# Cosmic Deepsky vs Messier Journal

The clearest difference is update cadence: Messier Journal at every 3 months against Cosmic Deepsky's every 23 months. Messier Journal also leads on price ($0.99 vs $2.99). Cosmic Deepsky's advantage is iOS requirement (15.0 vs 18.0). On rating, review sentiment, ratings volume and ads there is nothing between them.

Cosmic Deepsky costs $2.99 and Messier Journal $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for Cosmic Deepsky against 5.0 for Messier Journal. Both are backed by a comparable volume of ratings — 4 and 3 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

Cosmic Deepsky ships an update every 23 months, Messier Journal every 3 months. The most recent releases landed on October 13, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Cosmic Deepsky | Messier Journal |
| --- | --- | --- |
| Price | $2.99 | **$0.99** |
| Rating | [5.0 (4 ratings)](https://appshunter.io/ios/app/cosmic-deepsky/id6444288149/reviews) | [5.0 (3 ratings)](https://appshunter.io/ios/app/messier-journal/id6753959873/reviews) |
| Number of ratings | **4** | 3 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 23 months | **Every 3 months** |
| Monetization | Paid | Paid |
| Size | 114 MB | 158 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Celestial Dynamics AG](https://appshunter.io/developer/997250789) | [Damon Degner](https://appshunter.io/developer/1845946345) |

## What reviewers say

### Cosmic Deepsky

[App page](https://appshunter.io/ios/app/cosmic-deepsky/id6444288149)

Explore the universe with a virtual telescope. Discover galaxies, star clusters, and nebulae with stunning real images and detailed information. A pocket guide to the cosmos.

**Highlights:** Virtual telescope functionality, Detailed information on 4000+ galaxies, Real astro-photographs of celestial objects, Hand-measured and oriented images, Exploration of deep sky objects, Information on star clusters and nebulae

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

**In-app purchases:** none


### Messier Journal

[App page](https://appshunter.io/ios/app/messier-journal/id6753959873)

This app helps Northern Hemisphere astronomers and astrophotographers discover, locate, and journal all 110 Messier objects. It provides detailed information, star maps, and tools to record observations and upload photos.

**Highlights:** Learn about 110 Messier objects, Locate objects with star maps, Filter objects by constellation and type, Record observation details, Upload astrophotography, Track spotted object statistics, Generate object collages

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

**In-app purchases:** none


## Frequently asked questions

### Is Cosmic Deepsky free?

Cosmic Deepsky costs $2.99, with no in-app purchases.

### Is Messier Journal free?

Messier Journal costs $0.99, with no in-app purchases.

### Which has better reviews, Cosmic Deepsky or Messier Journal?

Cosmic Deepsky and Messier Journal are both rated 5.0 out of 5 on the App Store, from 4 and 3 ratings respectively.

### Do Cosmic Deepsky or Messier Journal have ads?

Neither Cosmic Deepsky nor Messier Journal shows ads.

### Which is updated more often, Cosmic Deepsky or Messier Journal?

Cosmic Deepsky ships an update every 23 months, and Messier Journal every 3 months. Most recently, Cosmic Deepsky was updated on October 13, 2026 and Messier Journal on October 2, 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.*