Astroart is described as 'Software for image processing, image analysis, astrometry, photometry, camera and telescope control' and is an app. There are three alternatives to Astroart for Windows, Linux, Mac, Flathub and Flatpak. The best Astroart alternative is Siril, which is both free and Open Source. Other great apps like Astroart are DeepSkyStacker and PixInsight.
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.
DeepSkyStacker is a freeware for astrophotographers that simplifies all the pre-processing steps of deep sky pictures.
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.
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