# SkyAtlas vs Catálogo Messier

The clearest difference is in-app purchases: SkyAtlas at none against Catálogo Messier's 1. SkyAtlas also leads on update cadence (monthly vs every 7 months) and iOS requirement (11.0 vs 15.6). On price, ads and device support there is nothing between them.

Both are free to download. Catálogo Messier sells 1 one-off in-app purchase. SkyAtlas asks for nothing beyond the download.

SkyAtlas ships an update monthly, Catálogo Messier every 7 months. The most recent releases landed on November 3, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | SkyAtlas | Catálogo Messier |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.4 (17 ratings)](https://appshunter.io/ios/app/skyatlas/id1616449238/reviews)** | — |
| Number of ratings | **17** | — |
| Positive reviews | 40.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Monthly** | Every 7 months |
| Monetization | Free | — |
| Size | 911 MB | 19 MB |
| Requires iOS | **11.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [SuZhou ZWO Co., Ltd](https://appshunter.io/developer/1367782033) | [Pablo Morcillo Perez](https://appshunter.io/developer/922855490) |

## What reviewers say

### SkyAtlas

[App page](https://appshunter.io/ios/app/skyatlas/id1616449238)

Explore the night sky with a digital atlas and control your telescope mount. Plan astrophotography compositions with simulated camera fields of view and track celestial objects in real-time. Features one-click GoTo and mode switching for an enhanced stargazing experience.

**Highlights:** Digital sky atlas exploration, Telescope mount control (ZWO ASI), Simulated camera field of view, Real-time telescope pointing display, One-click GoTo functionality, Object tracking, EQ and AltAz mode switching

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

**In-app purchases:** none


### Catálogo Messier

[App page](https://appshunter.io/ios/app/catalogo-messier/id6443842540)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Messier Catalogue Pro | $2.99 | one-time |


## Frequently asked questions

### Is SkyAtlas free?

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

### Is Catálogo Messier free?

Catálogo Messier is free to download, with in-app purchases available.

### Do SkyAtlas or Catálogo Messier have ads?

Neither SkyAtlas nor Catálogo Messier shows ads.

### Which is updated more often, SkyAtlas or Catálogo Messier?

SkyAtlas ships an update monthly, and Catálogo Messier every 7 months. Most recently, SkyAtlas was updated on November 3, 2026 and Catálogo Messier on November 7, 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.*