# AstroPup View — Astronomical Image Viewer

> View and manage FITS and XISF astronomical image files with advanced features. (iPhone/iPad app by Aaron Freimark.)

- Source: https://appshunter.io/ios/app/astropup-view/id6752028730 (this page in markdown: same URL + `.md`)
- Developer: [Aaron Freimark](https://appshunter.io/developer/1533614349)
- Category: Utilities
- Price: Free (on sale, was $0.99)
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 18.0 · 21 MB
- Languages: English, French, German, Japanese, Spanish
- Released: 2025-09-05
- Data updated: 2026-07-03
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/astropup-view/id6752028730/reviews.md

## What is AstroPup View?

Astrophotography images traditionally use an obscure raw image format called FITS, and a newer format called XISF. AstroPup View is designed to manage these files as easily as JPEGs: through Finder integration and viewer support.

* XISF and FITS format support
* GPU-accelerated rendering
* Automatic advanced stretching
* QuickLook integration
* Icon creation
* Smart metadata display

## Key features

- FITS and XISF format support
- GPU-accelerated rendering
- Automatic advanced stretching
- QuickLook integration
- Icon creation
- Smart metadata display


## Frequently asked questions about AstroPup View

### What image formats does AstroPup View support?

AstroPup View specifically supports the FITS and XISF formats, which are commonly used in astrophotography. This allows you to manage these specialized files as easily as standard image formats.

### Is AstroPup View free to use?

Yes, AstroPup View is completely free to download and use. There are no hidden costs or in-app purchases required to access its full functionality.

### Does AstroPup View have ads?

No, AstroPup View is ad-free. You can enjoy a clean and uninterrupted viewing experience without any advertisements.

### What devices is AstroPup View available on?

AstroPup View is available on Mac, iPhone, and iPad, offering a consistent experience across Apple devices. This broad compatibility ensures you can manage your astronomical images wherever you work.

### How often is AstroPup View updated?

The latest version, 1.7, was released on June 12, 2026. While specific update frequency isn't detailed, the developer actively maintains the application.

### What is the age rating for AstroPup View?

AstroPup View has an age rating of 4+, making it suitable for users of all ages. This indicates it contains no mature content.

### What makes AstroPup View's rendering special?

AstroPup View utilizes GPU-accelerated rendering for faster and smoother image display. It also features automatic advanced stretching to enhance the visibility of details in your astronomical images.

## Version history (last 5 releases)

### 1.7 — 2026-06-12

- We make better choices to stretch or not
- In-app documentation
- In-app release notes
- Send me feedback!

### 1.5 — 2026-05-14

The app shows with a shorter name in iOS.
UI cleanups under the hood.

### 1.4 — 2026-05-01

- Loading large files is dramatically faster
- Star chart is now target-centered
- Sidebar shows field rotation
- Click RA or Dec to toggle between sexagesimal and decimal degrees
- Stretch behavior more closely matches PixInsight's 
- Many internal cleanups
- Introducing our new app AstroPup Plan

### 1.3.2 — 2025-10-10

- Improved detection when RGB XISF files need a stretch

### 1.3 — 2025-09-29

- Much quicker loading in full resolution, so removed the option to downsample
- Language support for Spanish, German, French, Japanese, and Hungarian, in addition to English (let me know if translations can be improved!)

## Apps similar to AstroPup View

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Cygnus Astro](https://appshunter.io/ios/app/cygnus-astro/id6745795760) | 4.5 (2) | Free | Utilities |
| [Touch-N-Stars](https://appshunter.io/ios/app/touch-n-stars/id6744902856) | 5.0 (6) | Free | Utilities |
| [Folder (hidden data)](https://appshunter.io/ios/app/folder-hidden-data/id1555143299) | — | Free | Utilities |
| [Colorgetter](https://appshunter.io/ios/app/colorgetter/id6747144752) | — | Free | Utilities |
| [MLAstro Hub](https://appshunter.io/ios/app/mlastro-hub/id6767999378) | — | Free | Utilities |
| [iOptron iPolar Mobile](https://appshunter.io/ios/app/ioptron-ipolar-mobile/id6470996795) | 2.0 (2) | $0.99 | Utilities |

## More apps by Aaron Freimark

- [INDIGO to GO](https://appshunter.io/ios/app/indigo-to-go/id1533616268)
- [AstroPup Horizon](https://appshunter.io/ios/app/astropup-horizon/id6753884236)
- [AstroPup Sky](https://appshunter.io/ios/app/astropup-sky/id6764730162)

All apps by Aaron Freimark: https://appshunter.io/developer/1533614349

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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 2026-07-03.*