One of the best is ImageColorizer, a cloud-based service that uses machine learning technology to restore and improve historical photos. It's got a range of tools, including Colorize, Restore Photos and AI Enhance, that can add color to black and white photos, upscale faces and details, and improve overall image quality. ImageColorizer also offers a free plan with 20 credits per month, so you can try it out without breaking the bank.
Another good option is PicMa, an AI-powered tool with a range of options to improve photo quality and resolution. Its Color Master option is geared specifically for colorizing black and white photos, with good results. PicMa is easy to use and supports a variety of file formats, so it should be good for both casual and serious photographers.
If you're looking for a simple, AI-based option, Restore Photos could be the way to go. The service is geared for restoring old black and white photos, with options like AI-based colorization, old photo restoration and high-definition face retouching. It's designed to be easy to use and accessible even if you're not a techie.