# GPS Astro vs iOptron iPolar Mobile

The clearest difference is review sentiment: GPS Astro at 83% against iOptron iPolar Mobile's 0%. GPS Astro also leads on rating (4.8 vs 2.0) and monetization model (free vs paid). On price, ads, in-app purchases and device support there is nothing between them.

GPS Astro costs $0.99 and iOptron iPolar Mobile $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

GPS Astro holds the better App Store score, 4.8 against 2.0. That said, the two scores are not equally well evidenced: GPS Astro has 122 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 83% of GPS Astro's written reviews are positive against 0% of iOptron iPolar Mobile's.

## The numbers

| Metric | GPS Astro | iOptron iPolar Mobile |
| --- | --- | --- |
| Price | $0.99 | $0.99 |
| Rating | **[4.8 (122 ratings)](https://appshunter.io/ios/app/gps-astro/id369884042/reviews)** | [2.0 (4 ratings)](https://appshunter.io/ios/app/ioptron-ipolar-mobile/id6470996795/reviews) |
| Number of ratings | **122** | 4 |
| Positive reviews | **83.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | — |
| Monetization | **Free** | Paid |
| Size | 54 MB | 1 MB |
| Requires iOS | **9.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Esirion AG](https://appshunter.io/developer/369884045) | [成城 徐](https://appshunter.io/developer/564078964) |

## What reviewers say

### GPS Astro

[App page](https://appshunter.io/ios/app/gps-astro/id369884042)

This utility app calculates astronomical events like sunrise, sunset, moonrise, and moonset. It supports current or selected locations and displays moon phases and twilight times. Users can save multiple locations and sync events to their calendar.

**Highlights:** Sunrise/sunset times, Moonrise/moonset times, Moon phases, Twilight times, Save multiple locations, Calendar sync

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

**In-app purchases:** none

**What reviewers like**

- 👍 Simple to use
- 📖 Clear to read
- 💰 Affordable price
- 🎣 Useful for planning outings
- ✅ Reliable and accurate

**What reviewers complain about**

- 🐛 Moon times inaccurate
- 🐛 Language not changeable
- 🔒 Location access required when not running
- 📉 Graphical moon phase approximation

**Reported bugs**

- 🐛 Moon rise/set times off by an hour
- 🐛 Cannot change language from German to English
- 🐛 Cannot change location in iOS 10
- 🐛 Requires location access even when app is not running
- 🐛 Moon phases rendered approximately, not true representation

**Requested features**

- 💡 More accurate moon rendering
- 💡 Monthly/yearly view
- 💡 Improved interface for dates and locations
- 💡 True moon phase representation


### iOptron iPolar Mobile

[App page](https://appshunter.io/ios/app/ioptron-ipolar-mobile/id6470996795)

This utility app assists users in polar aligning their telescope mounts quickly and efficiently. It connects to a specific portable computer and camera for optimal results.

**Highlights:** Polar alignment assistance, Connects to iPolar camera, Works with iMate portable computer, Quick alignment method, Telescope mount optimization

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

**In-app purchases:** none


## Frequently asked questions

### Is GPS Astro free?

GPS Astro costs $0.99, with no in-app purchases.

### Is iOptron iPolar Mobile free?

iOptron iPolar Mobile costs $0.99, with no in-app purchases.

### Which has better reviews, GPS Astro or iOptron iPolar Mobile?

GPS Astro is rated higher. GPS Astro averages 4.8 out of 5 from 122 ratings, while iOptron iPolar Mobile averages 2.0 from 4 ratings.

### Do GPS Astro or iOptron iPolar Mobile have ads?

Neither GPS Astro nor iOptron iPolar Mobile shows ads.

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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.*