NAI leak-free is one of the models of NovelAI, an image generation AI.
NovelAI is a model that has improved the open source AI model Stable Diffusion to generate high-precision illustrations, but its proprietary data was leaked.
NAI leak-free is a model that has been fine-tuned using the leaked data, and is said to have improved the output of fingers.
This model was created in China, and is not well known in Japan.
NovelAI's model can be run locally, but you need some tools and settings to do so.
There is also a way to avoid the R18 filter.
NovelAI's model is compatible with Stable Diffusion's model, so you can use the same WebUI.
Stable Diffusion has other various image generation models as well.
NovelAI's model is unofficial and may have issues with copyright and security.
Therefore, you need to use it at your own risk.