If you want an AI image generator with a free tier for personal use and more expensive pricing tiers for commercial use, Leonardo is a good option. The service has a free tier with a daily token limit, good for personal projects. For commercial use, it offers paid subscriptions with higher token limits, faster image generation and premium features, so you can pick the tier that works best for you.
Another good option is Facet, which has a free Starter tier and several paid tiers, including Professional and Organization tiers. This browser-based service gives you more creative control with spatial prompts and auto-enhanced image prompts, so it's good for pros who want to generate images and then edit them collaboratively.
Stablecog is a free, open-source service that uses Stable Diffusion and Kandinsky models. It has a variety of pricing tiers, including a free option, good for artists and designers who want to generate and refine images rapidly. The service is available for commercial use with paid tiers, so you can pick the tier that works best for you.