If you're looking for a replacement for Nack, getimg.ai is a good option. It's a full-featured suite of AI image generation and editing tools. Among its features are an AI Generator for creating images from text prompts, Image to Video conversion, and support for more than 80 community-trained AI models. It's good for a variety of creative tasks, and flexible pricing means it can accommodate different users.
Another option is Image App, which marries several AI image generation technologies and offers AI chat. It can use up to 30 models and styles for image generation, and includes tools like FaceTune for portrait photos and AI Photobooth for selfies. It also lets you train your own models, so it's good for enthusiasts and businesses.
If you want a free, standalone tool, DiffusionBee is worth a look. This app uses Stable Diffusion to generate AI art on your own machine, so it doesn't send your data to the cloud. It's got a variety of creative AI tools, including text-to-image generation, image upsampling and training your own model, so it's a good offline option.
Last, Enhance AI is an all-in-one tool for generating and enhancing images from text prompts. It's got features like image upscaling, custom styles and commercial use. It's got a simple interface and a variety of pricing tiers, so Enhance AI is good for beginners and experienced users trying to automate their image generation and editing.