ImageColorizer is a cloud-based service that uses machine learning technology to restore and improve historical photos. It's got a dedicated tool for colorizing black and white photos, but also can upscale photos, improve detail and remove scratches. ImageColorizer has a web interface and 24/7 email support, and a 14-day money-back guarantee.
Another option is Colorize, an AI-powered service to keep your family memories in color. It can colorize 4K photos, colorize video, reduce noise and improve faces. Colorize offers different pricing plans for individuals and professionals, so it's a good option if you want to colorize lots of photos and videos.
For a free service, Restore Photos is an AI-powered system to turn old black and white photos into full-color shots. It also can retouch faces in high-resolution to improve portrait photos. It's easy to use and doesn't require any technical expertise, so it's a good option if you want to freshen up your old photos.
Last, PicMa has a suite of AI-powered tools for photo editing, including Color Master for colorizing black and white photos. It also has Descratch to remove creases and scratches, and AI Eraser to remove objects in the background. PicMa is designed to produce high-quality results, and is good for both amateur and serious photographers.