FITS Preview 4+

CloudMakers, s. r. o.

    • 3.3 • 6 Ratings
    • $5.99



FITS Preview is a lightweight and fast viewer for images in FITS format (Flexible Image Transport System) introduced by NASA and HEASARC.

The viewer is based on CFITSIO library and supports all standard monochromatic and color FITS image formats. It shows both an image (zoomed and stretched automatically, but manual correction of black and white point is available), an image metadata and histogram. The viewer can flip, rotate, debayer image and export images to JPEG format.

In addition to FITS format it supports also XISF (introduced by PixInsight) and INDIGO Raw (introduced by INDIGO Initiative).

What’s New

Version 4.12

INDIGO framework version 2.0.258.

Ratings and Reviews

3.3 out of 5
6 Ratings

6 Ratings

Mr. Penguinlicious ,

Can't view FITS from the Finder

You have to open the FITS file in the app to view it. It has sliders to adjust the histogram, you can zoom in/out, etc. But if you are looking for a way to quickly view FITS images in the Finder just by hitting the spacebar, then look elsewhere (e.g., QuickFITS).

Grimstod ,

Fast and makes Astrophotorgraphy sorting easier

It now allows you to zoom in quite far. 400% and I can now see indavidual pixels. Makes sorting and viewwing images out of my ZWO much faster. All the data that it gives you in the info pain is also especially helpful. I really love having the ability to change bayer patterns too.

I just am adding this. So the info section gives you the location that the mount was in. This is really helpful becuase you can then return to a custum composition on another night to capture more data. Very helpfull.

The developer is also very responsive through email and suport.

spratdog ,

Views FITS files, nothing more.

It does in fact display my FITS images. It does not zoom past 100% to see individual pixels clearly. It does have black & white point sliders, small sliders, with no histogram for reference or numeric values. It does not have any value pickers or magnifying glass allowing me to get the original value from any particular pixel.

App Privacy

The developer, CloudMakers, s. r. o., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

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