As of my last update in October 2023, several AI image generators fit your criteria of being free, fast, and offering different styles without the need for credits. Here are a few options:
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Craiyon (formerly DALL-E Mini): This is a lightweight version of DALL-E that allows for quick image generation from text prompts. It's free and doesn't require credits.
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DeepAI: DeepAI offers a variety of AI tools, including an image generator that can create images based on text prompts. It allows you to choose from different styles and is quick to use.
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Artbreeder: While not strictly an image generator from text, Artbreeder allows you to blend images and modify them based on various parameters. It provides various styles and is free to use without requiring credits.
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NightCafe Studio: NightCafe offers various styles and algorithms for generating images. While it has a credit system for certain features, you can use it for free with some limitations.
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Fotor: Fotor's AI image generator is user-friendly, allowing you to create images based on prompts. Different styles are available, and it is generally fast.
Always check the latest features and terms, as tools and policies may have changed since my last update.