Great App for Astrphotographers
This is an app that I've been waiting for. Gives the ability to open and edit astro image files in the professional FITS format. Very fast with great editing tools.
Response from developer
🙏🏻👍🏻
Free
About
View astronomical image files like FITS and XISF on your iPhone or iPad. Get an early impression of your data with PixInsight-compatible auto-stretching, gradient control, and noise reduction. Fun and useful for astrophotographers.
✓Open FITS and XISF files from various sources
✓PixInsight-compatible STF auto-stretch
✓Mono and RGB image support with OSC debayer
✓Dark point and contrast sliders
✓Color saturation adjustment
✓GPU bilateral denoise
✓Gradient correction
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What's New in AstroFileViewer
1.5.0
May 3, 2026
Now with TIFF Support
User reviews
Developer apps
FAQ
What file formats does AstroFileViewer support?
AstroFileViewer supports FITS and XISF files, which are common formats in astrophotography. It can also handle compressed versions like LZ4, zlib, and zstd.
Does AstroFileViewer have ads?
No, AstroFileViewer does not contain advertisements. It is a completely free application designed for astrophotographers.
Can I edit my astronomical images with AstroFileViewer?
Yes, AstroFileViewer offers several editing features. You can adjust dark point, contrast, and color saturation, as well as apply GPU-accelerated denoising and gradient correction.
What devices is AstroFileViewer compatible with?
AstroFileViewer is designed for Apple devices and is compatible with both iPhone and iPad.
How does AstroFileViewer handle image stretching?
It uses a PixInsight-compatible Screen Transfer Function (STF) auto-stretch to properly visualize linear astronomical data, making faint details visible.
Is AstroFileViewer suitable for beginners in astrophotography?
While built by an astrophotographer, the app's features like auto-stretch and gradient correction can be very helpful for beginners to quickly assess their data quality.
How often is AstroFileViewer updated?
The latest version, 1.5.0, was released on May 3, 2026, indicating recent development activity. Updates typically bring new features and improvements.
Can I save my processed images from AstroFileViewer?
Yes, you can save your adjusted images as stretched JPEGs directly to your Photos app, with all your applied adjustments baked in.