If you're looking for an AI-powered image editor with the ability to upscale and otherwise improve images with more advanced features, Let's Enhance is worth a look. It can upscale images to 4K and beyond and offers features like HDR filters for color grading, background removal and batch processing. It's geared for creative pros, eCommerce and real estate, and offers a free trial and flexible pricing.
Another good option is VanceAI, which offers a range of photo enhancement tools. Its main tools are the AI Image Upscaler, AI Image Sharpener and AI Background Remover. VanceAI also can process images in batches and handle larger sizes, so it's good for people with lots of images to process. Pricing is flexible, starting at $4.95 for 100 credits.
If you want a more general-purpose editing tool, check out Clipdrop. It's got background removal, image upscaling and instant text-to-image generation. Clipdrop's interface is designed to be easy to use for pros and amateurs alike. The company also offers an API for those who want to build its AI abilities into their own apps, and there's a free version with lower image resolution and a Pro version for higher resolution.
Topaz Labs has a variety of professional-grade photo editing software using deep learning technology. Its Photo AI 3 and Gigapixel 7 tools are designed to upscale and otherwise improve images, with tools for de-noising and de-blurring. The tools run locally on Mac and Windows and can be used as standalone software or as plugins for other software.