For artists and designers trying to stand out with their imagery, Perception is a good option with research-based color palette suggestions and AI-based palettes. The color palette generator on the site produces nice palettes on the fly, and you can get three basic palettes for free without signing up. The Perception Studio plan is $14 per month or $10.80 per month if you pay annually, so it's not too bad if you use it a lot.
Khroma is another good option for creating your own palettes. It uses an AI algorithm to create color combinations based on your preferences and can learn from your likes and dislikes. With hue, tint and value search and filter options and a collection system to store your favorite palettes, Khroma is good for finding and storing palettes you like.
Huemint offers a machine learning-based color palette generator good for creating custom and unusual color schemes for a variety of projects. It offers a variety of generation options, from basic to advanced palettes, and you can upload images to generate palettes. It's good for designers and marketers trying to improve their brand identity without a lot of guesswork.
If you just need a simple tool to generate and tweak palettes, AI Colors is a good option. It's got palette generation, editing and visualization tools so you can create palettes that look good and are personalized. It's good for designers and artists who want to let the computer do the heavy lifting.