# AstroAid vs Open Planetarium

The clearest difference is price: Open Planetarium at Free against AstroAid's $2.99. AstroAid's advantage is iOS requirement (10.0 vs 13.0). On ads, in-app purchases and device support there is nothing between them.

Open Planetarium is free to download; AstroAid costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | AstroAid | Open Planetarium |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[4.3 (44 ratings)](https://appshunter.io/ios/app/astroaid/id541448395/reviews)** | — |
| Number of ratings | **44** | — |
| Positive reviews | 71.1% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Fortnightly | — |
| Monetization | Free | — |
| Size | 125 MB | 26 MB |
| Requires iOS | **10.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [iLanga, Inc.](https://appshunter.io/developer/541448398) | [CatsAI Agency](https://appshunter.io/developer/6799471013) |

## What reviewers say

### AstroAid

[App page](https://appshunter.io/ios/app/astroaid/id541448395)

Visualize what you'll see through your telescope with different eyepieces and optical aids. Plan your astrophotography by pairing cameras with telescopes to see what fits in the frame. Includes astronomical catalogs and equipment lists.

**Highlights:** Telescope/eyepiece/imager field of view simulation, Magnification and visual magnitude limit calculation, Built-in astronomical object catalogs (Messier, NGC, IC), Searchable object catalogs with downloadable images, Extensive equipment lists with custom entry support, iCloud synchronization for custom equipment

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

**In-app purchases:** none

**What reviewers like**

- 👍 Excellent for planning and framing
- 👍 Useful for calculating image scale
- 👍 Good for visual and astrophotography planning
- 👍 Accurate and easy to use
- 👍 Great value for money

**What reviewers complain about**

- 🐛 App doesn't open/crashes
- 👎 Outdated equipment database
- 👎 Small image previews
- 👎 Images are often cropped
- 👎 Lacks planetary data

**Reported bugs**

- App doesn't open
- App crashes on opening (iOS 14.2)
- App crashes after update (12.1)
- Crashes when adding new scope
- Keeps quitting when making custom eyepieces

**Requested features**

- Update equipment database (cameras, scopes, sensors)
- Include planets in object database
- Allow image rotation
- Provide un-cropped images (optional)
- Add solar system images (Sun, Moon, planets)


### Open Planetarium

[App page](https://appshunter.io/ios/app/open-planetarium/id6799616519)

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

**In-app purchases:** none


## Frequently asked questions

### Is AstroAid free?

AstroAid costs $2.99, with no in-app purchases.

### Is Open Planetarium free?

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

### Do AstroAid or Open Planetarium have ads?

Neither AstroAid nor Open Planetarium 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.*