Astro App is described as 'The Astro App is a tool for exploring the night sky and tracking celestial events. It's primarily targeted for amateur astrophotographers' and is an website in the education & reference category. There are six alternatives to Astro App, not only websites but also apps for Windows, Linux, Mac, Flathub and Flatpak. The best Astro App alternative is Siril, which is both free and Open Source. Other great sites and apps similar to Astro App are DeepSkyStacker, FITS Liberator, SAOImageDS9 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.
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.
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.
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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