Apps similar to PreviewQt include Preview, which is free. Other options are Kiview and GNOME Sushi. In total there are three Image Viewers like PreviewQt for Linux, Mac, iPhone and iPad.
Native macOS app for viewing, annotating, and editing images and PDFs, featuring tools for cropping, rotating, resizing images, rearranging pages, full-screen viewing, markup, document merging, batch conversion, and export in multiple formats.
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Kiview gives the user the ability to quickly preview different file types without the need to launch the default application.
GNOME sushi is a file previewer for the GNOME desktop environment. It is available as a standalone package that integrates with GNOME Files (formerly named Nautilus).
