OneDiffusion is described as 'Open-source one-stop shop for facilitating the deployment of any diffusion models in production. It caters specifically to the needs of diffusion models, supporting both pretrained and fine-tuned diffusion models with LoRA adapters' and is an app. There are more than 50 alternatives to OneDiffusion for a variety of platforms, including Web-based, iPhone, Android, iPad and Mac apps. The best OneDiffusion alternative is Midjourney. It's not free, so if you're looking for a free alternative, you could try Qwen Image or FLUX.2. Other great apps like OneDiffusion are DALL-E 3, Craiyon, Stable Diffusion and Janus.