If you're looking for another OpenArt alternative, you might want to check out getimg.ai. It's a full-featured AI image creation and editing platform with an AI Generator for text-to-image prompts, Image to Video conversion, Real-Time AI Generator, and DreamBooth for training your own AI models. The service can generate high-resolution images and offers a variety of community-trained AI models for different tasks, so it's good for art and other uses.
Another option is DreamStudio, an online tool that uses AI to create art, photos and illustrations. It can handle multi-image editing, inpainting and outpainting, and you can use the latest StableDiffusion models. DreamStudio also can perform multi-generation exploration and instant style transfer, so it's good for people who want to work faster and explore more image generation options.
If you want something a bit more basic but still accessible, you might like starryai. It's got a simple interface, and you can generate up to 25 images a day for free. It's got a big library of styles and lots of options for customizing them. The app also can re-create existing images, and it's got a powerful API for developers. It's good for casual users and pros who want to experiment with AI art.
Last, Exactly is geared for pros who want to train their own AI models with their own work. It can generate high-resolution images, and it's designed to be used responsibly to augment human creativity, not replace it. It's good for art directors, designers and freelance illustrators who want to generate inspiring images but still have control over their work.