PromptBase

Pricing model
Paid
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PromptBase is a platform providing a marketplace where users can discover and sell prompts for use with different AI language models like DALL·E, GPT-3, Midjourney, and Stable Diffusion. Users can explore and buy prompts tailored to generate particular content or images, such as psychedelic illustrations, business name suggestions, or fantasy game asset designs. Additionally, PromptBase enables users to hire creators for bespoke prompt creation.

Similar neural networks:

Free
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An extensive and expanding collection of free image prompts is available. Avoid purchasing prompts... Access them at no cost. The website also features examples from different models and embeddings.
Free
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writeGPT is a web extension that integrates GPT3.5 features, enabling users to effortlessly generate content, respond to emails, summarize articles, explore and review code, and translate text on any website. It includes a hotkey for quick activation, and users can personalize prompts to achieve optimal results. Currently, the business model is free with limited credits, but a shift to a freemium model is planned for the future.
Paid
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Markprompt is a tool that enables users to effortlessly create a GPT-4 prompt for Markdown documents. It removes the necessity for configuration, hosting, and metrics collection. Supporting Markdown, Markdoc, and MDX files, it is compatible with all OpenAI completion models, including GPT-4. It provides a generous free tier, with the ability to scale according to usage. Additional features include feedback and analytics to identify content weaknesses. The source code can be accessed on GitHub.