Smart Upscaler is described as 'AI upscaling with a great interface. Upload a photo, download a photo. Upload a batch, download a batch. Best in class for vector images, up to the level with photos. Resolution is limited to 3000x3000 as of November 2020' and is a Image Upscaling App in the Photos & Graphics category. There are more than 25 alternatives to Smart Upscaler, not only websites but also apps for a variety of platforms, including Windows, Mac, SaaS and Android. The best alternative is waifu2x, which is both free and Open Source. Other great sites and apps similar to Smart Upscaler are Gigapixel AI (Paid), Waifu2x Caffe (Free, Open Source), Bigjpg (Free) and Let's Enhance (Freemium).
Gigapixel AI helps you do a single thing very well: increase image resolution in a natural way. This is pretty hard to do. Most upscaling algorithms don’t know how to accurately fill in missing pixels, so you end up with blocky low-quality results.
Waifu2x Caffe rewrites only the conversion function of the image conversion software "waifu2x" using Caffe and is software developed for Windows. Although it can convert with CPU, using CUDA (or cuDNN) can convert faster than CPU.
Powered by AI image upscaling technology, Super Photo Upscaler is an image enhancer which intelligently enlarges photos from low-resolution to high-resolution while maintaining clean edges without losing quality.