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OnlyPrompts is a huge library of over 150,000 ready-made prompts designed to work with multiple large language models. Instead of writing prompts from scratch, you browse categories like marketing, finance, data analysis, customer service, and more, then pick one that fits your task. You can test prompts directly on the platform using the built-in AI Assistant, which lets you switch between models like GPT-4 and Claude 3 Sonnet or Haiku. It's basically a prompt marketplace plus a multi-model chat interface rolled into one.

The workflow is straightforward: explore the prompt library, find a template, tweak it using the config toolbox, and run it side-by-side with other prompts to compare outputs. You can save your favorites and reuse them later. OnlyPrompts highlights that it can automate over 37,000 tasks and claims an 83% time saving for users. The platform is regularly updated with new prompts, and it supports both simple and advanced prompts — the advanced ones include placeholders you fill in with your specific details.

This tool is best for professionals who frequently use AI assistants (ChatGPT, Claude) but want to skip the prompt engineering grind. Marketing teams can grab copywriting prompts, data analysts can use pre-built analysis prompts, and HR folks can find interview question templates. It's also useful for teams that want to standardize prompts across their organization. If you're already comfortable writing your own prompts, you might not need it, but for anyone who wants a huge head start, OnlyPrompts saves time and reduces guesswork.