iOS) |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (102 ratings)](https://appshunter.io/ios/app/emerald-observatory-for-ipad/id364904759/reviews)** | [1.8 (15 ratings)](https://appshunter.io/ios/app/ioptron-commander-ios/id1626958667/reviews) |
| Number of ratings | **102** | 15 |
| Positive reviews | **98.7% of reviews** | 6.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 6 months |
| Monetization | Paid | **Free** |
| Size | 41 MB | 24 MB |
| Requires iOS | **17.0** | 18.6 |
| Devices | iPad | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Bjorn Freeman-Benson](https://appshunter.io/developer/1766829089) | [成城 徐](https://appshunter.io/developer/564078964) |

## What reviewers say

### Emerald Observatory for iPad

[App page](https://appshunter.io/ios/app/emerald-observatory-for-ipad/id364904759)

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:** macOS Compatibility, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- ✨ Visually stunning and beautiful design
- 💡 Extremely informative and data-rich
- 👍 Elegant and exquisite user interface
- 🚀 Flawless UX and intuitive design
- 🌟 Unique and nonpareil functionality

**What reviewers complain about**

- ⏳ Last update a year ago
- 🤔 Interface can be tough to decipher initially
- 🔄 Lack of recent updates
- 📱 Not available on iPhone/Apple Watch

**Requested features**

- Port to screen wallpaper
- Large wall clock version
- Apple TV version
- Support for Uranus, Neptune, and Pluto
- iPhone and Apple Watch versions


### iOptron Commander (iOS)

[App page](https://appshunter.io/ios/app/ioptron-commander-ios/id1626958667)

Control your iOptron telescope mount remotely using your iOS device. This utility allows for basic functions like slewing to celestial objects, syncing time and location, and managing compatible mount series.

**Highlights:** Remote telescope mount control, Slew to stars and deepsky objects, Sync time and site from iOS, Supports HEM, HAE, HAZ, CEM, GEM series mounts, Basic control functions

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Emerald Observatory for iPad free?

Emerald Observatory for iPad is free to download, with no in-app purchases.

### Is iOptron Commander (iOS) free?

iOptron Commander (iOS) is free to download, with no in-app purchases.

### Which has better reviews, Emerald Observatory for iPad or iOptron Commander (iOS)?

Emerald Observatory for iPad is rated higher. Emerald Observatory for iPad averages 4.9 out of 5 from 102 ratings, while iOptron Commander (iOS) averages 1.8 from 15 ratings.

### Do Emerald Observatory for iPad or iOptron Commander (iOS) have ads?

Neither Emerald Observatory for iPad nor iOptron Commander (iOS) shows ads.

### Which is updated more often, Emerald Observatory for iPad or iOptron Commander (iOS)?

Emerald Observatory for iPad ships an update every 4 months, and iOptron Commander (iOS) every 6 months. Most recently, Emerald Observatory for iPad was updated on November 10, 2026 and iOptron Commander (iOS) on November 3, 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.*