IRIS Astronomical Images Alternatives

Apps similar to IRIS Astronomical Images include Siril, which is free and open source. Other options are DeepSkyStacker, FITS Liberator, SAOImageDS9 and Regim. You can choose from more than 10 apps like IRIS Astronomical Images for Windows, Linux, Mac and the web.

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IRIS Astronomical Images alternatives page was last updated Aug 25, 2026

Siril
4 likes
Siril is an astronomical image processing tool, able to convert, pre-process images, help aligning them automatically or manually, stack them and enhance final images.
Cost / License
Free
Open Source (GPL-3.0)
Platforms
Mac
Windows
Linux
Flathub
Flatpak
Good alternative?Is Siril a good alternative to IRIS Astronomical Images?
DeepSkyStacker
9 likes
DeepSkyStacker is a freeware for astrophotographers that simplifies all the pre-processing steps of deep sky pictures.
13 DeepSkyStacker alternatives
Cost / License
Free
Proprietary
Platforms
Windows
Good alternative?Is DeepSkyStacker a good alternative to IRIS Astronomical Images?
FITS Liberator
2 likes
FITS Liberator GUI image processing software has meant that it is even easier and faster to create color images using raw observations from a range of telescopes.
Cost / License
Free
Open Source
Origin
United States
Platforms
Mac
Windows
Linux
United States
Good alternative?Is FITS Liberator a good alternative to IRIS Astronomical Images?
SAOImageDS9
1 like
SAOImageDS9 is an astronomical imaging and data visualization application. DS9 supports FITS images and binary tables, multiple frame buffers, region manipulation, and many scale algorithms and colormaps.
Cost / License
Free
Open Source (GPL-3.0)
Platforms
Mac
Windows
Linux
+2
Good alternative?Is SAOImageDS9 a good alternative to IRIS Astronomical Images?
R
R
Regim
1 like
Regim makes some processing steps that are unique to astronomical images a bit easier. These steps are calibration (dark and flat), deblooming, registration, combination, color calibration, gradient removal and some more.
Cost / License
Free
Proprietary
Platforms
Mac
Windows
Linux
R
Good alternative?Is Regim a good alternative to IRIS Astronomical Images?
PixInsight
1 like
PixInsight is an advanced image processing platform specialized in astrophotography and other technical imaging fields, constantly pushing the boundaries of astronomical image processing with the most powerful toolset available.
9 PixInsight alternatives
Cost / License
Paid
Proprietary
Origin
Spain
EU
Platforms
Linux
Mac
Windows
Spain
EU
Good alternative?Is PixInsight a good alternative to IRIS Astronomical Images?
Fitswork
Like
Fitswork is a windows image processing program, mainly designed for astronomic purposes. It contains batch processing, histogram functions, many filters, etc. Fitswork works entirely in floating-point arithmetic.
Cost / License
Free
Proprietary
Platforms
Windows
Good alternative?Is Fitswork a good alternative to IRIS Astronomical Images?
Q
Q
Qastrocam
Like
Qastrocam is a capture program to do astrophotography. It can control a telescope to do guiding with the images received from a V4L device. It can also control the extended features of a webcam modified to do long exposure (several seconds) captures.
Cost / License
Free
Open Source
Platforms
Linux
Q
Good alternative?Is Qastrocam a good alternative to IRIS Astronomical Images?
Astro App
Like
The Astro App is a tool for exploring the night sky and tracking celestial events. It's primarily targeted for amateur astrophotographers.
Cost / License
Free
Proprietary
Platforms
Online
+4
Good alternative?Is Astro App a good alternative to IRIS Astronomical Images?
A
A
Astraios
Like
Professional GPU-accelerated astrophotography image processing. Free, open-source alternative to PixInsight.
Cost / License
Free
Open Source (AGPL-3.0)
Platforms
Mac
Windows
Linux
A
Good alternative?Is Astraios a good alternative to IRIS Astronomical Images?