# Mag Galaxy — Surface brightness galaxy

> Surface brightness galaxy (iPhone/iPad app by Claude Duplessis.)

- Source: https://appshunter.io/ios/app/mag-galaxy/id1618628375 (this page in markdown: same URL + `.md`)
- Developer: [Claude Duplessis](https://appshunter.io/developer/1591450006)
- Category: Education, Utilities
- Price: Free
- Age rating: 17+
- Requires: iOS 13.1 · 3 MB
- Languages: English, French, Spanish
- Released: 2022-04-10
- Data updated: 2026-05-15
- User reviews in markdown: https://appshunter.io/ios/app/mag-galaxy/id1618628375/reviews.md

## What is Mag Galaxy?

The observation of galaxies with a telescope offers a level of difficulty in knowing their brilliance in the sky. The visual magnitude gives the brightness information as if the galaxy were a star in the sky. The surface magnitude distributes this brightness over the entire surface of the galaxy, offering a clue to the level of difficulty of its observation.

Mag Galaxy transforms visual magnitude into areal magnitude for your galaxy observations.


## Version history (last 3 releases)

### 1.2 — 2023-08-16

Fix for comma versus period on some keyboard depending on region for Visual Magnitude input field.

### 1.1 — 2022-04-12

Added value in arc seconds.

### 1.0 — 2022-04-10

No release notes.

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## More apps by Claude Duplessis

- [Lunar X](https://appshunter.io/ios/app/lunar-x/id1591450004)

All apps by Claude Duplessis: https://appshunter.io/developer/1591450006

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-05-15.*