Upscayl is described as 'Free and Open Source AI Image Upscaler for Linux, MacOS and Windows built with Linux-First philosophy' and is a very popular Image Upscaling app in the photos & graphics category. There are more than 50 alternatives to Upscayl for a variety of platforms, including Windows, Web-based, Mac, Linux and Android apps. The best Upscayl alternative is waifu2x, which is both free and Open Source. Other great apps like Upscayl are Topaz Gigapixel, REAL Video Enhancer, Video2X and Real-ESRGAN.
Upscayl alternatives are mainly Image Upscaling Apps, but if you're looking for
Image Editors or Video Upscaling Apps you can filter on that. Other popular filters include
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Im2Go offers a lot of possibilities : we can re-size our image , and make it a 1200 DPI, we can u do many many other things... Personally I use it to only re-size my images without any enhancement, but no lost of quality either ! That's perfect for me because often enhancers make the image looking not as good as the original