Leonardo.ai

This is one of my favorite text-to-image generators out there. A free app very similar to the popular Midjourney, this image generator runs on Stable Diffusion Models and creates incredible pictures.

This app is very useful for Game assets, but also any other types of designers and artists as well. You have the ability to not only choose the model that suits your style best, but you can even train your own image model to suit your personal style.

It is currently completely free to use, but does have options to upgrade your subscription where the first level is only $12 a month and enables you to create HUNDREDS of images, among other functionalities. Leonardo is currently available on Discord, but they do have a web app to which they give batch access that you can apply for.